The objective of this research work was to study the perceptions of the population about the drinking water service in two AAHH of the Punchana district of the province of Maynas in 2021. The research, due to its approach, was quantitative, prospective, descriptive level simple and non-experimental research design. The target population of the study consisted of (450 dwellings or heads of families) with a minimum of two years of experience and with housing in the place. The sample also consisted of 65 heads of families distributed in 34 heads of families of AAHH Versalles and 31 heads of families of AAHH Masusa, who were present at the time of application of the data collection instrument, criteria were taken into account. of inclusion and exclusion, the technique that was used was the survey and the measurement instrument applied was the questionnaire of thirteen questions, the same one that passed the tests of validity (Aiken's validity index) and reliability (test of the two halves). The data obtained through the data collection instrument was analyzed taking into account the objectives and the research hypothesis and later expressed in a Basic Data Matrix (MBD) and analyzed and tabulated through the statistical package SPSS version 23. The main The results expressed that, regarding the service in the homes and storage of drinking water in both AAHH, this is done mostly of the public service and stores it in buckets or drums (52.9%) and (71%), the scarcity of water is the main problem (55.9% and 51.2%) since its frequency is mostly every three days (55.9% and 77.4 %), the type of water for consumption by the population in both AAHH is preferably boiled (50% and 58.1%), the quality of water consumed by the population was mostly of poor quality (61.8% and 71%), monthly water consumption in both varies from 40 to 60 soles mostly (50% and 51.6%), there is presence of diseases in all family members and in children under 12 years (52.9% and 58.1%) and 79.4% and 77.4% of the residents of both AAHH said they agreed with the installation of drinking water meters. The research hypothesis assumed in this investigation does not agree with the results obtained in this work. | El presente trabajo de investigación tuvo como objetivo estudiar las percepciones del poblador sobre el servicio de agua potable en dos AAHH del distrito de Punchana de la provincia de Maynas en el 2021. La investigación, por su enfoque, fue cuantitativa, prospectiva, de nivel descriptivo simple y de diseño de investigación no experimental. La población objetivo de estudio estuvo constituida por (450 viviendas o jefes de familia) con mínimo de dos años de vivencia y con vivienda en el lugar. La muestra igualmente estuvo constituida por 65 jefes de familia distribuidos en 34 jefes de familia del AA. HH. Versalles y 31 jefes de familia del AA. HH. Masusa , los cuales, estuvieron presentes al momento de la aplicación del instrumento de recolección de datos, se tuvo en cuenta criterios de inclusión y exclusión, la técnica que se utilizo fue la encuesta y el instrumento de medición aplicado fue el cuestionario de trece preguntas el mismo que paso las pruebas de validez (índice validez de Aiken) y confiabilidad (prueba de las dos mitades ).Los datos obtenidos a través del instrumento de recolección de datos, fue analizada teniendo en cuenta los objetivos y la hipótesis de investigación y posteriormente expresados en una Matriz Básica De Datos (MBD) y analizada y tabulada a través del paquete estadístico SPSS versión 23. Los principales resultados expresaron que, en cuanto al servicio en las viviendas y almacenamiento de agua potable en ambos AA. HH., esto se realiza mayoritariamente del servicio público y lo almacena en baldes o bidones (52.9%) y (71%), la escases del agua es el principal problema (55.9% y 51.2%) toda vez que su frecuencia mayoritariamente es cada tres días (55.9% y 77.4%),el tipo de agua para el consumo del poblador en ambos AAHH esta es preferentemente hervida (50% y 58.1%),la calidad de agua que consume el poblador opinaron mayoritariamente que es de mala calidad (61.8% y 71%), el consumo mensual de agua en los dos varia de 40 a 60 soles mayoritariamente (50% y 51.6%), existe presencia de enfermedades en todos los miembros de la familia y en menores de 12 años (52.9% y 58.1%) y l 79.4% y el 77.4% de los moradores de ambos AA. HH. dijeron estar de acuerdo con la instalación de medidores de agua potable. La hipótesis de investigación asumida en la presente investigación no concuerda con los resultados obtenidos en el presente trabajo.

Lagos e lagunas são ambientes aquáticos com alta produtividade, abrigando biodiversidade e provendo outros importantes serviços ecossistêmicos. Suas características os tornaram importantes sítios de ocupação humana, podendo ser bastante afetados por atividades antropogênicos, além de variação climática. O sensoriamento remoto é uma excelente ferramenta para fornecer dados espacializados que melhorem o entendimento dos impactos destas variações climáticas e não-climáticas nestes ecossistemas. Este trabalho buscou compreender como mudanças ambientais afetam a variação espaço-temporal de parâmetros de qualidade da água de lagos rasos costeiros brasileiros, para isto validando dados de sensoriamento remoto. A primeira parte avaliou os padrões de variação do fitoplâncton num complexo de lagunas tropicais rasas utilizando imagens Sentinel-2 MSI. Primeiramente, foi validado um conjunto de correção atmosférica e algoritmo de clorofila-a (chla) para todo o complexo, com a combinação do ACOLITE com um modelo semi-analítico de razão de bandas do vermelho e infravermelho próximo se mostrando a mais robusta para as duas lagunas. A partir disso, foi avaliada a série espaço-temporal de chla junto com o coeficiente de absorção por matéria orgânica dissolvida colorida (CDOM). Se observou que a Manguaba é mais eutrófica do que a Mundaú e afetada principalmente pela afluência de nutrientes da bacia hidrográfica, enquanto que a Mundaú mostrou um padrão de variação mais definido, também afetada pela precipitação e vazão dos rios. Durante a estação chuvosa, a afluência dos rios geralmente reduz a chla devido à limitação da luz por CDOM, e aumenta em outros pontos devido a lançamentos de esgoto e águas pluviais. A análise mostrou a importância da hidrodinâmica no sistema, destacando zonas de recicurlação na laguna Manguaba, a influência do ciclo da cana, e das marés na renovação ou retenção da água no sistema. A segunda parte avaliou o impacto da variação climática na temperatura superficial de um conjunto de lagoas subtropicais costeiras rasas utilizando o sensor MODIS. Primeiramente, foram validados algoritmos de correção de efeito de superfície, verificando-se redução do viés e melhoria de todas as métricas pelos modelos testados. Comparando os resultados sem a correção do efeito, se observou diferença principalmente nos cálculos das tendências de aquecimento das lagoas e de evaporação da água. A análise da série temporal mostrou que os impactos nestas lagoas são uma alta taxa de aquecimento regional na primavera e em menor escala de aquecimento no verão, com concordância com as tendências de temperatura do ar na região. O aquecimento na primavera se deve principalmente à uma antecipação do fim do inverno e início da primavera, e rápida resposta das lagoas rasas. Também se observou uma geral homogeneidade espacial nas tendências de aquecimento, porém com diferenças nas áreas de afluência dos rios tributários. | Lakes and lagoons are highly productive aquatic environments, harbouring biodiversity and providing other important ecosystem services. Their characteristics make them important sites of human occupation, and they can be highly affected by anthropogenic activities, in addition to climatic variability. Remote sensing is an excellent tool to provide spatialized data to improve the understanding of the impacts of these climatic and non-climatic variations in these ecosystems. This thesis sought to understand how environmental changes affect the spatiotemporal variability of water quality parameters of Brazilian coastal shallow lakes, validating remote sensing data for this purpose. The first part evaluated the spatiotemporal variation patterns of phytoplankton in a shallow tropical lagoon complex using Sentinel-2 MSI imagery. First, a set of atmospheric correction and chlorophyll-a (chla) algorithm was validated for the entire complex, with the combination of ACOLITE with a semi-analytical model using red and near infrared band ratio showing more consistency for the two lagoons. With this set validated, we assessed spatiotemporal series of chla along with the coloured dissolved organic matter (CDOM) absorption coefficient. Manguaba is more eutrophic than Mundaú and is mainly affected by the inflow of nutrients from the watershed, while Mundaú showed a more defined pattern of variation, which is also affected by precipitation and river flows. During the rainy season the rivers’ inflow generally causes a reduction in chla due to light limitation by CDOM, while increasing in other parts due to the effect of sewage and stormwater discharges. The analysis showed the importance of hydrodynamics and residence times in the system, highlighting areas of recirculation in Manguaba lagoon, the influence of the sugarcane cycle, and of the tides in the renewal or retention of water in the system. The second part assessed the impact of climate variability on the surface temperature of a set of subtropical shallow coastal lakes using MODIS imagery. First, we validated algorithms to correct for a surface effect, and we verified reduced bias and improvement of all metrics by the models. Comparing the results without correction for the effect, we observed differences mainly in the calculation of the lakes’ warming trends and of water evaporation. The analysis of the time series showed that the impacts on these lakes are a high regional warming rate observed in spring and to a lesser extent warming in summer, with agreement with air temperature trends in the region. The warming in spring is mainly due to the anticipatation of the end of winter and beginning of spring, and quick response of the shallow lakes. We also observed a general homogeneity in the warming trends, but with differences in the tributary rivers’ inflow areas.

O emprego crescente de agrotóxicos em atividades agrícolas gera preocupação quanto à presença desses compostos nos mananciais. Se forem detectados nas captações, possivelmente estarão presentes nos sistemas de distribuição de água tratada. Os processos de tratamento de água da maioria das cidades brasileiras têm limitada capacidade de remover agrotóxicos. Um dos instrumentos para avaliar se há contaminação e promover políticas públicas voltadas à preservação da saúde humana é o monitoramento da qualidade das águas. Contudo, o monitoramento representativo dos agrotóxicos é um desafio. A presença de agrotóxicos nos mananciais é influenciada por diversos fatores, tais como a precipitação, a umidade do solo, as características químicas dos compostos e o grau de antropização da bacia hidrográfica. Outro desafio é estabelecer o período adequado para a coleta das amostras, dada à complexidade do comportamento dos agrotóxicos no meio ambiente. A maioria dos países desenvolvidos controla regularmente os principais agrotóxicos. As diretivas internacionais planejam o monitoramento, avaliando se já houve detecção na água, qual o comportamento ambiental dos ingredientes ativos e quais os riscos para a saúde humana e o meio ambiente. A frequência adotada em função destes critérios não é uniforme para os diferentes compostos. A Portaria n.º 888/2021, que regulamenta a qualidade da água no Brasil, define uma frequência semestral para 40 agrotóxicos, que deve ser aplicada a todos os sistemas de abastecimento de água. Porém, a base de dados do Sistema de Informação de Vigilância da Qualidade da Água para Consumo Humano – SISÁGUA do Ministério da Saúde demonstra que esta exigência não é atendida. Também, observa-se uma baixa frequência de detecção de agrotóxicos na água, considerando o seu elevado consumo no Brasil. Para fundamentar esta avaliação foram identificados os locais que empregam os ingredientes ativos mais comercializados no país. Constataram-se diferenças significativas nas classes e quantidades utilizadas entre os Estados. A partir dessas verificações foi desenvolvido um método de monitoramento escalonado para elaboração de planos de monitoramento de agrotóxicos. A metodologia emprega a análise multicritério para selecionar um conjunto de municípios cujos sistemas de abastecimento de água serão monitorados, conforme uma distribuição mensal escalonada, ao longo dos dois semestres do ano. Dessa maneira, é possível obter 12 amostras por parâmetro neste período. Após as avaliações iniciais, são elaboradas recomendações para dar prioridade aos agrotóxicos que devem permanecer no programa de monitoramento, bem como às frequências das coletas. Além de otimizar custos, essas avaliações anuais permitem que os formuladores de políticas estabeleçam as melhores ações para minimizar a presença de agrotóxicos em águas destinadas ao consumo humano. | The increasing use of pesticides in agricultural activities rises concerns about the presence of these compounds in water sources. If they are detected in catchments, they will possibly be present in treated water distribution systems. Water treatment processes that are used in most Brazilian cities have limited capacity to remove pesticides. One of the instruments for evaluating contamination and promoting public policies aimed at preserving public health is monitoring water quality. However, representative monitoring of pesticides is a challenge. The presence of pesticides in water sources is influenced by several factors, such as precipitation, soil moisture, the chemical characteristics of the compounds and the degree of anthropization of the river basin. Another challenge is to establish the appropriate period for collecting samples, given the complexity of the behavior of pesticides in the environment. Most developed countries regularly control major pesticides in water. International guidelines plan monitoring assessing whether there has already been detection in the water, the environmental behavior of the active ingredients and the risks to human health and the environment. The frequency adopted based on these criteria is not uniform for different compounds. Ordinance No. 888/2021, which regulates water quality in Brazil, defines a biannual frequency for 40 pesticides, which must be applied to all water supply systems. However, the database Surveillance Information System for Drinking Water Quality – SISAGUA from the Health Minister shows that this requirement is not met. Also, it is observed a low detection level of pesticides in water considering their high consumption in Brazil analyzes present limited results and a low detection rate, given the high consumption of pesticides in Brazil. To support this analysis, the locations that use the most commercialized active ingredients in the country were identified. Significant differences were found in the classes and quantities used between the States. Based on these analyses, a staggered monitoring method was developed to prepare pesticide monitoring plans. The methodology uses multi-criteria analysis to select a set of municipalities whose water supply systems will be monitored according to a staggered monthly distribution, throughout the two semesters of the year. In this way, it is possible to obtain 12 samples per parameter in this period. After initial assessments, recommendations are drawn up to prioritize pesticides that should remain in the monitoring program, as well as collection frequencies. In addition to optimizing costs, these annual assessments allow policymakers to establish the best actions to minimize the presence of pesticides in water intended for human consumption.

Relación entre la calidad del agua para consumo humano y el plan de actividades sanitarias a nivel domiciliario. Sector Azungue, Moyobamba, 2021 La salud pública depende del agua limpia y de fácil acceso. Mejorar el suministro de agua, el saneamiento y la gestión de recursos es una tarea que se ha convertido en un reto para los gobiernos, dado que estos servicios deben estar disponibles siempre que se necesiten y libres de agentes contaminantes que pongan en riesgo la salud de los usuarios. En este sentido, surgió la presente investigación con el objetivo aplicar un plan de actividades sanitarias para mejorar el conocimiento sobre calidad del agua para consumo humano en el sector Azungue, el mismo que se desarrolló de diciembre del 2020 a agosto del 2021. Se trabajó bajo un diseño preexperimental y con una muestra aleatoria de 20 familias a quienes se les administró una preprueba y posprueba de conocimientos sobre agua potable. Para determinar la calidad del agua se evaluaron los parámetros físicos, químicos y biológicos, concluyendo que, respecto a los parámetros físicos, al iniciar la investigación, tanto la turbiedad como el color superaron los límites máximos permisibles, mientras que la conductividad y los sólidos totales disueltos estaban dentro de los límites máximos permisibles. Después de las actividades sanitarias todos los parámetros físicos estaban dentro de los límites máximos permisibles. Todos los parámetros químicos estaban dentro de los límites permisibles, salvo el aluminio que al inicio se encontraba afuera de dichos límites. En los parámetros biológicos tanto al iniciar como al finalizar la investigación, los coliformes totales y termotolerantes sobrepasaban los límites máximos permisibles, por lo que se concluye que el agua que consumen las familias en el sector Azungue no es apta para el consumo humano. Asimismo, se obtuvieron avances significativos en cuanto al conocimiento sobre contaminación del agua y su tratamiento desde la recolección hasta el consumo por parte de las familias. En este sentido, las capacitaciones están relacionadas con los conocimientos que adquirieron los pobladores. | Relationship between the drinking water quality and the sanitary activities plan at household level. Azungue Sector, Moyobamba, 2021 Public health depends on clean and easily accessible water. Improving water supply, sanitation and resource management is a task that has become a challenge for governments, since these services must be available whenever they are needed and free of contaminants that put users' health at risk. For this reason, the present research was developed with the objective of applying a plan of sanitary activities to improve knowledge about the quality of water for human consumption in the Azungue sector, which was carried out from December 2020 to August 2021. The study was conducted under a pre-experimental design with a random sample of 20 families who were administered a pre-test and post-test of knowledge about drinking water. To determine water quality, physical, chemical and biological parameters were evaluated, concluding that, with respect to physical parameters, at the beginning of the investigation, both turbidity and color exceeded the maximum permissible limits, while conductivity and total dissolved solids were within the maximum permissible limits. After the sanitation activities, all physical parameters were within the maximum permissible limits and all chemical parameters were within the permissible limits, except for aluminum, which was outside these limits at the beginning. In terms of biological parameters, both at the beginning and at the end of the investigation, total and thermotolerant coliforms exceeded the maximum permissible limits, which leads to the conclusion that the water consumed by families in the Azungue sector is not suitable for human consumption. Significant progress was also made in terms of knowledge about water contamination and its treatment from collection to consumption by families. In this sense, the training is related to the knowledge acquired by the villagers.

Las estrategias para disminuir el consumo de agua en el cultivo del arroz son un factor clave para enfrentar la escasez del recurso hídrico en la agricultura y asegurar las sostenibilidad del cultivo. El objetivo de este estudio fue evaluar el efecto del riego intermitente en los componentes de rendimiento y manejo de agua usando once genotipos de arroz. Los componentes de rendimiento, características agronómicas y manejo de agua fueron comparados entre el sistema de riego intermitente y el riego por inundación permanente. Los resultados indican que con el riego intermitente disminuye- ron las panículas por m2, sin afectar el número de granos por panícula y el peso de 1.000 granos, causando una disminución del 30,6% en el rendimiento promedio. Sin embargo, se obtuvo un aumento del 14,2% en el porcentaje de grano entero y un 41% de ahorro de agua, respecto a riego por inundación permanente. Los genotipos con mejor comportamiento fueron el cv. Diamante y Quila 208902, con disminución en rendimiento de 25,45 y 18,03%, respectivamente. La eficiencia de uso del agua fue mayor en riego intermitente, con 0,726 kg m-3nbsp;en relación a 0,523 kg m-3nbsp;del riego por inundación permanente. Se concluyó que el riego intermitente permite disminuir el consumo de agua del arroz y puede ser aplicable en situaciones de escasez hídrica, con genotipos adaptados, sin embargo se requiere más investigación en este tema.

INTRODUCCION: Existen cambios fisiológicos que se producen en las mujeres a partir de los primeros años de posmenopausia. Dentro de la lista, se destacan las alteraciones a nivel de la composición muscular, asociándose con pérdida del tamaño y debilidad muscular. El uso de tamizajes nutricionales y la impedancia eléctrica son métodos no invasivos que se utilizan para la valoración del estado nutricional y composición corporal. En estudios anteriores se propuso la relación AIC/MM como predictor de la calidad muscular, y está asociado independientemente con el estado nutricional en las mujeres posmenopáusicas. METODO: Estudio descriptivo, retrospectivo de corte transversal, con muestreo aleatorio, realizado con un total de 175 mujeres posmenopáusicas con una edad media de 72,34 ± 12,26 años que viven independientemente participaron del estudio. La ratio AIC/MM se calculó con el equipo de impedancia eléctrica, y el riesgo nutricional se estimó con el screening MNA. RESULTADOS: Solamente el 24,5% de las participantes (n=42) presentaron riesgo nutricional asociado con bajo peso, IMC, masa magra, masa muscular apendicular (p<0.05). La disminución de AIC/MM mostró correlación significativa con el riesgo nutricional (p<0.05). CONCLUSION: Este estudio propone que la AIC/MM puede ser una herramienta válida para estimar cambios en el estado nutricional en mujeres posmenopáusicas. Y la disminución del contenido de AIC de la MM puede usarse como indicador de la calidad muscular, tanto funcional como estructural. | INTRODUCTION: There are physiological changes that occur in women from the early postmenopausal years. Among the list, alterations at the level of muscle composition stand out, associated with loss of muscle size and weakness. The use of nutritional screening and electrical impedance are non-invasive methods used for the assessment of nutritional status and body composition. Previous studies have proposed the AIC/MM ratio as a predictor of muscle quality, and it is independently associated with nutritional status in postmenopausal women. METHOD: Descriptive, retrospective, cross-sectional, randomly sampled, descriptive study conducted with a total of 175 postmenopausal women with a mean age of 72.34 ± 12.26 years living independently participated in the study. The AIC/MM ratio was calculated with electrical impedance equipment, and nutritional risk was estimated with MNA screening. RESULTS: Only 24.5% of participants (n=42) presented nutritional risk associated with low weight, BMI, lean mass, appendicular muscle mass (p<0.05). The decrease in AIC/MM showed significant correlation with nutritional risk (p<0.05). CONCLUSION: This study proposes that AIC/MM can be a valid to ol to estimate changes in nutritional status in postmenopausal women. And the decrease in AIC content of MM can be used as an indicator of muscle quality, both functional and structural.

La agricultura es la principal actividad económica de las comunidades que integran la parte alta de la cuenca del río San Pedro-Mezquital. Por tal razón, el presente trabajo se enfoca en analizar la calidad del agua que se utiliza para riego agrícola mediante la observación de macroinvertebrados acuáticos, ya que son excelentes indicadores de dicho atributo y una alternativa importante para evaluar cuerpos de agua con vertido de actividades agrícolas. En la primera zona muestreada, en el río Nombre de Dios, se realizaron cuatro muestreos y se encontraron ocho órdenes, 12 familias y una calidad de agua media en su cauce. Para la segunda zona muestreada, en el río Graseros, se llevaron a cabo cuatro muestreos y se hallaron siete órdenes y 18 familias, con una calidad del agua alta en su cauce. En la tercera zona muestreada, en el río La Constancia, se hicieron seis muestreos, para los cuales se reportaron 11 órdenes y 23 familias, con una calidad del agua alta en su cauce. Los datos recabados servirán para generar un registro de las familias de macroinvertebrados y de la calidad del agua que hay en cada una de las zonas agrícolas muestreadas en la parte alta de la cuenca del río San Pedro-Mezquital.

Inorganic nitrogen, phosphorus, pH and conductivity in rainwater were measured at Corrientes (27°27’S, 58°47’W) during 1984-1985. Mean water pH was 5.97 (4.60 -&nbsp;7.15) and mean conductivity was 11.5 uS/cm (2.7 - 21 uS/cm) showing good waterquality. Concentration showed positive correlation with the length of time betweensuccessive rains and were inversely correlated with precipitation volume. Both inorganic nitrogen concentrations and fallout, were low (mean conc.: 315 µg Ninorg/1 mean fallout: 190 µg Ninorg/m2 yr) when compared with the reported figures in unpolluted locations. Total phosphorus concentration (36 µg TP/1) and fallout (16.5 µg TP/m2 yr) were relatively high probably because of dust contribution. Fallout rates resulted an order of magnitude lower than those of very polluted areas.lt was shown that nutrient fallout is important in determining trophic status of shallow lakes and ponds profuselly distributed in Corrientes province. | Inorganic nitrogen, phosphorus, pH and conductivity in rainwater were measured at Corrientes (27°27’S, 58°47’W) during 1984-1985. Mean water pH was 5.97 (4.60 -&nbsp;7.15) and mean conductivity was 11.5 uS/cm (2.7 - 21 uS/cm) showing good waterquality. Concentration showed positive correlation with the length of time betweensuccessive rains and were inversely correlated with precipitation volume. Both inorganic nitrogen concentrations and fallout, were low (mean conc.: 315 µg Ninorg/1 mean fallout: 190 µg Ninorg/m2 yr) when compared with the reported figures in unpolluted locations. Total phosphorus concentration (36 µg TP/1) and fallout (16.5 µg TP/m2 yr) were relatively high probably because of dust contribution. Fallout rates resulted an order of magnitude lower than those of very polluted areas.lt was shown that nutrient fallout is important in determining trophic status of shallow lakes and ponds profuselly distributed in Corrientes province.

Algunos contaminantes de preocupación medioambiental que afectan el agua y se encuentran en concentraciones inferiores a ppb son los contaminantes orgánicos persistentes y los compuestos orgánicos semivolátiles. Este trabajo estudió la presencia de hidrocarburos aromáticos policíclicos, compuestos fenólicos semivolátiles, bifenilos policlorados y plaguicidas organofosforados y organoclorados, en aguas de distinto origen, mediante cromatografía de gases acoplada a espectrometría de masas o un detector de micro captura de electrones. De 956 muestras estudiadas entre los parámetros expuestos solo se registraron valores por encima del límite de cuantificación del método para naftaleno, fenol y la suma de 3-metilfenol y 4-metilfenol en agua residual no doméstica. Se hace evidente la falta de normativa referente a la calidad de vertimientos con estos parámetros. | Some pollutants of environmental concern that affect water and are found at sub-ppb concentrations are persistent organic pollutants and semi-volatile compounds. This work studied the presence of polycyclic aromatic hydrocarbons, semivolatile phenolic compounds, polychlorinated biphenyls, and organophosphorus and organochlorine pesticides, in different origin water, using gas chromatography coupled to a mass spectrometer or an electron microcapture detector. Of 956 samples studied among the exposed parameters, only values ​​above the quantification limit of the method were recorded for naphthalene, phenol, and the sum of 3-methylphenol and 4-methylphenol in non-domestic wastewater. The lack of regulations regarding the quality of discharges with these parameters is clear. | Químico Ambiental | http://www.ustabuca.edu.co/ustabmanga/presentacion | Pregrado