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Zinc and manganese sorption behavior by natural zeolite and bentonite Texto completo
2011
Iskander, A.L. | Khald, E.M. | Sheta, A.S.
Zinc and manganese sorption behavior by natural zeolite and bentonite
2011
Iskander, A.L. | Khald, E.M. | Sheta, A.S.
Understanding the sorption process in natural zeolite and bentonite is necessary for effective utilization of these minerals as nutrient adsorbents and on the other side for controlling release of plant nutrients. This research was undertaken to characterize the ability of natural zeolite and bentonite minerals to adsorb and release zinc and manganese. The potentials for sorption of these ions were evaluated by applying the Langmuir and Freundlich equations. The results showed that Langmuir constant (maximum adsorption (b mmol kg-1)) of both Zn and Mn were for bentonite zeolite While the [binding strength values (k in L.mmol1 for zeolite bentonite Zn in case of zeolite showed the lowest desorbed percentage particularly at high levels of sorbed Zn. Only, 74.7 % is readily extractable by DTPA after three successive extractions leaving, 25.3 % Zn retained by the mineral. In case of bentonite, 82.26 % of sorbed Zn is readily extractable by DTPA after three successive extractions leaving, 17.74 % Zn retained by the mineral. In case of Mn, 84.63% of Mn sorbed by zeolite is readily extractable by DTPA after three successive extractions leaving, 15.37% Mn retained by the mineral. In case of bentonite, 89.79 % of adsorbed Mn is readily extractable by DTPA after three successive extractions leaving, 10.21 % Mn retained by the mineral. This finding may reflect clearly the possibility of using natural zeolite and bentonite as a slow release fertilizer for Zn and Mn and on the other hand preventing soil pollution with heavy metals.
Mostrar más [+] Menos [-]Zinc and manganese sorption behavior by natural zeolite and bentonite Texto completo
2011
A.L. Iskander | E.M. Khald | A.S. Sheta
Understanding the sorption process in natural zeolite and bentonite is necessary for effective utilization of these minerals as nutrient adsorbents and on the other side for controlling release of plant nutrients. This research was undertaken to characterize the ability of natural zeolite and bentonite minerals to adsorb and release zinc and manganese. The potentials for sorption of these ions were evaluated by applying the Langmuir and Freundlich equations. The results showed that Langmuir constant [maximum adsorption (b mmol kg−1)] of both Zn and Mn were for bentonite > zeolite. While the binding strength values (k in L mmol−1) for zeolite > bentonite. Zn in the case of zeolite showed the lowest desorbed percentage particularly at high levels of sorbed Zn. Only, 74.7% is readily extractable by DTPA after three successive extractions leaving, 25.3% Zn retained by the mineral. In the case of bentonite, 82.26% of sorbed Zn is readily extractable by DTPA after three successive extractions leaving, 17.74% Zn retained by the mineral. In the case of Mn, 84.63% of Mn sorbed by zeolite is readily extractable by DTPA after three successive extractions leaving, 15.37% Mn retained by the mineral. In the case of bentonite, 89.79% of adsorbed Mn is readily extractable by DTPA after three successive extractions leaving, 10.21% Mn retained by the mineral. This finding may reflect clearly the possibility of using natural zeolite and bentonite as slow release fertilizers for Zn and Mn and on the other hand preventing soil pollution with heavy metals.
Mostrar más [+] Menos [-]ESTIMATION OF THE QUALITY INDICATORS IN THE IRRIGATED SOIL WITH INDUSTRIAL WASTEWATER IN ALMARAWEA’AH–HOUDIDAH - REPUBLIC OF YEMEN Texto completo
2016
AL-Mansori Q.S. | Othman M. | AL-Wadeai M.
In a comprehensive study, soil surface (0-60cm) and subsurface (60-120cm) samples, (industrial- wastewater and wells water samples beside of plant samples (forest and wild shrubs) were collected from Almarawea’ah area, Al-houdiadah governorate. The objective of the study was to evaluate the environmental impact of wastewater that flow from food factory. The water is used for irrigating a silty loam soil and plants grown thereon which were evergreen trees (wind breaks) since 25 and 5 years ago (the first and second stages, respectively). Also, the analysis of chemical, physical, biological and microbial indicators was done. Obtained results showed that soil salinity was increased three times but sodium adsorption was increased 10 times as a result of using wastewater for irrigating the evergreen trees since 15 years ago where the EC and SAR were 0.115mS\cm and 1.3, respectively in the non-treated soil as compared with the treated one which were 0.37 mS\cm and 12.5 for EC and SAR, respectively. There was no significant impact for soil depth 0-60 and 60-120cm as well as for years of applications (5 and 25 years) on all the evaluated properties. However, organic matter, nitrogen, phosphorus, and iron contents in treated soil were slightly increased with no significant differences. On the contrary, potassium and manganese were significantly increased at 0.05 level as compared to non-treated one. Regarding to the plant analysis the obtained data showed that no significant differences between the concentration of the studied elements (N, P, K, Fe, and Mn) in leaves of trees (their local names are Muraimerah and Damas) and shrubs (Thomam and Abad). However, zinc concentration was high in shrub plants (2350.5 ppm) compared to trees (103.5 ppm) which indicated that shrub plants can collecte high levels of zinc ( zinc hyperaccumulatorplant). For water, comparison of samples collected from ground water wells (near and far) and wastewater samples collected morning and evening, the results indicated that using factory wastewater for irrigating trees to be used as wind breaks was suitable way to prevent expected environmental contamination and transmission of those contaminants to the ground water
Mostrar más [+] Menos [-]Field evaluation of Imidacloprid applied as seed treatment to control Thrips tabaci lind on cotton with regard to soil pollution
1999
El-Hamadi, S.E.E. (Tanta Univ., Kafr-El-Sheikh (Egypt). Faculty of Agriculture) | Abou-Sholoa, M.K.A.
