Affiner votre recherche
Résultats 1831-1840 de 61,991
Sampling frequencies for determining long-term average concentrations of atmospheric particulate sulfates [Air pollution].
1977
Tong E.Y. | DePietro S.A.
Airborne investigations of aerosol particles from a paper mill [Air pollution].
1977
Hindman E.E. II | Hobbs P.V. | Radke L.F.
A [mathematical] model for uptake of pollutants by vegetation.
1977
O'Dell R.A. | Taheri M. | Kabel R.L.
The correlation between light scattering and mass concentration of tobacco smoke [Source of air pollution].
1976
Butcher S.S.
Decision support tool for soil sampling of heterogeneous pesticide (chlordecone) pollution
2014
Clostre F. | Lesueur Jannoyer M. | Achard R. | Letourmy P. | Cabidoche Y.M. | Cattan P.
When field pollution is heterogeneous due to localized pesticide application, as is the case of chlordecone (CLD), the mean level of pollution is difficult to assess. Our objective was to design a decision support tool to optimize soil sampling. We analyzed the CLD heterogeneity of soil content at 0-30- and 30-60-cm depth. This was done within and between nine plots (0.4 to 1.8 ha) on andosol and ferralsol. We determined that 20 pooled subsamples per plot were a satisfactory compromise with respect to both cost and accuracy. Globally, CLD content was greater for andosols and the upper soil horizon (0-30 cm). Soil organic carbon cannot account for CLD intra-field variability. Cropping systems and tillage practices influence the CLD content and distribution; that is CLD pollution was higher under intensive banana cropping systems and, while upper soil horizon was more polluted than the lower one with shallow tillage (<40 cm), deeper tillage led to a homogenization and a dilution of the pollution in the soil profile. The decision tool we proposed compiles and organizes these results to better assess CLD soil pollution in terms of sampling depth, distance, and unit at field scale. It accounts for sampling objectives, farming practices (cropping system, tillage), type of soil, and topographical characteristics (slope) to design a relevant sampling plan. This decision support tool is also adaptable to other types of heterogeneous agricultural pollution at field level. (Résumé d'auteur)
Afficher plus [+] Moins [-]Evidence of sulfur-bound reduced copper in bamboo exposed to high silicon and copper concentrations
2014
Collin B. | Doelsch E. | Keller C. | Cazevieille P. | Tella M. | Chaurand P. | Panfili F. | Hazemann J.L. | Meunier J.D.
We examined copper (Cu) absorption, distribution and toxicity and the role of a silicon (Si) supplementation in the bamboo Phyllostachys fastuosa. Bamboos were maintained in hydroponics for 4 months and submitted to two different Cu (1.5 and 100 mm Cu2þ) and Si (0 and 1.1 mM) concentrations. Cu and Si partitioning and Cu speciation were investigated by chemical analysis, microscopic and spectroscopic techniques. Copper was present as Cu(I) and Cu(II) depending on plant parts. Bamboo mainly coped with high Cu exposure by: (i) high Cu sequestration in the root (ii) Cu(II) binding to amino and carboxyl ligands in roots, and (iii) Cu(I) complexation with both organic and inorganic sulfur ligands in stems and leaves. Silicon supplementation decreased the visible damage induced by high Cu exposure and modified Cu speciation in the leaves where a higher proportion of Cu was present as inorganic Cu(I)S compounds, which may be less toxic. (Résumé d'auteur)
Afficher plus [+] Moins [-]Field evaluation of hazardous waste pretreatment as an air pollution control technique.
1986
Allen C.C. | Blaney B.L. | Brant G. | Simpson S.
An overview of hazardous/toxic waste incineration.
1986
Lee C.C. | Huffman G.L. | Oberacker D.A.
The regulation of toxic air pollutants. A critical review.
1986
Cannon J.A.
Carbonaceous aerosol at urban and rural sites in the United States.
1986
Shah J.J. | Johnson R.L. | Heyerdahl E.K. | Huntzicker J.J.
