Download Reviews of Environmental Contamination and Toxicology: by P. M. Outridge, B. N. Noller (auth.), George W. Ware (eds.) PDF

By P. M. Outridge, B. N. Noller (auth.), George W. Ware (eds.)

Reviews of Environmental illness and Toxicology publishes authoritative stories at the prevalence, results, and destiny of pesticide residues and different environmental contaminants. it's going to retain you expert of the most recent major concerns via supplying in-depth info within the components of analytical chemistry, agricultural microbiology, biochemistry, human and veterinary medication, toxicology, and nutrients technology.

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Extra resources for Reviews of Environmental Contamination and Toxicology: Continuation of Residue Reviews

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Trace Elements in Freshwater Plants 37 Table 18. " Element Cd Cr Cu Mn Ni Pb Zn 1 0 6 2 2 7 1 10 6 2 5 2 1 6 0 1 5 2 2 6 3 2 3 3 15 15 12 9 Leaves Stems Roots Uniform Distribution No. t parts were analysed. Numbers indicate number of species in which given tissue contained the highest concentration. region of New Zealand. Maximum and median concentrations of Hg and Cr in polluted plants were similar to those in putatively uncontaminated plants. This is surprising in view of their widespread use in industrialized societies.

The explanation for this pattern is uncertain, although aeolian deposition of some pollutants may have been significant. " III. Environmental and Physiological Factors Affecting Element Accumulation Trace element uptake and retention by macrophytes are controlled by four variables: (i) sediment geochemistry; (ii) water physicochemistry; (iii) plant physiology; and (iv) genotypic differences. The former two control metal speciation in sediments and the water column, while the latter control the intrinsic ability of plants to accumulate available elemental forms.

Noller porous tissues allowing greater internal surface adsorption of metals; (ii) accumulation of particles in pores; (iii) microbial accumulation of metals; and (iv) metals concentrating in tissues more resistant to degradation (Gallagher and Kibby 1980). The key point is that, due to the absorption of elements by detritus from water, the decomposition of FVPs provides a mechanism for sediment enrichment oftrace elements, or for food-chain entry of metals via detrital feeders. B. Entry of Toxic Elements into Food Chains Virtually no work has been done on the role of FVP biomass as a source of trace elements entering food chains, although herbivores grazing contaminated aquatic plants assimilate metals from that source.

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