Measurement Of Soluble Plumbum In Water By Diffusive Gradient In Thin Film Technique With Three Different Liquid Binding Phases, Carboxymethyl Cellulose, Polyacrylic Acid Sodium And Poly (4-styrenesulfonate)

Metal species determine their biological absorption and toxicity, the concentration of trace metals used as a toxic effect and allowing the concentration of evaluation criteria tend to overestimate the effect of their poison. There is a very good relationship between biological absorption and concentration of free metal in environment. Researching the relationship between biological absorption and concentration of free metal is very important, it will develop a relatively simple and easy chemical analysis method, and according to the chemical form of assessment of the environmental analysis of trace metals to become increasingly toxic organisms current patterns of the important direction.There are a lot of ways to distinguish trace metal species and predict toxicity of trace metals, and this paper is used the diffusive gradient in thin films technique (DGT). This study is about the measurement of plumbum by DGT mechanisms with three different liquid binding phases, these binding phases are carboxymethyl cellulose (CMC), polyacrylic acid sodium (PAAS) and poly(4-styrenesulfonate) (PSS).Measuring the diffusion coefficient of plumbum in non-competitive water and the factors of result, such as pH, temperature, ionic strength, the bulk concentration of solution and so on. DGT mechanisms can measure the labile plumbum by evaluating the effect of Pb2+/ligand (EDTA, FA) ratio on the recovery of plumbum measured by three different binding phases, it was found that the mass of plumbum by different binding phases can be significantly different,suggesting the the DGT labile metal fractions were dependent on binding strength of the binding phase. By designing binding phases that can compete with different natural complexing ligands to varying extents,it is possible to use these DGT devices to measure metal speciation in natural waters. In laboratory conditions, the plumbum through the South Lake water testing also found similar results, which further verify the different binding phase has diffent combination.