By Jitendra Saxena (Eds.)
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Additional info for Hazard Assessment of Chemicals. Current Developments
They recom mended a cascade system (sequential ultrafiltration) to reduce filter clogging and the adsorptive effect of high-molecular-weight compounds when samples were filtered directly through membranes with small pore sizes. Hoffmann et al. (150) adapted these procedures to investigate organometallic complexes in river water. They utilized the concentration technique in conjunction with sequential ultrafiltration and avoided large concentration gradients by reducing the volume by only 50% at each step.
The median retention diameter is immediately apparent. The slope of the curve reflects the degree of uniformity of the pores such that a steep slope is indicative of a highly selective filter. Although cellulose acetate, glass fiber, and silver filters may be used for total particle retention, they are not applicable for size fractionation (69, 229, 230). In general, the effective pore size may be considerably smaller than that stated, and decreases further with filter loading. As is evident in Fig.
Preconcentration of the analyte together with the elimination of matrix interferences significantly improve the sensitivity of AAS. In a fashion similar to ASV, the speciation of some metals may be examined by differential elec trodeposition under adjusted solution conditions or at different potentials. Batley (17) measured electroactive cadmium and lead in seawater by AAS following an electrodeposition procedure. Metals could be electrodeposited in situ at natural pH and in the presence of oxygen.
Hazard Assessment of Chemicals. Current Developments by Jitendra Saxena (Eds.)