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CONTROL OF CADMIUM CARBONATE PRECIPITATION INTERFERENCES DURING THE DIALYSIS OF CADMIUM IN HIGH BICARBONATE ALKALINITY AQUATIC-LIFE BIOASSAY WATERS
Citation:
Poldoski, J. CONTROL OF CADMIUM CARBONATE PRECIPITATION INTERFERENCES DURING THE DIALYSIS OF CADMIUM IN HIGH BICARBONATE ALKALINITY AQUATIC-LIFE BIOASSAY WATERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-86/001 (NTIS PB86145620), 1985.
Description:
The precipitation of cadmium carbonate during the dialysis of cadmium in a high bicarbonate alkalinity natural water, was linked to a significant source of error when determining dialyzate cadmium concentrations. The relative standard deviation was reduced by approximately four-fold when this precipitation was controlled by adding a particular preparation of humic acid to the dialysis bag filling solution. Linear regression correlation coefficients for sample-by-sample comparisons between resultant dialysis values and corresponding free cadmium values, obtained by cadmium ion selective electrode, were 0.90 or greater for concentrations in the range of 2 micrograms/L to 132 micrograms/L Cd(+2).