Occurrence of consistent nM levels of phosphate in doubly demineralized and demineralized-distilled water.
A double demineralization system and a demineralization-distillation system operated over several months consistently delivered water that was approximately 30 nM in phosphate, as determined by a molybdenum blue spectrophotometric method. Silicate and hydrolysed polyphosphate in the water, and contaminants in the analytical reagents, were eliminated as sources of error in the determination. Caution is suggested in preparing blanks and dilutions in analyses of samples of natural waters or plant nutrient solutions, when either of these types of purification system is used.
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Environmental Science Group, LS-6, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.