Short communications.
Preconcentration of phosphate as molybdoantimonylphosphoric acid on polyurethane foam has been combined with X-ray fluorescence measurement of antimony for the indirect determination of phosphate. The extraction is optimum between pH 1 and 3.6 and no interference is observed from silicate. The precision is 5% RSD at the 0.25-mug ml level and the detection limit is 20 ng ml for 100 ml of sample solution.
Khan
A S
AS
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada.
Chow
A
A