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  • Title: An application of silaned glass beads to the preconcentration and spectrophotometric determination of traces of phosphorus with molybdate.
    Author: Taguchi S, Goto K, Watanabe H.
    Journal: Talanta; 1981 Aug; 28(8):613-5. PubMed ID: 18962968.
    Abstract:
    Silaned glass beads are applied to the preconcentration and spectrophotometric determination of phosphorus as the phosphomolybdenum blue complex. Traces of phosphorus in water are collected as a phosphomolybdenum blue complex on a column of the beads. The phosphomolybdenum blue is eluted with N,N-dimethylformamide and the absorbance of the eluate continuously monitored at 700 nm. The height of the very sharp peak obtained is proportional to the amount of phosphorus present and 0.1-0.5 mug of phosphorus in a 10-ml sample can be determined reproducibly. Interference from arsenate is eliminated by addition of a reducing agent. High concentrations of silica cause a small positive error. This method is applicable to the analysis of river water and sea-water samples.
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