Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomolybdate complex

A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue (molibdenum blue) by reduction with ascorbi...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society 2003-01, Vol.68 (1), p.65-73
Main Authors: VESNA M. KALJEVIC, IVANKA HOCLAJTNER-ANTUNOVIC, MARIJA R. TODOROVIC, RANDJEL P. MIHAJLOVIC, NATASA R. IGNJATOVIC
Format: Article
Language:English
Subjects:
bismuth phosphomolybdate complex
coal
coal ash
phosphorus determination
spectrophotomery
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Summary:A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue (molibdenum blue) by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66x104 dm3 mol-1cm-1 at 720 nm and 2.10x104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (±2 %). Beers law is obeyed in the for concentration range to 0.6 mg/mL (aqueous solution) and to 1.2 mg/mL P (MIBK). The sesitivity of the proposed method is 0.0078 mg/mL (aqueous solution) and 0.0066 mg/mL (MIBK).
ISSN:0352-5139
DOI:10.2298/JSC0301065M