%0 Journal Article
%T Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomolybdate complex
%A RANDJEL P. MIHAJLOVIC
%A NATASA R. IGNJATOVIC
%A MARIJA R. TODOROVIC
%A IVANKA HOCLAJTNER-ANTUNOVIC
%J Journal of the Serbian Chemical Society
%D 2003
%I Serbian Chemical Society
%X 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 (¡À2 %). Beer s 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).
%K spectrophotomery
%K phosphorus determination
%K coal
%K coal ash
%K bismuth phosphomolybdate complex
%U http://www.shd.org.yu/HtDocs/SHD/Vol68/No1/V68-No1-08.pdf