| Autor: |
VESNA M. KALJEVIC, IVANKA HOCLAJTNER-ANTUNOVIC, MARIJA R. TODOROVIC, RANDJEL P. MIHAJLOVIC, NATASA R. IGNJATOVIC |
| Jazyk: |
angličtina |
| Rok vydání: |
2003 |
| Předmět: |
|
| Zdroj: |
Journal of the Serbian Chemical Society, Vol 68, Iss 1, Pp 65-73 (2003) |
| Druh dokumentu: |
article |
| ISSN: |
0352-5139 |
| Popis: |
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). |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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