1995 Fiscal Year Final Research Report Summary
Study on Rapid Pretreatment Method with Cobalt (III) Ions for Speciation of phosphorus in Environmental Samples
| Project/Area Number |
06640789
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
分離・精製・検出法
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| Research Institution | The University of Tokushima |
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Principal Investigator |
TANAKA Hideji Tokushima Univ., Pharm.Sci., Associate Prof., 薬学部, 助教授 (40207121)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Kensaku Tokushima Univ., Pharm.Sci., prof., 薬学部, 教授 (10101049)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Cobalt (III) ion / Oxidation / Pretreatment / Organic Phosphorus / Molybdenum blue / Flow injection analysis / Electrolysis / Spectrophotometric determination |
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| Research Abstract |
A pretreatment method of organic phosphorus based on cobalt (III) oxidation, was studied for spectrophotometric determination of phosphorus in environmental water samples ; cobalt (III) ions were produced through the electrolysis of an acidic solution of cobalt (II) sulfate. The pretreatment first examined in a batchwise mode and then applied to an on-line pretreatment in a system of flow injection analysis (FIA). The cobalt (III) pretreatment enabled complete conversion of mg dm^<-3> level of phosphorus of organic phosphorus compounds having C-O-P or C-P bond into phosphate ions within 7 min at room temperature with an aid of a platinum catalyst ; cobalt (III) ions from the reagent did not interfere with the subsequent determination of phosphate ions by the Molybdenum Blue method. Condensed phosphates required heating at 95-100ﾟC for complete hydrolysis during the pretreatment. The detection limit for phosphorus was 0.005 mg dm^<-3> and 10-12 samples could be determined per 1h (the FIA system). Since the present method was free from any interference from coexisting organic and inorganic substances, except at a relatively high level of reducing substances, it is applicable to the determination of organic or total phosphorus in real water samples.
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