Study on Rapid Pretreatment Method with Cobalt (III) Ions for Speciation of phosphorus in Environmental Samples

钴(III)离子快速预处理环境样品中磷形态的研究

• 批准号: 06640789
• 负责人: TANAKA Hideji
• 金额: $ 1.09万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640789/
• 关键词: Cobalt (III) ion; Oxidation; Pretreatment; Organic Phosphorus; Molybdenum blue; Flow injection analysis; Electrolysis; Spectrophotometric determination; 3価コバルトイオン; 前処理; リン; 吸光光度定量; 化学形態別定量; 酸化分解; 環境試料

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.

研究了钴（III）氧化有机磷的前处理方法，通过电解硫酸钴（II）的酸性溶液产生钴（III）离子，用于光度法测定环境水样中的磷。该预处理方法首先以间歇方式进行检测，然后应用于流动注射分析系统中的在线预处理。钴（III）预处理使得<-3>具有C-O-P或C-P键的有机磷化合物的mg dm ↑ [2]水平的磷在室温下借助于铂催化剂在7分钟内完全转化为磷酸根离子;来自试剂的钴（III）离子不干扰随后通过钼蓝法测定磷酸根离子。在预处理过程中，缩合磷酸盐需要在95-100 ℃下加热才能完全水解。磷的检测限为0.005 mg dm ↑ <-3>[3]，每小时可测定10-12个样品（FIA系统）。除还原性物质含量较高外，本方法不受有机物和无机物共存的干扰，适用于真实的水样中有机磷和总磷的测定。

项目成果

Hideji Tanaka: "Cobalt (III) Oxidation Pretreatment of Organic Phosphorus Compounds for a Spectrophotometric Determination of Phosphorus in Water" Analytical Sciences. 10. 769-774 (1994)

Hideji Tanaka：“用于分光光度法测定水中磷的有机磷化合物的钴 (III) 氧化预处理”分析科学。

Hideji Tanaka, Terumi Fukuoka and Kensaku Okamoto: ""On-Line Pretreatment with Cobalt (III) Ions for a Flow Injection-Spectrophotometric Determination of Organic Phosphorus"" Analytical Sciences. 11. 787-792 (1995)

Hideji Tanaka、Terumi Fukuoka 和 Kensaku Okamoto：“用于流动注射-分光光度测定有机磷的钴 (III) 离子在线预处理”分析科学。

Hideji Tanaka: "On-Line Pretreatment with Cobalt (III) Ions for a Flow Injection-Spectrophotometric Determination of Organic Phosphorus" Analytical Sciences. 11. 787-792 (1995)

Hideji Tanaka：“用钴 (III) 离子进行在线预处理，用于流动注射分光光度法测定有机磷”分析科学。

Hideji Tanaka, Terumi Fukuoka and Kensaku Okamoto: ""Cobalt (III) Oxidation Pretreatment of Organic Phosphorus Compounds for a Spectrophotometric Determination of Phosphorus in Water"" Analytical Sciences. 10. 769-774 (1994)

Hideji Tanaka、Terumi Fukuoka 和 Kensaku Okamoto：“用于分光光度法测定水中磷的有机磷化合物的钴 (III) 氧化预处理”分析科学。

Hideji Tanaka: "Cobalt(III) Oxidation Pretreatment of Organic Phosphorus Compounds for a Spectrophotometric Determination of Phosphorus in Water" Analytical Sciences. 10. 769-774 (1994)

Hideji Tanaka：“用于分光光度法测定水中磷的有机磷化合物的钴 (III) 氧化预处理”分析科学。