Determination of phosphate ions in natural water by solvent extraction/ICP-AES.

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  • 天然水中のリン酸イオンの溶媒抽出／誘導結合プラズマ発光分析法による定量
  • テンネンスイチュウ ノ リンサン イオン ノ ヨウバイ チュウシュツ ユウドウ

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Abstract

ICP-AES was used to determine trace amounts of phosphate ion in natural water. Although plasma atomizer showed extremely high atomic emission intensity for phosphorus, its direct determination in natural water is difficult because of the spectral interference from silicate and iron ion and the very low phosphate ion contents in seawater. Therefore, natural water samples were pretreated using a separation process to remove interfering elements and concentrate phosphate ion. This process consisted of a solvent extraction using hydrochloric acid-molybdate as complexing agent and 1-octanol, which has a lower solubility in water, as the organic solvent was suitable for ICP. Samples of natural water, which had been previously filtered through a 0.45 μm Millipore filter were analyzed. Each aliquot of the test sample, 50250 ml, was adjusted to 0.5 mol/dm3 with hydrochloric acid. Five percent ammonium molybdate (525 ml) and 5 ml of 1octanol were added. After shaking and centrifugation, the organic phase was injected directly into the ICP, operating conditions : 1.8 kW RF power, 0.40 l/min carrier gas, 18 l/min coolant gas and 1.1 l/min plasma gas. The detection limit (3σ) of phosphorus was ca. 0.05 μg/ml at the 214.9 nm. The phosphate ion in water from Lake Biwa was 1232 μg/ml.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 40 (1), 19-24, 1991

    The Japan Society for Analytical Chemistry

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