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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/8181

Title: 固相抽出/液体電極プラズマ発光分析法による土壌中の鉛の定量
Authors: 熊井, みゆき
中山, 慶子
古庄, 義明
山本, 保
高村, 禅
Keywords: microplasma
portable analyser
atomic emission spectrometry
environmental analysis
Pb in soil
Issue Date: 2009-06
Publisher: 日本分析化学会
Magazine name: 分析化学
Volume: 58
Number: 6
Start page: 561
End page: 567
Abstract: 新しい原子発光分析である液体電極プラズマ法(LEP-AES法)は,中央が絞られた小型容器(横幅数mm)に数十μLの試料を入れ,そこに高電圧を印加する事でマイクロプラズマを発生させる方式である.ICP-AES法と異なり,アルゴンガスや大電力を必要としないため,小型化並びに可搬化が可能となり,本法を応用したハンディ元素分析装置が開発された. 本研究では,認証汚染土壌に含有されているPbをハンディ元素分析装置で測定する事を目的として,装置の性能評価を行った. 結果は波長405.8 nmにおける検出限界が13mg/L,相対標準偏差(RSD)は10%以下,直線性許容範囲は2桁と,ハンディ元素分析装置としては十分な性能であった. 汚染土壌は環境省告示第19号に準拠した方法で溶出液を作成し,固相抽出により分離濃縮後,測定を行った. 測定結果は80.2 mg/kg(dry)であり,認証値82.7± 3.8 mg/kg(dry)の許容範囲内の値であった. : Recently, environmental pollution by toxic metals, such as Cd, Pb, Cr, and so on, is getting increasingly worse. In order to increase measurement chances, a portable elemental analyzer is expected to be developed. Conventionally, the measurement of trace metals in environmental pollution was done by atomic absorption spectrometry (AAS), or inductively coupled plasma atomic emission spectrometry (ICP-AES). However those instruments are very expensive, and require a large amount of Ar gas, a nebulizer, and a high power source, and is thus not suitable for portable use. Liquid electrode plasma atomic emission spectrometry (LEP-AES) is a novel atomic emission spectrometry, where a sample solution is put into micro channel whose center is made to be narrower. A high voltage is applied to the solution from both ends, and then a micro-plasma is generated in the channel. This technique is different from ICP-AES due to the following points : it doesn’t require a plasma gas or a nebulizer, and an ultra compact and portable element analyzer can be made. In this study, the performance of this analyzer was investigated with a solid phase extraction (SPE) method to measure the Pb concentration in soil. At first, the basic performance was confirmed without SPE. In the result, it is found that the limits of detection (LOD) for Pb by this system is 1.3 mg/L at 405.8 nm, the relative standard deviation is under 10%, and the calibration curve has good linearity at a Pb concentration of less than 800 mg/L. Those values are good enough to measure Pb in soil. Next, heavy metals in standard soil sample (sea bottom material) were extracted into water by the official method. Lead in the extract was separated from other elements by solid-phase extraction, and was then concentrated. By measuring the SPE elution using the LEP-AES system, the original concentration of Pb in the soil was determined to be 80.2 mg/kg (dry), which was close to the certificated value of the soil of 82.7±3.8 mg/kg.
Rights: Copyright (C) 2009 日本分析化学会. 熊井 みゆき, 中山 慶子, 古庄 義明, 山本 保, 高村 禅, 分析化学, 58(6), 2009, 561-567.
URI: http://hdl.handle.net/10119/8181
Material Type: publisher
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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