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首页> 外文期刊>Analytica chimica acta >Investigation of four digestion procedures for multi-element determination of toxic and nutrient elements in legumes by inductively coupled plasma-optical emission spectrometry
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Investigation of four digestion procedures for multi-element determination of toxic and nutrient elements in legumes by inductively coupled plasma-optical emission spectrometry

机译：电感耦合等离子体发射光谱法测定豆类中有毒和营养元素的四种消解方法

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摘要

A simple and reliable multi-element procedure for determination of essential (Cr,Cu,Fe,Mg,Mn,Zn) and toxic (Al,Cd,Pb) elements in legumes by inductively coupled plasma-optical emission spectrometry (ICP-OES) was developed.In this contribution,four different digestion procedures were thoroughly investigated and accurately evaluated with respect to their affect on the analysis of legumes.These included wet digestion with HNO_3/H_2SO_4 and HNO_3/H_2SO_4/H_2O_2,and dry ashing with Mg(NO_3)_2 and Mg(NO_3)_2/HNO_3.Two calibrations (aqueous standard and standard addition) procedures were studied,and proved that standard addition was preferable for all analytes.ICP-OES operating parameters,such as radio-frequency (RF) incident power,sample uptake flow rate and nebulizer argon gas flow rate were optimized.The precision as repeatability,expressed as relative standard deviation (R.S.D.) for aqueous standard containing 250 mug l~(-1) of each analyte was in the range 1.5-8.0%.The accuracy,expressed as relative error was generally varied in the range of 0.5-10% for all analytes,while the quantification limits were lower than 2.5 mug g~(-1).Although,acceptable results were obtained from all developed procedures,wet digestion method with HNO_3/H_2SO_4/H_2O_2 is recommended for better recovery.The good agreement between measured and certified concentrations with respect to IAEA-331 and IAEA-359 (CRM's supplied by IAEA,International Atomic Energy Agency) indicates that the developed analytical method is well suited for determination of toxic and nutrient elements in legumes and possibly similar matrices.
机译：通过电感耦合等离子体发射光谱法（ICP-OES）测定豆类中的必需（Cr，Cu，Fe，Mg，Mn，Zn）和有毒（Al，Cd，Pb）的简单可靠的多元素程序为此，对四种不同的消解程序对豆类分析的影响进行了彻底的研究和准确评估，包括湿法HNO_3 / H_2SO_4和HNO_3 / H_2SO_4 / H_2O_2消解以及Mg（NO_3 ）_2和Mg（NO_3）_2 / HNO_3。研究了两种校准方法（水性标准液和标准添加液），并证明标准添加液适用于所有分析物.ICP-OES的工作参数，例如射频（RF）入射功率，样品吸收流速和雾化器氩气流速都得到了优化。每种分析物包含250杯l〜（-1）的水标样的重复精度，相对标准偏差（RSD）表示为1.5-8.0 ％。精度，表示由于所有分析物的相对误差通常在0.5-10％的范围内变化，而定量限低于2.5杯g〜（-1）。尽管从所有已开发的程序，HNO_3湿法消解方法中都获得了可接受的结果建议使用/ H_2SO_4 / H_2O_2以提高回收率。关于IAEA-331和IAEA-359（由国际原子能机构IAEA提供的CRM），实测浓度和认证浓度之间的良好一致性表明，开发的分析方法非常适合于测定豆类和类似基质中的有毒和营养元素含量。

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