Potential of the hydride generation technique coupled to inductively coupled plasma optical emission spectrometry for non-chromatographic As speciation,Journal of Analytical Atomic Spectrometry

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Potential of the hydride generation technique coupled to inductively coupled plasma optical emission spectrometry for non-chromatographic As speciation
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2017-06-12 00:00:00 , DOI: 10.1039/c7ja00107j
Maja Welna _{1,

2,

3,

4,

5} , Pawel Pohl _{1,

2,

3,

4,

5}

Affiliation

A systematic study of hydride generation (HG) in the sample introduction step combined with inductively coupled plasma optical emission spectrometry (ICP OES) for non-chromatographic As speciation from solutions of As(III), As(V), dimethylarsinate (DMA) and monomethylarsonate (MMA) is presented. Hydrides were generated in the reaction with NaBH₄ in the acidic medium using a continuous flow system with a gas–liquid phase separation directly coupled with ICP. Optimization of the HG operational parameters was performed to improve the detectability of As. The different reactivities of the examined As species under various reaction conditions [in terms of the type and concentration of acids (HCl, acetic and citric), buffers (acetate and citrate), the NaBH₄ concentration and presence of pre-reducing agents (KI-ascorbic acid, thiourea-ascorbic acid and L-cysteine)] were used for selective generation of their individual hydrides. The relationship among As(III), As(V), DMA and MMA signals under different reduction conditions was studied and discussed. Considering all favorable pre-reducing and HG reaction conditions, five speciation procedures (SPs) for species-selective HG of As in one solution, including SP1 for [As(III)], SP2 for [As(III) + DMA], SP3 for [As(III) + As(V) + MMA], SP4 for [DMA + MMA] and SP5 for [As(III) + As(V) + DMA + MMA], were evaluated. Differentiation between As(III), As(V), DMA and MMA along with distinguishing between species having the same nature, i.e. i-As [As(III,V)] and o-As (DMA, MMA), was achieved. By combining the analytical responses obtained with HG-ICP OES, the experimental protocols for determination and non-chromatographic speciation (both individual and operational) of hydride-active As species were proposed.

中文翻译：

氢化物发生技术与电感耦合等离子体发射光谱法耦合用于非色谱As形态的潜力

样品引入步骤中的氢化物生成（HG）与电感耦合等离子体发射光谱法（ICP OES）相结合的系统研究，用于从As（III），As（V），二甲基砷酸（DMA）和介绍了单甲基ar酸酯（MMA）。使用连续流系统直接与ICP联用，在酸性介质中与NaBH ₄在酸性介质中反应生成氢化物。进行HG操作参数的优化以提高As的可检测性。在各种反应条件下[根据酸（HCl，乙酸和柠檬酸），缓冲液（乙酸盐和柠檬酸盐），NaBH的类型和浓度，所检测的As物种的不同反应性）₄浓度和存在预还原剂（KI-抗坏血酸，硫脲-抗坏血酸和L-半胱氨酸）用于选择性生成其各自的氢化物。研究和讨论了不同还原条件下As（ III），As（ V），DMA和MMA信号之间的关系。考虑到所有有利的预还原和HG反应条件，在一种溶液中对As进行物种选择性HG的五种物种形成程序（SP），包括[As（ III）]的SP1，[As（ III）+ DMA]的SP2，SP3对于[As（ III）+ As（ V）+ MMA]，SP4对于[DMA + MMA]，SP5对于[As（ III）+ As（ V））+ DMA + MMA]，进行了评估。实现了对As（III），As（V），DMA和MMA的区分，以及对具有相同性质的物种即i-As [As（III，V）]和o-As（DMA，MMA）的区分。通过结合使用HG-ICP OES获得的分析响应，提出了用于测定氢化物活泼的As种类和进行非色谱分析的实验规程（包括单独的和操作的）。

更新日期：2017-06-12

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