Arsenic quantification and speciation at trace levels in natural water samples by total reflection X-ray fluorescence after pre-concentration with N-methyl-D-glucamine functionalized quartz supports,Journal of Analytical Atomic Spectrometry

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Arsenic quantification and speciation at trace levels in natural water samples by total reflection X-ray fluorescence after pre-concentration with N-methyl-D-glucamine functionalized quartz supports
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-09-16 , DOI: 10.1039/d0ja00385a
Kaushik Sanyal _{1,

2,

3,

4} , Sankararao Chappa _{2,

3,

4,

5} , J. Bahadur _{2,

4,

6,

7} , Ashok. K. Pandey _{2,

3,

4,

5,

8} , Nand Lal Mishra _{1,

2,

3,

4,

8}

Affiliation

Total reflection X-ray fluorescence (TXRF) spectrometry is a very effective multi-elemental analytical technique for the determination of metals at ultra trace concentrations in aqueous samples. In this work a novel and simple TXRF based method has been developed for the quantification and speciation of arsenic (As) at ultra trace levels in water samples. The quartz supports used for TXRF measurements were functionalized by anchoring (3-glycidyloxypropyl)trimethoxysilane by the sol–gel method and subsequently reacting with N-methyl-D-glucamine (NMDG). The novelty of this work is the introduction of gold nano particles (Au-Nps) as an internal standard on the sample support itself. We have utilized in situ reduction of chloroauric acid to gold nanoparticles which are grafted on sites of the NMDG membrane attached to the quartz sample supports. Thus, the anchored NMDG on quartz support serves dual objectives as it binds with As(V) and reduces AuCl₄⁻ ions to form Au nanoparticles. The As loaded quartz supports were presented for direct TXRF measurements and As determination. The TXRF determination of As species after separation resulted in speciation and quantification of As in water samples. The developed method was used for quantification and speciation of arsenic in water samples by TXRF and thus has a great societal application for the quality assessment of water samples in As contaminated areas.

中文翻译：

N-甲基-D-葡糖胺功能化石英载体预浓缩后，通过全反射X射线荧光分析自然水样中痕量水平的砷定量和形态

全反射X射线荧光（TXRF）光谱法是一种非常有效的多元素分析技术，用于测定水溶液样品中超痕量浓度的金属。在这项工作中，已经开发了一种新颖且简单的基于TXRF的方法，用于对水样品中痕量砷进行定量和形态分析。通过溶胶-凝胶法锚定（3-环氧丙氧基丙基）三甲氧基硅烷，然后与N-甲基-D-葡糖胺（NMDG）反应，将用于TXRF测量的石英支架功能化。这项工作的新颖之处在于在样品载体本身上引入了金纳米颗粒（Au-Nps）作为内标。我们就地利用了将氯金酸还原为金纳米颗粒，然后将金纳米颗粒接枝在与石英样品支架相连的NMDG膜上。因此，在石英支撑锚定NMDG起到双重目标，因为它与作为（结合V），并降低AUCL ₄^-离子形成的Au纳米颗粒。提出了用于直接TXRF测量和As测定的As负载石英支架。分离后通过TXRF测定As物种导致水样品中As的形成和定量。所开发的方法用于TXRF对水样中砷的定量和形态分析，在砷污染地区水样的质量评估中具有重要的社会应用价值。

更新日期：2020-11-03

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