Arsenic is ranked as the first compound in the Substance Priority List 2023 by the Agency for Toxic Substances and Disease Registry (ATSDR). The most prominent entrance to the human body is through drinking water wherein the predominant species are arsenite and arsenate. The more toxic As(III) has rigorously threatened human health worldwide; hence, speciation and separation are the need of the hour. In this article, we have reported a simple method of arsenic speciation by wavelength dispersive X-ray fluorescence (WD-XRF) spectrometer. Valence to core (VtC) electronic transitions, i.e., AsKβ2,5 fluorescence lines were used for arsenic speciation. This speciation study by WD-XRF entails direct measurement of activated alumina pellets containing arsenate and arsenite species adsorbed from water sample without separation of the trivalent and pentavalent species. This is the first report wherein the X-ray technique has been explored for speciation analysis of arsenic and the biggest advantage of the method lies in its applicability to direct analysis of synthesized nanotubes or other solid-phase extraction sorbents entrapping both the arsenic species. For determination of total arsenic using activated alumina as adsorbent, the most intense AsKα1,2 analytical lines were used and the instrumental limit of detection and the lower limit of quantification were 0.23 μg/L and 0.89 μg/L, respectively. For speciation, these limits were calculated to be 50 μg/L and 200 μg/L, respectively.

中文翻译：

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X 射线光谱技术测定饮用水样品中的砷及其形态。

砷被有毒物质和疾病登记局 (ATSDR) 列为 2023 年优先物质清单中的第一个化合物。进入人体最显着的途径是通过饮用水，其中主要成分是亚砷酸盐和砷酸盐。毒性更强的As(III)严重威胁着全世界人类的健康；因此，物种形成和分离是当前的需要。在本文中，我们报道了一种利用波长色散 X 射线荧光 (WD-XRF) 光谱仪进行砷形态分析的简单方法。价核 (VtC) 电子跃迁，即 AsKβ2,5 荧光线用于砷形态分析。通过 WD-XRF 进行的形态分析研究需要直接测量从水样中吸附的含有砷酸盐和亚砷酸盐物质的活性氧化铝颗粒，无需分离三价和五价物质。这是第一份探索 X 射线技术用于砷形态分析的报告，该方法的最大优点在于其适用于直接分析合成纳米管或其他固相萃取吸附剂捕获两种砷形态。以活性氧化铝为吸附剂测定总砷时，采用最强的AsKα1,2分析线，仪器检出限和定量下限分别为0.23 μg/L和0.89 μg/L。对于形态形成，这些限值经计算分别为 50 μg/L 和 200 μg/L。