Learning from Headspace Sampling: a Versatile High-Throughput Reactor for Photochemical Vapor Generation,Analytical Chemistry

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Learning from Headspace Sampling: a Versatile High-Throughput Reactor for Photochemical Vapor Generation
Analytical Chemistry ( IF 6.7 ) Pub Date : 2022-11-11 , DOI: 10.1021/acs.analchem.2c04401
Yubin Su ₁ , Yao Lin ₂ , Rui Yang ₁ , Liangbo He ₁ , Jiahui Yang ₁ , Xiaoming Jiang ₃ , Chengbin Zheng ₁

Affiliation

Inspired by the headspace sampling (HS) device, a versatile high-throughput photochemical reactor with twenty vessels serving as both the photochemical vapor generator and the HS device was developed for the rapid and sensitive determination of mercury, nickel, and selenium by coupling photochemical vapor generation (PVG) to atomic fluorescence spectrometry (AFS) or point discharge optical emission spectrometry (μPD-OES). The photochemical reactor utilized a specially designed annular UV lamp around which the vessels containing sample solution were automatically rotated and irradiated to yield gaseous analyte species. Subsequently, the species escaped into the headspace of vessels prior to introduction to the atomic spectrometer. Compared with the conventional flow injection (FI) or continuous flow (CF) PVG, the developed PVG-HS method possesses several unique advantages including high throughput (260 pcs h^–1), high sensitivity, and the elimination of matrix interference from transition metal ions and the memory effect associated with the quantification of mercury. Limits of detection (LODs) of 0.002, 0.007, and 0.01 μg L^–1 were obtained for Hg (II), Ni (II), and Se (IV) by PVG–HS–AFS, respectively, and 0.02 and 0.2 μg L^–1 were obtained for Hg (II) and Ni (II) by PVG–HS−μPD-OES, respectively. The practicality of the reactor was evaluated by the detection of Hg (II), Ni (II), and Se (IV) in five certified reference materials, including water (GBW08603, GBW08607, and GBW(E)080395), National Research Council Canada dogfish liver (DOLT-5), fish protein (DORM-4), and three river water samples with good recoveries (92–106%).

中文翻译：

从顶空采样中学习：用于光化学蒸汽生成的多功能高通量反应器

受顶空进样 (HS) 装置的启发，开发了一种多功能高通量光化学反应器，具有 20 个容器，既用作光化学蒸气发生器又用作 HS 装置，通过耦合光化学蒸气快速灵敏地测定汞、镍和硒生成 (PVG) 到原子荧光光谱法 (AFS) 或点放电发射光谱法 (μPD-OES)。光化学反应器使用专门设计的环形紫外灯，装有样品溶液的容器围绕该灯自动旋转并照射以产生气态分析物。随后，该物种在引入原子光谱仪之前逃逸到容器的顶部空间。与常规流动注射（FI）或连续流动（CF）PVG相比，^–1 )、高灵敏度、消除过渡金属离子的基质干扰以及与汞定量相关的记忆效应。通过 PVG–HS–AFS，Hg (II)、Ni (II) 和 Se (IV) 的检测限 (LOD) 分别为 0.002、0.007 和 0.01 μg L –1，0.02 和 0.2 ^μg L通过 PVG-HS-μPD-OES 分别获得了 Hg (II) 和 Ni (II) 的^{–1 。}该反应器的实用性通过检测五种认证标准物质中的 Hg (II)、Ni (II) 和 Se (IV) 来评估，包括水 (GBW08603、GBW08607 和 GBW(E)080395)，国家研究委员会加拿大角鲨肝 (DOLT-5)、鱼蛋白 (DORM-4) 和三个回收率良好 (92–106%) 的河水样本。

更新日期：2022-11-11

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