An analytical method to accurately determine trace levels of Se and Te is essential to meet the growing importance of these elements to Earth science research. Herein, an in-house assembled photochemical vapour generation (PVG) unit, instead of normal sample nebulisation, with inductively coupled plasma-mass spectrometry (ICP-MS), was developed for the detection of Se and Te in geological samples. The major parameters that might potentially influence the PVG efficiencies of Se(IV) and Te(IV) were investigated. The unit could fully generate volatile species under 30 s of ultraviolet irradiation in the presence of 15% v/v formic acid, 15% v/v acetic acid and 50 mg l^-1 of Co²⁺. Under optimised conditions, the limit of detections (LODs, 3s, n = 11) of the proposed method were 0.5 ng l^-1 for Se and 0.6 ng l^-1 for Te. The RSDs of Se and Te were 2.0% and 2.3% (1 μg l^-1, n = 7), respectively. Interference experiments showed that Fe, Ti, V and Cu have certain negative effects, so the standard addition method was used for real sample analysis. Measurement results for eleven CRMs, including soils (GSS-4, GSS-7), sediments (GSD-9, GSD-10) and rocks (GSR-1, GSR-2, GSR-3, GSR-5, AGV-2, GSP-2 and W-2a), were consistent with literature values, and showed better precision, indicating the feasibility of the proposed method for determination of trace Se and Te in geological samples.

中文翻译：

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光化学蒸汽发生结合电感耦合等离子体质谱法测定地质样品中的痕量硒和碲

准确测定痕量 Se 和 Te 的分析方法对于满足这些元素对地球科学研究日益增长的重要性至关重要。本文开发了一种内部组装的光化学蒸汽发生 (PVG) 装置，采用电感耦合等离子体质谱 (ICP-MS) 代替正常的样品雾化，用于检测地质样品中的 Se 和 Te。研究了可能影响 Se(IV) 和 Te(IV) 的 PVG 效率的主要参数。该装置在15% v / v甲酸、15% v / v乙酸和50mg l ^-1 Co ²⁺存在下，在紫外线照射30s下即可完全生成挥发性物质。在优化条件下，该方法的检测限（LOD，3 s，n = 11）对于 Se为 0.5 ng l ^-1 ，对于 Te为 0.6 ng l ^-1 。 Se 和 Te 的 RSD 分别为 2.0% 和 2.3% (1 μg l ^-1 , n = 7)。干扰实验表明Fe、Ti、V、Cu有一定的负面影响，因此采用标准添加法进行实际样品分析。十一种 CRM 的测量结果，包括土壤（GSS-4、GSS-7）、沉积物（GSD-9、GSD-10）和岩石（GSR-1、GSR-2、GSR-3、GSR-5、AGV-2） 、GSP-2和W-2a）与文献值一致，精密度较好，表明该方法测定地质样品中痕量Se和Te的可行性。