Abstract In this paper, gallium (Ga) and indium (in) in water samples were determined by atomic emission spectrometry (AES) with solution cathode glow discharge (SCGD) as an excitation source. The optimal working conditions for the detection of Ga and in by proposed method are 660 V discharge voltage, 3.0 mL min−1 solution flow rate and pH = 1.0 HNO3 as supporting electrolyte. Under these conditions, it is found that there are no obvious interferences from most of the foreign ions when they exist in 20-fold excess over the in. But for Ga, the interferences from foreign ions are severe. The linear correlation coefficient (R2) is better than 0.99 with a range of 1–40 μg mL−1 for Ga and 0.1–30 μg mL−1 for in. The limits of detection (LODs) for Ga and in are 0.10 and 0.016 μg mL−1, respectively. The relative standard deviations (RSDs) are 2.9% for Ga and 3.9% for in, and the power is below 55 W. to validate the utility and accuracy of the proposed system, two water samples spiked with various concentration (0.3–20 μg mL−1) of Ga and in are directly determined, and the measured results are only in good agreement with spiked values of in. After diluted 10 times for water samples, the spiked values (0.3–20 μg mL−1) of Ga agree well with the measured value, suggesting that the matrix could interfere with the determination of Ga. The satisfactory recoveries between 90% and 109% of in and Ga were achieved

中文翻译：

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用溶液阴极辉光放电作为原子发射光谱激发源测定镓和铟

摘要 本文以溶液阴极辉光放电（SCGD）为激发源，采用原子发射光谱法（AES）测定水样中的镓（Ga）和铟（in）。通过所提出的方法检测 Ga 和 in 的最佳工作条件是 660 V 放电电压、3.0 mL min-1 溶液流速和 pH = 1.0 HNO3 作为支持电解质。在这些条件下，发现当外来离子的存在量超过 in 20 倍时，大多数外来离子没有明显的干扰。但对于 Ga，外来离子的干扰很严重。线性相关系数 (R2) 优于 0.99，Ga 的范围为 1–40 μg mL-1，in 的范围为 0.1–30 μg mL-1。 Ga 和 in 的检测限 (LOD) 为 0.10 和 0.016分别为 μg mL−1。相对标准偏差 (RSD) 为 2。