A novel portable excitation microsource for optical emission spectrometry (OES) based on atmospheric pressure glow discharge with a liquid drop anode (LDA-APGD), generated in a ceramic microchip (mch), was developed. This excitation microsource uses low temperature cofired ceramic (LTCC) microchips to provide electrical contact and fabricate a hollow to hold a microsample solution. Optimization of this new excitation source was performed for the quantification of Hg in liquid samples and discussed. Optimal parameters for Hg determination were: polarized liquid drop – anode, discharge current – 80 mA, solution drop volume – 15 μL, He flow rate – 300 mL min⁻¹, chip hollow dimensions: diameter 3.0 mm and depth 0.6 mm, HNO₃ concentration – 0.10 mol L⁻¹. The addition of low molecular weight organic compounds (LMWOCs) to the solution was also tested. The linearity range for mch-LDA-APGD was up to 30 mg L⁻¹, and the limit of detection (LOD) of Hg was 47 μg L⁻¹. Precision of this method was within 0.65–8.7% (as the relative standard deviation of repeated measurements). Recoveries obtained for tap water samples spiked with Hg(II) ions at 100, 200, and 300 μg L⁻¹ were within the range of 96–122%.

中文翻译：

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以LDA-APGD作为OES激发源的陶瓷微芯片–用于微样品分析的灵敏的汞检测传感器

开发了一种新颖的便携式激发微源，用于光学发射光谱（OES），它基于在陶瓷微芯片（mch）中产生的带有液滴阳极（LDA-APGD）的大气压辉光放电。该激发微源使用低温共烧陶瓷（LTCC）微芯片来提供电接触并制造空腔以容纳微量样品溶液。对这种新的激发源进行了优化，以定量分析液体样品中的汞。确定Hg的最佳参数为：极化液滴–阳极，放电电流– 80 mA，溶液液滴体积– 15μL，He流量– 300 mL min ^-1，芯片空心尺寸：直径3.0 mm，深度0.6 mm，HNO ₃浓度– 0.10 mol L ^-1。还测试了向溶液中添加低分子量有机化合物（LMWOC）。mch-LDA-APGD的线性范围最高为30 mg L ^-1，汞的检出限（LOD）为47μgL ^-1。该方法的精确度在0.65-8.7％之内（作为重复测量的相对标准偏差）。分别以100、200和300μgL ^-1的Hg（II）离子加标的自来水样品的回收率在96–122％的范围内。