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首页> 外文期刊>Microchemical Journal: Devoted to the Application of Microtechniques in all Branches of Science >Evaluation of open-air type electrolyte-as-cathode glow discharge-atomic emission spectrometry for determination of trace heavy metals in liquid samples
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Evaluation of open-air type electrolyte-as-cathode glow discharge-atomic emission spectrometry for determination of trace heavy metals in liquid samples

机译：用于测定液体样品中痕量重金属的露天型阴极阴极辉光放电原子发射光谱法的评价

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摘要

Electrolyte-as-cathode glow discharge-atomic emission spectrometry (ELCAD-AES) has been used for on-line determination of trace heavy metals in tap and drinking waters and fresh milk. The fundamental characteristics are: pH of electrolytes; discharge current; discharge gap shown influenced the plasma stability; and the intensity of emission lines emitted from different elements of solution. A stable discharge plasma which significantly improved the sensitivity was achieved when approximately 1.6 kV, several tens of milli-amperes current and a few millimeters discharge gap between the Pt rod anode and acidified electrolyte cathode in atmospheric air pressure were applied. Although the OH band dominates the solution spectra between wavelenths of 300 and 700 nm, nine elements including Pb and Cu have been determined from freshly collected unspiked tap and drinking waters and fresh milk. The limits of detection (LOD) of Hg, Pb, Cd, Cu, Na and K were obtained as 0.001-0.08 mg/l. The open-air ELCAD has used for the first time for Hg, Cd, Na and K detection and an improved LOD of Pb was found compared to reported values. The LOD values of Hg, Pb, Cd and Cu improved by more than one order of magnitude compared to closed-type ECLAD.
机译：阴极电解质辉光放电原子发射光谱法（ELCAD-AES）已用于在线测定自来水，饮用水和新鲜牛奶中的痕量重金属。基本特征是：电解质的pH值;放电电流;所示的放电间隙影响了等离子体的稳定性;以及从溶液的不同元素发出的发射线的强度。当在大气压力下施加约1.6 kV，数十毫安的电流以及在Pt棒阳极和酸化的电解质阴极之间施加几毫米的放电间隙时，可以获得稳定的放电等离子体，其显着提高了灵敏度。尽管OH谱带占据了300和700 nm波长之间的溶液光谱，但已从新鲜采集的未加标自来水，饮用水和新鲜牛奶中确定了9种元素，包括Pb和Cu。 Hg，Pb，Cd，Cu，Na和K的检出限（LOD）为0.001-0.08 mg / l。露天ELCAD首次用于检测Hg，Cd，Na和K，与报告值相比，发现Pb的LOD有所提高。与封闭式ECLAD相比，Hg，Pb，Cd和Cu的LOD值提高了一个数量级以上。

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