文献类型：期刊文献

英文题名：Ultra-sensitive determination of inorganic arsenic valence by solution cathode glow discharge-atomic emission spectrometry coupled with hydride generation

作者：Guo, Xiaohong[1,2];Peng, Xiaoxu[2];Li, Qing[2];Mo, Jiamei[2];Du, Yiping[1];Wang, Zheng[2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, 1295 Dingxi Rd, Shanghai 200050, Peoples R China

年份：2017

卷号：32

期号：12

起止页码：2416

外文期刊名：JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY

收录：;EI(收录号：20174904505000);WOS:【SCI-EXPANDED(收录号:WOS:000416809200010)】；

基金：This work was supported by the Instrument Development Project of the Chinese Academy of Sciences (No. YZ201539), the National Natural Science Foundation of China (No. 21175145), the Function Development Project of Chinese Academy of Sciences (No. Y67YQ2120G), and Shanghai technical platform for testing and characterization on inorganic materials (No. 14DZ2292900).

语种：英文

外文关键词：Atoms - Chlorine compounds - Fluorescence spectroscopy - Hydrides - Spectrometry - Cathodes - Sodium Borohydride

摘要：A simple and ultra-sensitive method for the determination of inorganic arsenic valence was developed by solution cathode glow discharge atomic emission spectrometry (SCGD-AES) coupled with hydride generation (HG). Arsenic was converted into volatile hydrides by the reaction with NaBH4 and HCl, after which they were delivered and subsequently injected into the near-anode region of the SCGD, where they were detected directly by atomic emission spectrometry (AES). The detection limit (DL) for arsenic was improved by four orders of magnitude compared to the single SCGD-AES process. The main operational parameters and sources of potential interference that affect the determination of arsenic were thoroughly studied. Under optimal conditions, the DLs for As(III) and As(V) were both calculated to be 0.3 mu g L-1. Repeatability, expressed as the relative standard deviation of the spectral peak height, was 2.5% (n = 11) for a 0.1 mu g L-1 arsenic solution. The proposed method was validated by the determination of a certified reference material (NIST SRM 1568a) and was applied to the real rice samples, where the measurement results obtained by the HG-SCGD-AES method were in good agreement with the reference values or values from hydride generation atomic fluorescence spectrometry.