期刊
MICROCHEMICAL JOURNAL
卷 95, 期 2, 页码 213-221出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.microc.2009.12.004
关键词
Dual-mode sample introduction system; Ultrasonic nebulizer (USN); Analytical samples; Chemical vapor generation (CVG); Trace elements; Microwave induced plasma-optical emission spectrometry (MIP-OES)
资金
- Committee for Scientific Research, Poland [COST/48/2006]
The analytical potential of a coupled continuous-microflow ultrasonic nebulizer dual capillary system (mu-USN/DCS)-Ar/He mixed gas microwave induced plasma-optical emission spectrometry (MIP-OES) has been evaluated for the purpose of determination of hydride forming elements (As, Bi, Ge, Sb, Se, Sn) and a vapor element (Hg) A univariate approach and the simplex optimization procedure were used to achieve optimized conditions and derive analytical figures of merit. Analytical performance of the ultrasonic nebulization system was characterized by determination of the limits of detection (LODs) and precision (RSDs) with the mu-USN/DCS observed at a 15 mu L min(-1) flow rate At flows of <= 15 mu L min(-1). solvent loading in the plasma is sufficiently low to make desolvation unnecessary. The experimental concentration detection limits for simultaneous determination, calculated as the concentration giving a signal equal to three times of the standard deviation of the blank (LOD, 3 sigma(blank) criterion, peak height) were 1 2, 54, 6.3, 1 8, 3.3, 24 and 30 ng mL(-1) for As, Bi, Cc, Sb, Se, Sn and Hg. respectively The method offers relatively good precision (RSD ranged from 8 to 11%) for liquid analysis and microsampling capability. Interference effects by transition metals have been shown to be corrected by the addition of thiourea, as a pre-reducing agent and masking agent The accuracy of the method was verified using certified reference materials (DOLT-2, GBW 07302, SRM 2710, and SRM 1643e) and by the aqueous standard calibration technique. The measured contents of elements in reference materials were in satisfactory agreement with the certified values (C) 2009 Elsevier B V All rights reserved
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