Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 38, Issue 10, Pages 1920-1926Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3ja00207a
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A new method combining a continuous flow photochemical vapor generator (PVG) with a modified multimode sample introduction system (MSIS) is proposed for trace mercury analysis. After optimization, a low detection limit can be achieved, and the method is applicable to mercury analysis in different samples.
New hyphenation of a continuous flow photochemical vapor generator (PVG) to a modified multimode sample introduction system (MSIS) used as a gas-liquid separator and microwave plasma atomic emission spectrometry (MP-AES) was proposed for the analysis of trace mercury. The widened MSIS bottom inlet contributes to an increase in Hg0 mass transfer in the gas-liquid separator, allowing mercury determination by MP-AES. After optimizing the PVG reactor conditions and MP-AES instrument parameters, a limit of detection (LOD) of 0.25 ppb was obtained for Hg2+. The applicability of the PVG-MSIS-MP-AES method was subsequently demonstrated for trace mercury analysis in two soil CRMs - ERM-CC135a (Contaminated Brickworks soil) and CRM005 (Sewage Amended soil). A modified MSIS chamber operating with high sample flow rates was used as a novel gas-liquid separator in the MP-AES detection of trace mercury after photochemical vapor generation.
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