In this study, carbon microparticles (CMs) as a physical carrier to enhance the analyte transport efficiency for inductively coupled plasma mass spectrometry connected with electrothermal vaporization (ETV-ICP-MS) are proposed. Carbon microparticles mixed with samples or calibration standard solutions were dosed as a slurry into the graphite furnace. The optimization of working conditions was done for the standard solution 0.5 μg L-1 of Au and Tl. The pyrolysis and vaporization temperatures were 500 and 2700 °C for Au and 400 and 1900 °C for Tl. The optimized CMs concentration was 1 g L-1 for Au and 2.5 g L-1 for Tl. For the quantification, external calibration standard solutions were used. The result obtained for Au in the digested CRM GBW 07601 (the informatory value 2.1 ± 2 μg kg-1) was 2.2 ± 0.1 μg kg-1. The result for Tl in the digested CRM BCR 679 (the certified value 3 ± 0.3 μg kg-1) was 3.2 ± 0.2 μg kg-1 and in the slurry 2.7 ± 0.1 μg kg-1. The result for Tl in the CRM GBW 10052 (the certified value 57 ± 11 μg kg-1) was 51 ± 3 μg kg-1. The instrumental limits of detection were 0.016 ng L-1 for Au and 0.026 ng L-1 for Tl. The recoveries and repeatabilities measured on calibration standards were in the range 99-100% and 0.2-2.3% for Au and 100-111% and 2.9-6.7% for Tl.

Center of Materials and Nanotechnologies CEMNAT University of Pardubice CZ 532 10 Pardubice Czech Republic

Department of Environmental and Chemical Engineering University of Pardubice CZ 532 10 Pardubice Czech Republic

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