Carbon microparticles as a physical carrier for ETV-ICP-MS.
Talanta
; 204: 555-560, 2019 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-31357333
ABSTRACT
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⯵gâ¯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 1â¯gâ¯L-1 for Au and 2.5â¯gâ¯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⯱â¯2⯵gâ¯kg-1) was 2.2⯱â¯0.1⯵gâ¯kg-1. The result for Tl in the digested CRM BCR 679 (the certified value 3⯱â¯0.3⯵gâ¯kg-1) was 3.2⯱â¯0.2⯵gâ¯kg-1 and in the slurry 2.7⯱â¯0.1⯵gâ¯kg-1. The result for Tl in the CRM GBW 10052 (the certified value 57⯱â¯11⯵gâ¯kg-1) was 51⯱â¯3⯵gâ¯kg-1. The instrumental limits of detection were 0.016â¯ngâ¯L-1 for Au and 0.026â¯ngâ¯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.
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MEDLINE
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En
Ano de publicação:
2019
Tipo de documento:
Article