Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1227925 | Microchemical Journal | 2010 | 7 Pages |
Abstract
Greater sampling efficiency was obtained with liquid argon as freezing fluid and air flow rate of 150 mL minâ 1 for two hours. Best results have been obtained with preconcentration for 3 min and injection volume of 3 ml. For H2S, CH3SH and CH3S2CH3 the method showed a precision of 89%, limit of detection of 0.10 µg mâ 3 and limit of quantification 0.3 µg mâ 3. For CH3SCH3 and CS2 the corresponding values were 89%, 0.15 µg mâ 3 and 0.5 µg mâ 3 and for COS were 75%, 0.18 µg mâ 3 and 0.8 µg mâ 3 respectively. Sampling efficiency varied between 70-80% for all the RSCs. Accuracy of H2S from field measurements obtained with parallel measurements using a continuous monitor varied between 88 and 98%. The optimized methodology proved to be suitable for field measurements in urban tropical atmospheres with different characteristics.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Vânia P. Campos, Adriana S. Oliveira, LÃcia P.S. Cruz, Jomar Borges, Tania M. Tavares,