A new on-line version of the gold amalgamation trap for interference-free determination of Hg-0 in crude oil and related products by Zeeman CV-AAS

作者：Pontes Fernanda Veronesi M; Carneiro Manuel C; Vaitsman Delmo S; Monteiro Maria Ines C^*; Neto Arnaldo A; de Souza Evelyn da M F; Tristao Maria Luiza B

来源：Journal of Analytical Atomic Spectrometry, 2012, 27(10): 1794-1798.

DOI：10.1039/c2ja30098b

A new on-line version of the gold amalgamation trap was proposed for the determination of Hg-0 in crude oil and related products prior to its detection by atomic absorption spectrometry. On-line analyses were carried out by a homemade gold amalgamation trap (GAT), heated at 120 degrees C during the Hg-0 amalgamation, coupled to a commercial mercury analyzer, containing a spectral corrector based on the Zeeman effect. The heating avoided the collection of many volatile hydrocarbons onto the trap, and the Zeeman-effect corrector avoided the interferences caused by part of the organic vapors, which were collected onto the trap during the Hg-0 amalgamation. Experimental parameters such as carrier gas flow, Hg-0 release temperature and Hg-0 amalgamation time were investigated. LOD and LOQ values of 0.06 and 0.21 mu g L-1 Hg-0 were obtained, respectively. Precision was always better than 10%. Quantitative Hg-0 recoveries (85-116%) were obtained for the spiked certified reference materials and spiked crude oil, diesel and gas condensate samples.

• 出版日期2012