Abstract
A new on-line version of the gold amalgamation trap was proposed for the determination of Hg0 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 °C during the Hg0 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 Hg0 amalgamation. Experimental parameters such as carrier gas flow, Hg0 release temperature and Hg0 amalgamation time were investigated. LOD and LOQ values of 0.06 and 0.21 μg L−1 Hg0 were obtained, respectively. Precision was always better than 10%. Quantitative Hg0 recoveries (85–116%) were obtained for the spiked certified reference materials and spiked crude oil, diesel and gas condensate samples.
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