Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7640550 | Microchemical Journal | 2018 | 8 Pages |
Abstract
This paper describes the application of a method for the direct speciation of Hg in sediment samples by thermal desorption using a Direct Mercury Analyzer®. The different thermal behavior of the Hg species allowed direct chemical speciation by DMA. The set of temperature steps was as follows: 50â¯Â°C, 100â¯Â°C, 150â¯Â°C, 200â¯Â°C, 250â¯Â°C, 300â¯Â°C, 400â¯Â°C, 500â¯Â°C, 600â¯Â°C and 700â¯Â°C. Sediment samples presented total Hg concentrations varying over a range of 36 to 1996â¯Î¼g·kgâ1, with 78% of the samples being over of the TEL (threshold effect level). According to the speciation analysis, a prevalence of oxidized Hg was observed. This method was efficient, simple and adequate for determining the Hg speciation in sediment samples. The great advantage is that the method does not require pretreatment of the samples, and it is applicable to homogeneous solid samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
PatrÃcia Sueli Rezende, Nayara Carolinne Silva, William Douglas Moura, Cláudia Carvalhinho Windmöller,