AI Article Synopsis
- The study investigates how different sediment drying methods affect the geochemical fractions of mercury (Hg) in sediments, which is important for understanding its mobility and bioavailability.
- Significant differences were found in Hg concentrations between fresh and dried sediments, with oven-drying and air-drying increasing certain soluble fractions while decreasing organo-chelated fractions due to factors like oxidation and Hg loss from volatilization.
- Freeze-drying had the least impact on Hg fraction analysis and helps reduce analytical errors compared to other drying methods.
Article Abstract
The geochemical fractions of heavy metals in sediments are crucial indexes for their mobility and bioavailability evaluations. However, different drying processes of sediment pretreatment could change metal geochemical fractions, especially for Hg, which is potentially volatile. In this study, the influence of pretreatment methods including oven-drying, air-drying, freeze-drying, and fresh sediments on the analysis of Hg fractions in sediments was investigated. Results showed that remarkable differences of Hg concentration were observed between fresh sediments and dried pretreatment sediments (P < 0.05). Briefly, the concentrations of the water-soluble and human stomach acid-soluble fractions in oven-dried and air-dried sediments generally showed significant increasing trends compared with those in the fresh sediments, while the organo-chelated fraction exhibited significant decreasing trends. The cause of this phenomenon was primarily the oxidation of organic matter, aging process, and the diffusion of Hg into micropores. The significant loss was also observed at elemental Hg fraction due to its volatilization effect. The freeze-drying posed minor influence on changes of Hg fraction analysis compared with oven-drying and air-drying. Moreover, the total Hg concentrations in pretreated sediments showed a decline of varying degrees compared with those in fresh sediments ascribing to the volatilization of elemental Hg. Finally, Pearson correlation analysis further confirmed that freeze-drying could minimize the errors of the Hg fraction analysis in sediments.
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| http://dx.doi.org/10.1007/s10661-019-7799-z | DOI Listing |
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