Optimization of pretreatment procedure for MeHg determination in sediments and its applications

Ji, X., Liu, C., Shi, J. and Pan, G. ORCID: 0000-0003-0920-3018, 2019. Optimization of pretreatment procedure for MeHg determination in sediments and its applications. Environmental Science and Pollution Research. ISSN 0944-1344

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Methylmercury (MeHg) in sediment is difficult to be determined due to its low concentration and binding compounds like sulfide and organic matter. Moreover, wet sediment samples have been suggested to behave differently from certified reference materials in MeHg analysis. Optimal pretreatment procedure for MeHg determination in sediments hasn’t been ascertained and whether the procedure could apply to sediment samples with complex matrix merits further research. This work firstly compared recovery results of five pretreatment procedures for MeHg determination using ERM-CC580. Using the optimal pretreatment procedure, recovery results were analyzed in different sediment samples after manipulation of moisture content, organic matter and acid volatile sulfide. The procedure using CuSO4/HNO3 as leaching solutions and mechanical shaking as extraction method was proved to produce the most satisfactory recovery results (100.67 ± 6.75%, mean ± standard deviation). And when moisture contents varied from 20% to 80%, average recovery results in sediment samples ranged from 100% to 125%. Furthermore, before and after the manipulation of organic matter or acid volatile sulfide, spiking recovery results varied little and were all within acceptable limit (85%~105%). Therefore, the procedure of CuSO4/HNO3-mechanical is proposed as a universal pretreatment method for MeHg determination in sediment samples with various characteristics.

Item Type: Journal article
Publication Title: Environmental Science and Pollution Research
Creators: Ji, X., Liu, C., Shi, J. and Pan, G.
Publisher: Springer-Verlag GmbH Germany
Date: 27 April 2019
ISSN: 0944-1344
5179Publisher Item Identifier
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Jill Tomkinson
Date Added: 30 Apr 2019 13:20
Last Modified: 27 Apr 2020 03:00
URI: https://irep.ntu.ac.uk/id/eprint/36362

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