Geo-chemical fractionations of arsenic and lead in the surface sediments of Thuy Trieu lagoon, Khanh Hoa province

Le Hung Phu; Dao Viet Ha; Pham Hong Ngoc; Nguyen Hong Thu; Le Trong Dung; Vo Tran Tuan Linh

doi:10.15625/1859-3097/19/4A/14589

Author affiliations

Authors

Le Hung Phu Journal of Marine Science and Technology
Dao Viet Ha
Pham Hong Ngoc
Nguyen Hong Thu
Le Trong Dung
Vo Tran Tuan Linh

DOI:

https://doi.org/10.15625/1859-3097/19/4A/14589

Keywords:

Arsenic, lead, fractionations, sediment, Thuy Trieu lagoon.

Abstract

The sequential extraction method of Tessier et al. was applied to identify the phase associations of As and Pb in the surface sediment of Thuy Trieu lagoon. The results showed that these two metals were mainly found in the residual fractions. Meanwhile, the carbonate fractions stayed at the lowest portions. Levels of arsenic and lead as Fe-Mn oxide fractions were higher than those as organic fractions and exchangeable fractions. Exchangeable fractions and carbonate fractions of two elements seemed to increase in rainy season. Generally, the mobility of Pb was higher than that of As. In the sediments of Thuy Trieu lagoon, Pb levels cannot currently cause adverse effects on the ecosystems. On the contrary, the risk of As was assessed as moderate level.

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