Trace Elements in Medicine (Moscow)
2017, 18(2): 51–53
SHORT COMMUNICATION

SELENIUM FRACTIONS IN TWO FAMOUS HIGH-Se AREAS OF CHINA: ENSHI, HUBEI PROVINCE AND ZIYANG, SHAANXI PROVINCE

Huan Tian1, Zhengyu Bao2,3*, Hongyu Zhang3

1 School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
2 Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
3 Zhejiang Research Institute, China University of Geosciences, Hangzhou, 311305, China

DOI: 10.19112/2413-6174-2017-18-2-51-53 

ABSTRACT. Selenium (Se) fractions of 31 rocks/soils (Enshi and Ziyang) were analysed for better understanding Se biogeochemical cycling, assessing geological environment, utilizing Se sources and preventing Se poisoning. The Se content of Enshi rocks/soils is higher than those of Ziyang. Sulfide/selenide and elemental Se, base-soluble organic Se and residual Se are predominated in Ziyang carbonaceous slate, and the bioavailable Se is 5.12±3.60% (n=5); base-soluble organic Se, sulfide/selenide and elemental Se, and ligand-exchangeable Se are the main fractions in Enshi carbonaceous shale, and the bioavailable Se is 17.81±6.80% (n=8). The soil Se fractions present a high succession of the underlying strata. The soil bioavailable Se of Ziyang (4.17±3.35%, n=8) is lower than that of Enshi (14.14±8.43%, n=10). Thus, the Se bioavailability in geological samples is largely controlled by its fractions and species.

KEYWORDS: selenium, soil, fractions and species, bioavailability, biogeochemical province