Effect of iron plaque and selenium on mercury uptake and translocation in rice seedlings grown in solution culture

Environmental Science and Pollution Research International
Xin Bin Zhou, Ying Ying Li

Abstract

A hydroponics experiment was conducted to investigate the effect of iron plaque on root surfaces and selenium (Se) on the uptake and transfer of mercury (Hg) in rice seedlings by adding in the EDTA-Fe (0, 10, 30, 50, 70 mg Fe l-1) into the solution to produce a different amount of iron plaque outside rice root. After 24 h, the red-brown iron plaque was formed on the root surface, and the amount of iron plaques was positively correlated with the amount of Fe in the solution. The iron plaque deposited on the root surface has a strong adsorption effect on the inorganic Hg. The addition of Se could promote the adsorption of Hg2+ on the iron plaque of rice, and the introduction of Se could increase the adsorption capacity of Hg on iron plaque on average by 1.42 times. The Hg was extracted by DCB (Dithionite-citrate-bicarbonate) up to between 66.2 and 67.8% of the total Hg when the roots with iron plaque (Fe70) were incubated with the combination of 5 μmol L-1 of HgCl2 and 5 μmol L-1 of Na2SeO3 for an hour. After 3 days, the content of Hg in the iron plaque decreased to 6.3-33.9%, indicating that part of the inorganic Hg adsorbed by the iron plaque could be reabsorbed and used. Besides that, the iron plaque allowed the Hg to stay lon...Continue Reading

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Citations

May 6, 2019·Bulletin of Environmental Contamination and Toxicology·Wenli TangHuan Zhong
Nov 24, 2020·Frontiers in Plant Science·Xinbin ZhouWeiming Shi
Jul 14, 2021·Environmental Science and Pollution Research International·Thi Anh Thu TranDongli Liang
Aug 22, 2021·Ecotoxicology and Environmental Safety·Bin TangXiaoshan Zhang

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