TY - JOUR
T1 - Thallium geochemical fractionation and migration in Tl-As rich soils
T2 - The key controls
AU - Wei, Xudong
AU - Wang, Jin
AU - She, Jingye
AU - Sun, Jing
AU - Liu, Juan
AU - Wang, Yuxuan
AU - Yang, Xiao
AU - Ouyang, Qi'’en
AU - Lin, Yuyang
AU - Xiao, Tangfu
AU - Tsang, Daniel C.W.
N1 - Funding Information:
The work was supported by the National Natural Science Foundation of China (No. 41873015 , 41830753 and 41773011 ), the Guangdong Provincial Natural Science Foundation ( 2021B1515020078 , 2021A1515011588 and 2014A030313527 ), Scientific Research Projects in Colleges and Universities of Guangzhou Education Bureau, Guangzhou, China ( 201831803 ), and the “Challenge Cup” Undergraduate Program (team leader: Yuxuan Wang).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/8/25
Y1 - 2021/8/25
N2 - Thallium (Tl) pollution caused by mining and processing of Tl-enriched ores has become an increasing concern. This study explored the geochemical fractionation and vertical transfer of Tl in a soil profile (200 cm) from a representative Tl-As mineralized area, Southwest China. The results showed that the soils were heavily enriched by Tl and As, with concentration ranging from 3.91–17.3 and 1830–8840 mg/kg (6.79 and 2973 mg/kg in average), respectively. Approximately 50% of Tl occurred in geochemically mobile fractions in the topsoil, wherein the reducible fraction was the most enriched fraction. Further characterization using LA-ICP-MS and TEM revealed that enriched Tl and As in soils were mainly inherited from the weathering of mine tailing piles upstream. XPS characterization indicated that Fe oxides herein may play a critical role in the oxidation of Tl(I) to Tl(III) which provoked further adsorption of Tl onto Fe oxides, thereby facilitating Tl enrichment in the reducible fraction. The findings highlight that the pivotal role of Fe oxides from mineralized area in the co-mobility and migration of Tl and As in the depth profile.
AB - Thallium (Tl) pollution caused by mining and processing of Tl-enriched ores has become an increasing concern. This study explored the geochemical fractionation and vertical transfer of Tl in a soil profile (200 cm) from a representative Tl-As mineralized area, Southwest China. The results showed that the soils were heavily enriched by Tl and As, with concentration ranging from 3.91–17.3 and 1830–8840 mg/kg (6.79 and 2973 mg/kg in average), respectively. Approximately 50% of Tl occurred in geochemically mobile fractions in the topsoil, wherein the reducible fraction was the most enriched fraction. Further characterization using LA-ICP-MS and TEM revealed that enriched Tl and As in soils were mainly inherited from the weathering of mine tailing piles upstream. XPS characterization indicated that Fe oxides herein may play a critical role in the oxidation of Tl(I) to Tl(III) which provoked further adsorption of Tl onto Fe oxides, thereby facilitating Tl enrichment in the reducible fraction. The findings highlight that the pivotal role of Fe oxides from mineralized area in the co-mobility and migration of Tl and As in the depth profile.
KW - Geochemical fractionation
KW - LA-ICP-MS
KW - Metal/metalloid speciation
KW - Mine tailings contamination
KW - Tl-As in soil
UR - http://www.scopus.com/inward/record.url?scp=85104890578&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.146995
DO - 10.1016/j.scitotenv.2021.146995
M3 - Journal article
AN - SCOPUS:85104890578
SN - 0048-9697
VL - 784
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 146995
ER -