期刊
ENVIRONMENTAL POLLUTION
卷 224, 期 -, 页码 445-453出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2017.02.025
关键词
Thallium; Soil; Vegetable; Ecological risk; Steel plant
资金
- National Natural Science Foundation of China [41573008, 41203002, 41573119, 41273100, 21577093, 21207092]
- Guangdong Provincial Natural Science Foundation [2014A030313527, 2015A030313512]
- Environmental Protection Ministry of Public Welfare Research Projects [201509051]
- Guangzhou Science and Technology Programme [201510010205]
- Guangzhou Education Bureau [1201431072, 13XT02]
- High Level University Construction Project (Regional Water Environment Safety and Water Ecological Protection)
Thallium (Tl) is a highly toxic rare element. Severe Tl poisoning can cause neurological brain damage or even death. The present study was designed to investigate contents of Tl and other associated heavy metals in arable soils and twelve common vegetables cultivated around a steel plant in South China, a newly-found initiator of Tl pollution. Potential health risks of these metals to exposed population via consumption of vegetables were examined by calculating hazard quotients (HQ). The soils showed a significant contamination with Tl at a mean concentration of 1.34 mg/kg. The Tl levels in most vegetables (such as leaf lettuce, chard and pak choy) surpassed the maximum permissible level (0.5 mg/kg) according to the environmental quality standards for food in Germany. Vegetables like leaf lettuce, chard, pak choy, romaine lettuce and Indian beans all exhibited bioconcentration factors (BCF) and transfer factors (TF) for Tl higher than 1, indicating a hyperaccumulation of Tl in these plants. Although the elevated Tl levels in the vegetables at present will not immediately pose significant non-carcinogenic health risks to residents, it highlights the necessity of a permanent monitoring of Tl contamination in the steel-making areas. (C) 2017 Elsevier Ltd. All rights reserved.
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