气候变化领域集成服务门户(CCPortal): Primary emissions or environmental persistence contribute to the present DDTs: Evidence from sediment records in Tibetan lakes

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DOI	10.1016/j.jhazmat.2023.132342
	Primary emissions or environmental persistence contribute to the present DDTs: Evidence from sediment records in Tibetan lakes
	Li, Jun; Chang, Ruwen; Ban, Xiyu; Yuan, Guo-Li; Wang, Jie
发表日期	2023
ISSN	0304-3894
EISSN	1873-3336
卷号	459
英文摘要	Dichlorodiphenyltrichloroethane (DDT) compounds are still circulating the global environment even though the technical DDT has been restricted in agriculture since the last century. The persistent presence of DDTs worldwide remains uncertain, as it is unclear whether their existence is primarily due to ongoing use or the prolonged persistence in soils and sediments that result in continuous reemission into the atmosphere. The present study applied a sequential extraction procedure to determine the DDT concentrations in rapid desorption, slow desorption, and bound residue fractions in the dated sediment cores from distinct regions of Tibet. The temporal variation of total DDTs (sum of three fractions) in sediments from southern and eastern Tibet respectively revealed the different DDT usage histories in India and China mainland. Nevertheless, the current application volumes of DDT-containing products in these regions were found to decrease significantly. The reversible transformations among three fractions of DDTs with aging time was observed along sediment profile, including the back conversion from bound residue. This process may be the key driver to prolong the half-life of sediment p,p'-DDT, resulting in the persistence of secondary sources of this persistent organic pollutant in the global environment for a longer duration than previously expected.
关键词	Tibetan Plateau DDT Fraction transformation Sediment record Half-life
英文关键词	ORGANOCHLORINE PESTICIDES OCPS; PALOS VERDES SHELF; DICHLORODIPHENYLTRICHLOROETHANE DDT; ORGANIC POLLUTANTS; BIOAVAILABILITY; RESIDUES; PLATEAU; HEXACHLOROBENZENE; DEGRADATION; PATHWAYS
WOS研究方向	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:001144705100001
来源期刊	JOURNAL OF HAZARDOUS MATERIALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283557
作者单位	China University of Geosciences - Beijing; China University of Geosciences - Beijing; China Agricultural University
推荐引用方式 GB/T 7714	Li, Jun,Chang, Ruwen,Ban, Xiyu,et al. Primary emissions or environmental persistence contribute to the present DDTs: Evidence from sediment records in Tibetan lakes[J],2023,459.
APA	Li, Jun,Chang, Ruwen,Ban, Xiyu,Yuan, Guo-Li,&Wang, Jie.(2023).Primary emissions or environmental persistence contribute to the present DDTs: Evidence from sediment records in Tibetan lakes.JOURNAL OF HAZARDOUS MATERIALS,459.
MLA	Li, Jun,et al."Primary emissions or environmental persistence contribute to the present DDTs: Evidence from sediment records in Tibetan lakes".JOURNAL OF HAZARDOUS MATERIALS 459(2023).