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Dechlorane Plus in house dust from E‐waste recycling and urban areas in South China: Sources, degradation, and human exposure
Author(s) -
Wang Jing,
Tian Mi,
Chen SheJun,
Zheng Jing,
Luo XiaoJun,
An TaiCheng,
Mai BiXian
Publication year - 2011
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.587
Subject(s) - environmental science , waste recycling , municipal solid waste , environmental chemistry , photodegradation , chemistry , waste management , environmental engineering , organic chemistry , engineering , photocatalysis , catalysis
Dechlorane Plus (DP) was measured in house dust from e‐waste recycling and from urban and rural areas of South China, with geometric mean concentrations of 604, 14.5, and 2.89 ng/g, respectively. Dechlorane Plus in house dust in the e‐waste area originated from e‐waste recycling activities, whereas household appliances served as a major source of DP in urban house dust. The isomer ratios ( f anti ) of DP in most dust samples from the e‐waste area were significantly lower than those in the urban and rural dust samples and the commercial mixture. Several [−1Cl + H] and [−2Cl + 2H] dechloro‐DPs were identified in house dust from the e‐waste area, and an a‐Cl 11 DP was qualified with concentrations of <55.1 ng/g. Photolytic degradation experiments were conducted by exposing anti‐DP, syn‐DP, and commercial DP solutions to ultraviolet (UV) light. The slight difference in isomeric half‐life derived by photodegradation, as well as the lower f anti values in the e‐waste combusted residue, suggest a significant influence of isomer‐specific thermal degradation of DP during e‐waste burning on isomer composition in house dust in the e‐waste area. The average estimated daily intakes (EDIs) of DP via house dust ranged from 0.06 to 30.2 ng/d for adults and 0.14 to 121 ng/d for toddlers in the studied area. The average EDIs of a‐Cl 11 DP for adults and toddlers in the e‐waste area were 0.07 and 0.18 ng/d, respectively. Environ. Toxicol. Chem. 2011;30:1965–1972. © 2011 SETAC