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  • Title: Occurrence, phase distribution and depositional intensity of dichlorodiphenyltrichloroethane (DDT) and its metabolites in air and precipitation of the Pearl River Delta, China.
    Author: Yue Q, Zhang K, Zhang BZ, Li SM, Zeng EY.
    Journal: Chemosphere; 2011 Jul; 84(4):446-51. PubMed ID: 21497878.
    Abstract:
    Concentrations of dichlorodiphenyltrichloroethane (DDT) and its metabolites (designated as DDTs, the sum of o,p'- and p,p'-DDT, o,p'- and p,p'-DDE, and o,p'- and p,p'-DDD) in air and precipitation from the Pearl River Delta (PRD) of China were determined. Total concentrations of DDTs in air (gas+particle) and precipitation (dissolved+particle) were 170 ± 120 pg m(-3) and 940 ± 180 pg L(-1) for Dongguan (rural) and 240 ± 120 pg m(-3) and 790 ± 140 pg L(-1) for Shunde (rural), respectively, while they were 1550 ± 640 pg L(-1) in precipitation from Guangzhou (urban). Log-transformed partition coefficients between air and particulate organic matter (log K(oa)(')) of p,p'-DDT, p,p'-DDE, p,p'-DDD, o,p'-DDT, o,p'-DDE, and o,p'-DDD were 9.64 ± 0.58, 10.07 ± 0.56, 9.90 ± 0.76, 10.06 ± 0.66, 10.02 ± 0.72, and 10.13 ± 0.57, respectively; while those between water and particulate organic matter (log K(om)(')) were 6.58 ± 0.66, 6.36 ± 0.53, 6.01 ± 0.62, 6.41 ± 0.42, 5.98 ± 0.76, and 5.95 ± 0.66, respectively. Total washout ratios by bulk rainfalls ranged from 4600 for o,p'-DDT to 54,000 for p,p'-DDT. Estimated average dry particle and wet depositional intensities in the PRD were 2.1 × 10(-6) and 1.6 × 10(-6)gm(-2)y(-1).
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