title: Residue, temporal trend and half-life time of selected organochlorine pesticides (OCPs) in surface soils from Bacninh, Vietnam.
abstract: Selected organochlorine pesticides (p,p'-DDT, p,p'-DDE, p,p'-DDD, alpha,beta,gamma,delta-HCH) were analyzed in the surface soils of Bacninh, Viet Nam. Forty representative soil samples were collected from Bacninh town and three surrounding districts. SigmaDDT concentrations ranged from <0.02 to 160.86 ng g(-1) dry weight, whereas SigmaHCH concentrations ranged from <0.05 to 9.54 ng g(-1) dry weight. The half-life times of SigmaDDT and SigmaHCH are 6.7 and 4.9 years, respectively. The decreasing trends of SigmaDDT and SigmaHCH levels during the period from 1992 to 2006 are observed. There is no recent input of DDT and HCH in the study area.
authors.affiliation: Hanoi Water Resources University, 175 Tay Son Street, Hanoi, Vietnam. vuductoan2001@yahoo.com
authors.forename: Vu Duc
authors.initials: VD
authors.lastname: Toan
authors.forename: Vu Duc
authors.initials: VD
authors.lastname: Thao
authors.forename: Jürg
authors.initials: J
authors.lastname: Walder
authors.forename: Cao The
authors.initials: CT
authors.lastname: Ha
mesh_terms: D004784:Environmental Monitoring / Q000379:methods; D006207:Half-Life; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D013997:Time Factors; D014744:Vietnam
chemical_list: D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D010575:Pesticides; D012987:Soil; D012989:Soil Pollutants