title: Upper Yellow River air concentrations of organochlorine pesticides estimated from tree bark, and their relationship with socioeconomic indices.
abstract: Organochlorine pesticide (OCP) concentrations in tree bark from the upper Yellow River region were determined. Total OCP concentrations ranged from 2.7 to 82 ng/g dw, with a mean of 20 ng/g dw. Concentrations of total (Σ) DDTs (0.49-37 ng/g dw), HCHs (0.55-4.5 ng/g dw), and HCB (0.1-1.0 ng/g dw) were much higher than the other OCPs and accounted for 89% of the ΣOCP concentrations. p,p'-DDT was the dominant member of the DDT pesticide group and β-HCH was the dominant HCH isomer. The p,p'-DDT/p,p'-DDE and α-HCH/γ-HCH ratios suggested that there were recent DDT and γ-HCH releases. OCP concentrations in the air were estimated from the tree bark, and the estimated median ΣDDTs, ΣHCHs, and HCB concentrations in the air were 0.09, 0.14, and 0.024 pg/m(3), respectively. The relationship between total OCP concentrations and socioeconomic and natural environment indices were assessed using multiple linear regression analysis, and a regression equation including all these factors was obtained. Population density and tertiary industry were the two dominant factors that appeared to affect OCP concentrations in the upper Yellow River region.
authors: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China. Electronic address: hechang010101@163.com.
authors: Chang
authors: C
authors: He
authors: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China. Electronic address: junjin3799@126.com.
authors: Jun
authors: J
authors: Jin
authors: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
authors: Bailin
authors: B
authors: Xiang
authors: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
authors: Ying
authors: Y
authors: Wang
authors: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
authors: Zhaohui
authors: Z
authors: Ma
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004777:Environment; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D024301:Plant Bark / Q000737:chemistry*; D012044:Regression Analysis; D012959:Socioeconomic Factors
chemical_list: D000393:Air Pollutants; D006843:Hydrocarbons, Chlorinated; D010575:Pesticides
keywords: North-western China; atmosphere; organohalogen; persistent organic pollutants (POPs); vegetation; willow