Passive air sampling of organochlorine pesticides in a northeastern state of India, Manipur

来源 :环境科学学报(英文版) | 被引量 : 0次 | 上传用户:walkonair
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Thirty-six polyurethane foam disk passive air samplers (PUF-PAS) were deployed over a year during January to December, 2009 at three locations, i.e., Imphal (urban site), Thoubal (rural site) and Waithou (alpine site) of Manipur, to assess the seasonal local atmospheric emission of selected organochlorine pesticides (OCPs). The average concentration of HCHs monitored at mountain site during hot season (Mar, Apr, and May) and rainy seasons (Jun, Jul, Aug, and Sep) were 403 and 349 pg/m3, respectively. DDTs had a high concentration with 384 pg/m3 at rural site and 379 pg/m3 at urban site during hot seasons. Endosulfans and chlordane were found high in concentration during hot seasons (260 pg/m3) and low during retreating monsoon seasons (44 pg/m3) at rural site. Most of the OCPs concentrations were high during cultivation period. The OCP concentrations of rainy season were highly correlated (p < 0.01) with OCPs of hot seasons. Further, positive correlation (p < 0.05) was also obtained between cold seasons and retreating monsoon.Principal component analysis showed a significant correlation among the four seasons and distribution pattern of OCPs in air. Back trajectory analysis by using HYPSLIT model showed a long range air transport of OCPs to the present study area. Present OCP levels at Manipur is an outcome of both local emission and also movement of air mass by long range atmospheric transport.
其他文献
In the present work, different silica-based supported cobalt (Co) catalysts were synthesized and used for CO2 hydrogenation for methanation. Different supports,
The author considers the Cauchy problem for quasilinear inhomogeneous hyperbolic systems.Under the assumption that the system is weakly dissipative,Hanouzet and
在大规模分布式系统中,节点加入与退出所产生的扰动行为对系统性能有直接影响.当前关于节点扰动的行为模型主要描述节点达到和持续时长的统计特性,同时也对节点进行分类并赋
T Toxicities(-lgEC)of 16 halogeno-benzenes against vibrio qinghaiensis(Q67)were measured systematically, and their 2D-QSAR model(R = 0.821)was established,which
高超声速再入轨迹优化问题是一类复杂的最优控制问题.采用高斯伪谱法(GPM)将再入轨迹优化问题转化为非线性规划问题(NLP),对NLP进行归一化处理后,采用SNOPI软件包求解.根据协
Jerusalem artichoke (Helianthus tuberosus L.) not just can be used for bioethanol production but may be potentially used in phytoremediation for the removal of
提出了多约束下连续体结构拓扑优化设计的K邻近(KNN)方法。首先以结构单元作为样本,将整个设计区域看作是样本空间,将连续体结构拓扑优化看作是一种对单元的模式识别;然后利
Washing using ceramic micro-filtration membranes was studied in the preparation of nano-sized TiO2 and Al203 powder precursors obtained by wet chemical methods.
Two new cucurbitane-type triterpenoids, (23E)-5 β,19-epoxycucurbita-6,23,25-triene-3β-ol (1) and (19R, 23E)-5β,19-epoxy-19-ethoxycucurbita-6,23-diene-3 β,25
In the study of solute transport in rough single fracture,the contact area is an important factor.The single fracture is defined as two categories in this artic