秋冬季台湾海峡西部海域大气颗粒物中有机氯农药的污染特征及入海通量

Characteristics and dry deposition fluxes of organochlorine pesticides (OCPs) in atmospheric particulate matters in Western Taiwan Strait during autumn and winter

    摘要
  • 摘要: 通过采集台湾海峡西岸厦门岛秋、冬两季的近海大气颗粒物样品，分析20种有机氯农药（OCPs）的污染特征及可能来源，并估算OCPs干沉降入海通量。结果显示，厦门岛大气颗粒物中OCPs主要为DDTs、HCHs和Methoxychlor。季节变化上，受中国北方陆地污染气团来源的影响，冬季OCPs各化合物的浓度高于秋季。2006至2008年，OCPs浓度呈上升趋势，可能受到该时期内厦门灰霾日数明显增加导致大气总悬浮颗粒物含量增长的影响。与国内主要城市区域相比，OCPs浓度处于较低水平，与背景区域的浓度水平相当。通过分子标志物示踪污染物来源显示，DDTs、氯丹和硫丹主要为历史残留，而HCHs主要受到工业HCHs污染的影响。秋季和冬季，OCPs的大气干沉降通量分别为3.49 ng/（m2·d）和9.25 ng/（m2·d），按照台湾海峡海域覆盖面积（63000 km2）估算，秋季和冬季大气颗粒物中OCPs通过干沉降入海通量分别为20.03 kg和52.45 kg。

     

    Abstract: To explore the OCP pollution characteristics of atmospheric particles, possible sources and dry deposition fluxes, 20 OCP compounds were examined in autumn and winter from 2006 to 2008 in the Western Taiwan Strait (Xiamen island, Fujian Province).The results showed that DDTs, HCHs and Methoxychlor were the main component of OCPs in the atmospheric particles.The concentrations of OCP compounds in winter were higher than autumn, which is influenced by the air mass sources during winter in Northern China.Compared with other areas, the average levels of OCP compounds in the atmospheric particles of Xiamen island, which is similar to the levels of background areas.Source apportionment indicated that DDTs, Chlordanes and Endosulfans were mainly historical residue, and the HCHs was mainly effected by industrial HCHs.The total dry deposition flux of OCPs to Xiamen island was 3.49 ng/m2/d and 9.25 ng/m2/d in winter and autumn, respectively, and the average input to the adjacent waters was 20.03 kg and 52.45 kg in autumn and winter, respectively.

     

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