Rain Deposition of Pesticides in Coastal Waters of the South Atlantic Bight
Rain Deposition of Pesticides in Coastal Waters of the South Atlantic Bight
复制标题
南大西洋湾沿岸水域农药的雨水沉积
DOI：
10.1021/es9806231
复制
发表时间：
1999
影响因子：
11.4
通讯作者：
T. Shaw
中科院分区：
文献类型：
--
作者：
Henry Alegria;T. Shaw
在沿海地区发生重大风暴事件后，立即在南大西洋海湾的表层水域测量了目前使用的杀虫剂浓度，该风暴事件在沿海地区造成了显著的降雨(200−300毫米)。在近海检测到一股淡水(盐度至少比周围36.2GMT的咸水低2‰)。同时进行的一项研究确定，羽流变得清新是降雨的结果。与羽毛外的地表水相比，阿特拉津、异丙甲草胺和氟乐灵在新鲜羽流内的浓度有所增加(约为2−6)，这为这些杀虫剂在雨中的沉积提供了直接证据。计算的降雨端元浓度高于当地河流端元。在2−为期3天的活动中，估计在新鲜羽流中沉积的杀虫剂数量从130千克到490千克阿特拉津，从95千克到120千克异丙甲草胺，从10千克到27千克氟乐灵。这些值约占估计值的4%−10%、3−5%和1−3%。
Concentrations of currently used pesticides were measured in surface waters of the South Atlantic Bight immediately after a major storm event that deposited significant rainfall (200−300 mm) in the coastal region. A plume of freshened water (salinity at least 2‰ lower than surrounding 36.2‰ salinity waters) was detected offshore. A concurrent study determined that the freshened plume was the result of rainfall. Concentrations of atrazine, metolachlor, and trifluralin were enriched inside the freshened plume (by a factor of approximately 2−6) as compared to surface waters outside the plume, providing direct evidence of rain deposition of these pesticides. Calculated rain end-member concentrations were higher than local river end-members. Estimated quantities of pesticides deposited in the freshened plume during the 2−3-day event ranged from 130 to 490 kg of atrazine, from 95 to 120 kg of metolachlor, and from 10 to 27 kg of trifluralin. These values represent approximately 4−10%, 3−5%, and 1−3% of the esti...