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首页> 外文期刊>Environmental toxicology and chemistry >AGRICULTURAL PESTICIDES AND SELECTED DEGRADATION PRODUCTS IN FIVE TIDAL REGIONS AND THE MAIN STEM OF CHESAPEAKE BAY, USA
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AGRICULTURAL PESTICIDES AND SELECTED DEGRADATION PRODUCTS IN FIVE TIDAL REGIONS AND THE MAIN STEM OF CHESAPEAKE BAY, USA

机译：美国CHESAPEAKE BAY的五个潮汐地区和主要部位的农业农药和精选的降解产品

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摘要

Nutrients, sediment, and toxics from water sources and the surrounding airshed are major problems contributing to poor water quality in many regions of the Chesapeake Bay, an important estuary located in the mid-Atlantic region of the United States. During the early spring of 2000, surface water samples were collected for pesticide analysis from 18 stations spanning the Chesapeake Bay. In a separate effort from July to September of 2004, 61 stations within several tidal regions were characterized with respect to 21 pesticides and 11 of their degradation products. Three regions were located on the agricultural Delmarva Peninsula: The Chester, Nanticoke, and Pocomoke Rivers. Two regions were located on the more urban western shore: The Rhode and South Rivers and the Lower Mobjack Bay, including the Back and Poquoson Rivers. In both studies, herbicides and their degradation products were the most frequently detected chemicals. In 2000, atrazine and metolachlor were found at all 18 stations. In 2004, the highest parent herbicide concentrations were found in the upstream region of Chester River. The highest concentration for any analyte in these studies was for the ethane sulfonic acid of metolachlor (MESA) at 2,900 ng/L in the Nanticoke River. The degradation product MESA also had the greatest concentration of any analyte in the Pocomoke River (2,100 ng/L) and in the Chester River (1,200 ng/L). In the agricultural tributaries, herbicide degradation product concentrations were more strongly correlated with salinity than the parent herbicides. In the two nonagricultural watersheds on the western shore, no gradient in herbicide concentrations was observed, indicating the pesticide source to these areas was water from the Bay main stem.
机译：切萨皮克湾许多地区的水质，主要来自美国中大西洋地区的重要河口，营养成分，沉积物和来自水源及周围空气流域的有毒物质是导致水质差的主要问题。在2000年初春，从切萨皮克湾的18个站点收集了地表水样品进行农药分析。在2004年7月至9月的另一项工作中，对多个潮汐区域内的61个气象站进行了表征，涉及21种农药及其11种降解产物。农业德尔马半岛上分布着三个地区：切斯特河，楠提克河和波科莫克河。有两个地区位于城市西部沿海地区：罗得河和南河以及下莫布杰克湾，包括后河和波克森河。在两项研究中，除草剂及其降解产物都是最常检测到的化学物质。 2000年，在所有18个站点中发现了阿特拉津和异丙甲草胺。 2004年，在切斯特河上游地区发现了最高的母体除草剂浓度。在这些研究中，所有分析物的最高浓度是楠迪克河中的甲草胺（MESA）的乙磺酸（2,900 ng / L）。在Pocomoke河（2,100 ng / L）和切斯特河（1,200 ng / L）中，降解产物MESA的分析物浓度也最高。在农业支流中，除草剂降解产物的浓度与母体除草剂的盐分相关性更大。在西海岸的两个非农业流域中，未观察到除草剂浓度的梯度，这表明这些区域的农药来源是来自海湾主干的水。

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