秦皇岛园博园湖泊中农药含量的风险评价

Risk Assessment of Pesticide Contents in Lakes in Qinhuangdao Garden Expo Park

2021年4月24日,在秦皇岛园博园湖泊水体中布设7个采样点,采集水样,采用高效液相色谱法,检测水样中6种常用于园林的农药(高效氟氯氰菊酯、代森锰锌、多菌灵、吡虫啉、毒死蜱、三唑酮)的含量,检测结果显示,水样中有高效氟氯氰菊酯、多菌灵、吡虫啉和毒死蜱4种农药,这4种农药是该园区养护树木的常用农药,农药的检出率为64%,其中,高效氟氯氰菊酯的含量最大;以水体中的高效氟氯氰菊酯含量为研究对象,在2021年7月12日至13日和9月19日两次降雨过程的前、后,在该园区北湖的10个采样点,采集水样,测定水样中的高效氟氯氰菊酯含量,对高效氟氯氰菊酯含量进行风险评价。研究结果表明,7月12日至13日的暴雨过后,北湖中与使用农药的树木分布区较近和水流速度大的6个采样点水体中的高效氟氯氰菊酯含量明显增加;7月12日至13日暴雨前、后,北湖10个采样点水体中的高效氟氯氰菊酯含量都对水生生物具有高生态风险;9月19日中雨前、后,北湖5个采样点水体中的高效氟氯氰菊酯含量对水生生物具有高生态风险,其它5个采样点水体中的高效氟氯氰菊酯含量对水生生物具有中生态风险;两场降水前、后,北湖10个采样点水体中的高效氟氯氰菊酯含量对人群健康危害风险等级都为低风险。

Water samples from 7 sampling sites in Qinhuangdao Garden Expo Park were collected on April 24,2021,and the contents of 6 kinds of pesticides(lambda-cyhalothrin,difenocarb,carbendazim,imidacloprid,chlorpyrifos and triadimefon)commonly used in the gardens in the water samples were detected by high performance liquid chromatography.The test results showed that the water samples of the park only contained 4 kinds of pesticides(lambda-cyhalothrin,carbendazim,imidacloprid and chlorpyrifos),which are the common pesticides in the park,and the detection rate of pesticides was 64%,among which,the content of lambda-cyhalothrin was the largest.To study the content of lambda-cyhalothrin in water bodies,water samples were collected at 10 sampling points in North Lake of the park before and after two rainfall processes on July 12-13 and September 19,2021,to determine the content of lambda-cyhalothrin in water samples and to evaluate the distribution of lambda-cyhalothrin content for risk.The results of the study showed that the content and distribution range of lambda-cyhalothrin in the waters of North Lake increased with the increase of rainfall intensity;the runoff generated by the heavy rainfall from July 12 to 13 spread lambda-cyhalothrin to the most water body of the North Lake,and the ecological risk level of lambda-cyhalothrin content in the water body of the North Lake to aquatic organisms was highest;before and after the middle rainfall on September 19,the ecological risk level of the contents of lambda-cyhalothrin in the water bodies of the 5 sampling points of North Lake to aquatic organismswas highest,and the content of lambda-cyhalothrin in the water bodies of other 5 sampling points had medium ecological risk to aquatic organisms,and the runoff generated by the middle rainfall made lambda-cyhalothrin spread to part of the water body of North Lake;before and after the two rainfall processes,the risk level of lambda-cyhalothrin in the water bodies of North Lake to the health hazard of the population was low.