共查询到11条相似文献,搜索用时 31 毫秒
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基于污染指数与ArcGIS的聊城市耕地OCPs污染研究 总被引:1,自引:0,他引:1
按8 km×8 km网格将聊城市耕地划分为136个采样点,调查六六六(BHCs)、滴滴涕(DDTs)、艾氏剂、狄氏剂、异狄氏剂、六氯苯和七氯等7种有机氯农药(OCPs)的残留状况。采用单因子污染指数和综合污染指数法进行污染评价,以此判断OCPs的污染程度。对7种OCPs在各样点中的含量进行差异分析,并应用ArcGIS8.3,以污染评价结果为数据支持,进行OCPs污染空间分布研究。结果表明,聊城市OCPs污染程度依次为DDTs>狄氏剂>七氯>艾氏剂>BHCs>异狄氏剂>六氯苯,总体变异程度依次为DDTs>狄氏剂>异狄氏剂>BHCs>七氯>六氯苯>艾氏剂。各OCPs空间分布没有固定的变化趋势;各采样点综合污染水平存在地域差异,以临清市污染最为严重,其他各县市污染较轻。 相似文献
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水磨河流域有机氯农药污染调查及防治对策 总被引:3,自引:1,他引:3
在对水磨河流域实地勘察的基础上,用GC-ECD定量测定了乌鲁木齐市水磨河底泥中有机氯农药HCHs和DDTs的含量,以此来了解水磨河有机氯农药污染情况。结果表明,样品中HCHs和DDTs含量分别为0.107~111.690和0.476~66.512ng/g,其检出率为100%,说明该流域已经普遍受到有机氯农药污染。针对目前的污染现状提出相应的治理措施,以减轻水磨河有机氯农药的污染。 相似文献
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鞍山大气中有机氯农药的污染特征研究 总被引:2,自引:0,他引:2
布设鞍钢工业区6个点位,周边2个点位,居民区2个点位和千山对照点等11个点位,分别在采暖期和非采暖期测定大气中有机氯农药的含量,掌握了鞍山市大气中有机氯农药空间和时间变化趋势。全年有机氯农药各组分和ΣOPC浓度最高的功能区均为工业区周边,最低的功能区是千山对照点,六六六、滴滴涕和ΣOPC浓度变化趋势为工业区周边工业区居住区千山对照点,全市各功能区采暖期有机氯农药各组分和ΣOPC总浓度均高于非采暖期。 相似文献
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采集兰州西固区土壤样品,采用GC/μECD方法检测样品中有机氯农药(OCPs)污染残留,并分析调查区土壤中OCPs污染特征、来源及潜在生态风险。结果表明,8种OCPs异构体在兰州西固区土壤中的检出率均为100%,总质量比范围在18.34μg/kg~125.34μg/kg之间,平均值为54.84μg/kg;土壤中BCHs和DDTs残留质量比分别为0.742μg/kg~29.3μg/kg和10.9μg/kg~98.6μg/kg。OCPs残留以p,p'-DDT和β-BCH为主。不同采样点土壤样品中OCPs的残留量从高到低依次为路边样绿化带样树根土样菜地样。对DDTs与BCHs异构体残留组分分析发现,调查区土壤中残留的BCHs主要源于历史应用,而DDTs源于近期污染。 相似文献
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MINGHUA ZHANG SHU GENG SUSAN L. USTIN KENNETH K. TANJI 《Environmental monitoring and assessment》1997,45(2):101-127
Geographic Information Systems (GIS) and statistical methodswere used to identify the major factors affecting pesticideleaching in groundwater from agricultural fields in TulareCounty, California. Residues of bromacil, diuron, and simazineincreased in groundwater during the 1980s. Bromacil, diuron,and simazine contamination were positively correlated to cropdiversity and water demand. Diuron and simazine were positively correlated to groundwater depth and negatively correlatedto soil water-holding capacity. DBCP concentration in groundwater was related to the crop coverage. The Goss model wasused to examine soil-pesticide interactions and a PesticideContamination Index (PCI) was developed. Areas having highleaching potentials were mainly associated with citrus andorchards and coarse-textured sandy soils along the SierraNevada foothills, while areas having low leaching potentialswere associated with field crops and clay soils of the southwest region. The PCI was largest for DBCP during the 1980s,suggesting that it was the most significant contaminant before1977 when it was widely used; however, wells were not testedfor this pesticide during that period. Twelve years after DBCPwas banned, it was still the most significant health riskcontaminant. Spatial maps showing the distribution of leachingpotentials and soil interactions for these pesticides canprovide useful information to regulatory and planning agenciesfor land use planning and pesticide management. 相似文献