排序方式: 共有19条查询结果,搜索用时 15 毫秒
11.
上海市郊销售使用农药的环境毒理评价 总被引:3,自引:0,他引:3
调查了上海市郊1994年的农药销售使用量,并对其进行了农药排毒系数和农药使用危险性的环境毒理评价。结果表明,1994年上海市郊农药总销售用量为2418.64t,总排毒系数为35.43×10~6t/a,销售使用农药的LD_(50)为68.3mg/kg,接近我国高毒农药LD_(50)的界限(50mg/kg)。农药总用量最高的是南汇县,最低的是宝山区;排毒系数最高的也是南汇县,最低的是崇明县和浦东新区。从环境毒理角度看,上海市郊销售使用农药的结构很不合理,存在高效农药比例小,农药急性毒性高,使用危险性程度较高,及水溶性农药比例较大等问题。 相似文献
12.
介绍了10种农药在14种作物上的消解动态,结果表明,不同类型农药的消解速度是有差异的。其消解速度,有机磷>拟除虫菊酯>有机氯,百菌清与DDT相近。同一农药在不同作物上的消解速度也有明显差异,主要与作物比表面积、生长系数等因素有关。农药在设施作物上的消解速度较露地作物缓慢,且残留浓度呈先上升后下降的动态变化。农药在贮藏作物上的消解速度相当慢,这与其特殊的环境条件有关。 相似文献
13.
14.
Getahun T Mengistie E Haddis A Wasie F Alemayehu E Dadi D Van Gerven T Van der Bruggen B 《Environmental monitoring and assessment》2012,184(10):6337-6345
As one of cities in the developing countries, a rapid population growth and industrial activities pose many environmental challenges for Jimma city, Ethiopia. One aspect of urban growth posing a threat on sustainable development is poor solid waste management, which results in environmental pollution. The purpose of this study is to evaluate the quantity, composition, sources of waste generated, their current disposal practices, and to recommend appropriate management technologies. The total waste generated daily in Jimma city was ca. 88,000 kg, and the average per capita generation rate was 0.55?±?0.17 kg/capita/day. Eighty-seven percent of the waste was produced by households and 13% by institutions, and a negligible fraction (0.1%) was generated by street sweepings. During the rainy season, 40% more waste was generated than in the dry season because of the increased availability of agricultural food product. Further analysis showed that biodegradable organic waste constitutes 54% by weight with an average moisture content of 60% that falls within the required limits for composting. The nonbiodegradable components constitute 46% of which 30% of it was nonrecyclable material. Only 25% of the community uses municipal containers for disposal at the selected landfill site. Fifty-one percent of the households disposed their waste in individually chosen spots, whereas 22% burned their waste. Finally 2% of households use private waste collectors. The socioeconomic analysis showed that higher family income and educational status is associated more with private or municipal waste collection and less with the application of backyard or open dumping. These insights into generated waste and management practice in Jimma city allow making suggestions for improved collection, treatment, and disposal methods. A primary conclusion is that the biodegradable waste is a major fraction having suitable properties for recycling. As such an economic benefit can be obtained from this waste while avoiding the need for disposal. 相似文献
15.
16.
上海市郊4种地表径流及稻田水中的污染物浓度 总被引:12,自引:2,他引:12
测定了水田、旱田、村、镇4种地表径流中的污染物浓度,以及稻田渗漏水和稻田水中的污染物浓度。测定的污染物种类主要有:总悬浮物,SS、总氮、总磷、CODcr,CODMn及微生物浓度等。测定结果表明,除稻田渗漏水以外,4种地表径流水中的污染物浓度均高于上海市郊环境地面水浓度,其中以村径流的污染物浓度最高,另外,施肥后的稻田水中氮浓度很高,施肥后的暴雨会导至严重氮污染。 相似文献
17.
18.