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EC50s for cadmium, copper, lead and zinc were determined for juvenile production of Folsomia candida at pH6.0, 5.0 and 4.5 in a standard laboratory test system. In contrast to most previous studies where metal toxicity was increased at low pHs, in our experiments there was no clear relationship between soil acidity and EC50-reproduction in this species. The EC50-reproduction values (μg g−1) for cadmium and zinc were similar at all three pHs (pH6.0: Cd 590, Zn 900; pH5.0: Cd 780, Zn 600; pH4.5: Cd 480, Zn 590). In contaminated field sites adjacent to primary zinc smelters, zinc is invariably present in soils at concentrations of at least 50 times that of cadmium Thus deleterious effects of mixtures of these metals on populations of Collembola in such sites can be attributed to zinc rather than cadmium. 相似文献
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印染行业清洁生产技术 总被引:3,自引:0,他引:3
论述了目前印染行业水污染的现状及原因,指出调整产业结构、应用新工艺、大力提倡节约用水、清沽生产将是印染行业实现可持续发展的必由之路。 相似文献
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将时间-活动模式与微环境空气污染物监测相结合估计儿童个体NOX暴露水平.分别在北京和青岛两市各选择3所学校监测校园环境污染物,并在每个学校选择10名儿童监测其家庭居室空气中ρ(NOX)及个体24 h NOX暴露水平,同时收集其时间-活动信息,采用时间-活动模式估计儿童的个体暴露水平.交通工具中的NOX暴露水平可通过校门口空气中ρ(NOX)和交通工具的污染水平系数(λ)估计.结果表明:利用时间-活动模式模拟的儿童个体24 h NOX暴露水平为0.041mg/m3,与调整后的个体暴露实测水平相关性较好(R=0.785,P<0.01),差值为(-0.002 6±0.013 0)mg/m3,二者的差异无统计学意义(t=0.139,P>0.05).表明采用时间一活动模式与微环境空气质量监测结果相结合方法估计的儿童NOX暴露水平与个体实际暴露水平一致. 相似文献
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