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261.
泉州市规划区大气污染物总量分配可行性分析 总被引:1,自引:0,他引:1
合理的污染物排放总量分配是保证城市发展和环境保护的相协调的重要条件,以可预测实现的环境质量目标;符合可持续发展战略,在保护环境的前提下又可为经济,社会发展提供必要的空间;符合区域目标总量控制为3个基本要求,论证城市功能区划、产业结构特征,污染源特点的泉州规划区大污染总量分配方案的合理性和可行性。 相似文献
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以氰化钠污染事故的处置为例介绍了监测方法,对如何做好突发性环境污染事故的处置与监测提出对策. 相似文献
265.
宁波地区海产品中汞污染现状研究 总被引:7,自引:0,他引:7
采用冷原子吸收(荧光)法测定了宁波不同地区的各种海产品中总汞和甲基汞含量,总体属轻度及中等污染水平,工业轻发达地区的海产品内总汞和甲基汞的含量较高,不同种类海产品因食性不同,在食物链中所处位置不同,表现为贝壳类>肉食性类>杂食性类>植食性类>藻类和水草,无鳞鱼类>有鳞鱼类;海产品中不同部分污染水平表现为内脏>头部>肌肉;海水<底泥<海产品。除个别样品接近国家标准外,其余都符合我国食品卫生标准。 相似文献
266.
BACKGROUND: Each year millions of liters of fire-retardant chemicals are applied to wildfires across the nation. Recent laboratory studies with long-term fire-retardant chemicals indicate a significant photoenhanced toxicity of products containing sodium ferrocyanide corrosion inhibitors. Our objective of this study was to determine the toxicity of fire-retardant chemicals to fathead minnows during exposure in experimental outdoor streams. METHODS: Stream tests were conducted to determine the potential toxicity of a pulse of exposure as might occur when fire retardant chemical is rinsed from the watershed by rainfall. Two artificial 55-meter experimental streams were dosed with different concentrations of Fire-Trol GTS-R, or uncontaminated for a control. Replicate groups of fathead minnows were added to screened containers (10 fish per container) and exposed to retardant chemicals in the recirculating flow of the stream for up to 6 hours. RESULTS AND DISCUSSION: Under field conditions toxicity of GTS-R only occurred in the presence of sunlight. When GTS-R was tested on sunny days, 100% mortality occurred. However, when tested during heavily overcast conditions, no mortality occurred. CONCLUSIONS: Lethal concentrations of cyanide were measured when GTS-R with YPS exposures were conducted under sunny conditions, but not under cloudy conditions, indicating that a minimum UV level is necessary to induce toxicity as well as the release of cyanide from YPS. The toxicity observed with GTS-R was likely associated with lethal concentrations of cyanide. Rainwater runoff following applications of this fire-retardant at the recommended rate could result in lethal concentrations in small ponds and streams receiving limited water flow under sunny conditions. RECOMMENDATIONS AND OUTLOOK: In addition to avoiding application to aquatic habitats, it is important to consider characteristics of the treated site including soil binding affinity and erosive properties. 相似文献
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污染减排涉及到技术、经济、管理等一系列要素和环境、经济、企业等不同部门,是一项系统工程,要实现减排目标,必须结合国情和地方实际,实施源头控制、末端治理、监督管理等三大措施与对策。 相似文献
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二氧化氯对水中无机污染物的去除效果研究 总被引:11,自引:1,他引:11
本文通过模拟水厂混凝沉淀-过滤工艺,研究了ClO2抽量和投加点对水中Fe^2+,Mn^2+,S^2-CN^-污染物的去除效果,并与液氯进行了对比,结果表明,随ClO2投量增大,去除率也增加,且ClO2效果优于液氯;后投ClO2的去除效果好于中间投和预投ClO2,且可省药,这为ClO2在饮用水中的应用提供了科学依据。 相似文献
270.
Herbert?L.?FredricksonEmail author John?Furey Jeffrey?W.?Talley Margaret?Richmond 《Environmental Chemistry Letters》2004,2(2):77-81
U.S. laws require that contaminant bioaccumulation potential be evaluated before dredged material can be recycled. Simple fugacity models, e.g. organic contaminant aqueous partition coefficient (K
oc)-derived theoretical bioaccumulation potential, are commonly used to estimate the partitioning of hydrophobic organic contaminants between sediment organic matter and organism lipid. K
oc-derived models, with or without the addition of a soot carbon term, did not accurately or consistently predict total polycyclic aromatic hydrocarbons (PAHs) and polychlorobiphenyls partitioning of eight sediments from ongoing dredging operations onto C18-coated filter paper. These models also failed to predict the partitioning of individual PAHs from these eight sediments. These data underscore the trade-offs between the ease of using simple models and the uncertainty of predicted partitioning values. 相似文献