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采用盐酸消解样品,用火焰原子吸收光谱法测定电镀废水中高浓度的锡的质量浓度,方法简单可靠。通过实验样品的分析,验证了方法的准确度和精密度。该方法干扰少,数据准确,适合废水分析。 相似文献
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孙震 《中国环境管理干部学院学报》2014,(5):70-73
运用氢化物发生-原子荧光法测定废气中锡的含量,选择了更高效、安全的硝酸-双氧水电热板消解体系对样品进行前处理,调节最佳仪器参数进行测定。研究表明:在0-10μg/L线性范围内,曲线相关系数可以达到0.999 6,方法检出限为0.003μg,加标回收率在92.7%-95.9%之间,RSD≤2.1。氢化物-原子荧光法测定废气中的锡,方法灵敏度高,干扰少,线性范围宽,操作简单、快捷。 相似文献
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根据污染源现场调研结果,结合现有污染控制工艺所能达到的技术水平,建议污水排放标准中As浓度由现国家排放标准的0 5mg/L调整为0 1mg/L;Pb不变为1 0mg/L。大气污染物排放标准中As和Pb不变为1 0mg/L。大气污染物排放标准As和Pb的浓度限值分别是为0 5mg/m3和0 7mg/m3。 相似文献
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本文以广西大厂锡石-硫化物矿区巴里尾矿库的富碳酸盐尾矿(堆放了20余年)作为研究对象,采用BCR三步提取法研究Zn、Cd、Pb和As的化学形态分量以及其总含量在该尾矿铅垂剖面中的分布,并结合尾矿的结构构造、次生和原生矿物成分及其变化等分析,探讨在氧化/酸化条件下富碳酸盐尾矿中重金属的释放机制。研究结果表明:(1)尾矿下层原尾矿中重金属主要以稳定或较稳定的残渣态(As、Pb、Zn、Cd)、氧化物结合态(Pb)及硫化物结合态(Zn、Cd)形式赋存。在酸水淋滤作用下,原尾矿中重金属的释放顺序为Cd≈ZnPbAs;(2)尾矿上部厚层状氧化硬层(厚度1~1.5m)中,Zn、Cd以酸可溶态大量富集,具有较强的迁移性;As、Pb主要以残渣态以及氧化物结合态赋存,其迁移性较差。因此,富含碳酸盐的硫化物尾矿经过氧化作用具有释放多种重金属的潜能。由于这类尾矿中各重金属的赋存状态存在差异性,因此对其迁移性及环境效应须具体分析。 相似文献
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Antimony-doped tin oxide(ATO) nanoparticles with an average size of ~ 6 nm were prepared by co-precipitation and subsequent heat treatment. Graphitic carbon nitride(g-CN)/ATO hybrid nanocomposite was designed by the combination of thermally synthesized g-CN and ATO nanoparticles by ultrasonication. The materials were characterized using N2 adsorption/desorption(BET), X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), transmission electron microscopy(TEM) and Fourier transform infrared spectroscopy(FTIR). A mixture of five volatile organic compounds(VOCs, chloroform, benzene, toluene, xylene and styrene) was used to compare the adsorption capacity of the samples. The adsorption capacity of ATO nanoparticles was improved by the addition of g-CN. Experimental data showed that, among the five VOCs,chloroform was the least adsorbed, regardless of the samples. The g-CN/ATO showed nearly three times greater adsorption capacity for the VOC mixture than pure ATO. The unchanged efficiency of VOC adsorption during cyclic use demonstrated the completely reversible adsorption and desorption behavior of the nanocomposite at room conditions. This economically and environmentally friendly material can be a practical solution for outdoor and indoor VOC removal. 相似文献
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