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361.
ICP-AES法测定煤矸石中的Ni、Fe、Mn、Cr 总被引:1,自引:0,他引:1
取1.000g矸石样品于聚四氟乙烯坩埚中,加入5mLH2O2放置过夜,加6mL浓HCl,4mL浓HNO3,在微波炉中消解至近干,再加2mLHF,继续消解至粘稠状,用温热稀HCl溶解残渣,转入50mL容量瓶中,加1%HNO3定容,用ICP-AES法测定煤矸中Ni、Fe、Mn、Cr。在选定的测定条件下,检出限分别为0.013mg/L、0.0044mg/L、0.0014mg/L和0.0069mg/L;精密度的相对标准偏差分别为2.9%、3.4%、3.1%、2.1%;准确度实验铬的回收率在97.5%~106.0%之间。 相似文献
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论述了目前我国环境与经济之间的关系现状及环境优化对经济增长所做出的贡献,说明环境优化经济增长是转变经济增长方式国家战略的必然要求,提出规划环评是促进环境优化经济的重要手段。 相似文献
364.
Practical performance and its efficiency of arsenic removal from groundwater using Fe-Mn binary oxide 总被引:3,自引:0,他引:3
A treatment unit packed by granular adsorbent of Fe-Mn binary oxide incorporated into diatomite (FMBO(1:1)-diatomite) was studied to remove arsenic from anaerobic groundwater without any pre-treatment or post-treatment. The raw anaerobic groundwater containing 35-45 μg/L of arsenic was collected from suburb of Beijing. Arsenic(III) constituted roughly 60%-80% of the total arsenic content. Approximately 7,000 bed volumes (ratio of efluent volume to adsorbent volume) treated water with arsenic concentration below 10 μg/L were produced in the operation period of four months. The regeneration of FMBO(1:1)-diatomite had been operated for 15 times. In the first stage, the regeneration process significantly improved the adsorption capacity of FMBO(1:1)-diatomite. With increased loading amount of Fe-Mn binary oxide, the adsorption capacity for arsenic decreased 20%-40%. Iron and manganese in anaerobic groundwater were oxidized and adsorptive filtrated by FMBO(1:1)-diatomite efficiently. The final concentrations of iron and manganese in efluents were nearly zero. The continued safe performance of the treatment units proved that adsorbent FMBO(1:1)-diatomite had high oxidation ability and exhibited strong adsorptive filtration. 相似文献
365.
Humic substances are ubiquitous redox-active organic compounds of environment. In this study, experiments were conducted to determine the reduction capacity of humic acid in the man-ix of bromate and Fe(Ⅲ) solutions and the role of Fe(Ⅲ) in this redox process. The results showed that the humic acid regenerated Fe(Ⅱ) and reduced bromate abiotically. The addition of Fe(Ⅲ) could accelerate the bromate reduction rate by forming humic acid-Fe(Ⅲ) complexes. Iron species acts as electron mediator and catalyst for the bromate reduction by humic acid, in which humic acid transfers electrons to the complexed Fe(Ⅲ) to form Fe(Ⅱ), and the regenerated Fe(Ⅱ) donate the electrons to bromate. The kinetics study on bromate reduction further indicated that bromate reduction by humic acid-Fe(Ⅲ) complexes is pH dependent. The rate decreased by 2-fold with the increase in solution pH by one unit. The reduction capacity of Aldrich humic acid was observed to be lower than that of humic acid or natural organic matter of Suwanne River, indicating that such redox process is expected to occur in the environment. 相似文献
366.
Dechlorination of disinfection by-product monochloroacetic acid in drinking
water by nanoscale palladized iron bimetallic particle 总被引:1,自引:0,他引:1
Nanoscale palladized iron(Pd/Fe)bimetallic particles were prepared by reductive deposition method.The particles were characterized by X-ray diffraction(XRD),X-ray fluorescence(XRF),scanning electron microscope(SEM),transmission electron microscope(TEM),and Brunauer-Emmett-Teller-nitrogen(BET-N_2)method.Data obtained from those methods indicated that nanoscale Pd/Fe bimetallic particles containedα-Fe~0.Detected Pd to Fe ratio by weight(Pd/Fe ratio)was close to theoretical value. Spherical granules with di... 相似文献
367.
构建了一种基于升流式厌氧污泥床反应器(UASB)的微生物燃料电池(MFCs),利用UASB高效去除COD能力及连续进样方式,获得稳定电能输出。考察了水力停留时间、进液方式、电极材料、离子交换膜种类、溶液离子强度等因素对于MFCs性能的影响。实验结果表明:在水力停留时间6h、连续进液、高纯石墨板电极以及均相阳离子交换膜条件下,连续运行3个月,放电功率稳定在145mW/m^2,开路电压0.78V,放电电流最高可达321mA/m^2。 相似文献
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针对线性年龄相关剂量学程序PLEIADES ( Program for Linear Age - dependent Dosimetry)计算贫铀辐射危险存在的影响因素较多、系数不确定性大、使用不便的问题,基于ICRP生物动力学模型,采用美国原子管理委员会编制的放射性物质工具箱中提供的典型条件下铀的各同位素剂量转换系数,分析了不同背景下剂量的影响因素,给出了贫铀的辐射危险概率的简化计算方法,并同PLEIADES的结果相比较。分析表明两者结果吻合较好,该方法原理简单,使用方便,适合于对贫铀辐射危险的估算。 相似文献