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111.
石墨炉原子吸收光谱法测定海水中痕量铅 总被引:1,自引:0,他引:1
研究了APDC-DDTC/CCI4体系石墨炉原子吸收法测定海水中痕量Pb.在最佳务件测定海水中痕量铅与标准方法有良好的相关性(R=0.9969),统计检验表明,置信度为95%时,两方法之间没有显著差异.本法RSD%=1.1,精密度略优于标准方法,操作简便,节省时间.应用于海水中铅的分析,取得了令人满意的结果. 相似文献
112.
113.
A five-stage sequential extraction procedure was used to fractionate heavy metals (Cd, Cu, Pb, Cr, Zn, Fe, Mn, Ni, Co, As,
V and Ba) in a biosludge from the biological wastewater treatment plant of Stora Enso Oyj Veitsiluoto Mills at Kemi, Northern
Finland, into the following fractions: (1) water-soluble fraction, (2) exchangeable fraction, (3) easily reduced fraction,
(4) oxidizable fraction, and (5) residual fraction. The biosludge investigated in this study is a combination of sludge from
the primary and secondary clarifiers at the biological wastewater treatment plant. Extraction stages (2)–(4) follow the protocol
proposed by the Measurements and Testing Program (formerly BCR Programme) of the European Commission, which is based on acetic
acid extraction (stage 2), hydroxylamine hydrochloride extraction (stage 3), and hydrogen peroxide digestion following the
ammonium acetate extraction (stage 4). The residual fraction (stage 5) was based on digestion of the residue from stage 4
in a mixture of HF + HNO3 + HCl. Although metals were extractable in all fractions, the highest concentrations of most of the metals occurred in the
residual fraction. From the environmental point of view, it was notable that the total heavy metal concentrations in the biosludge
did not exceed the maximal allowable heavy metal concentrations for sewage sludge used in agriculture, set on the basis of
environmental protection of soil by European Union Directive 86/278/EEC, and by the Finnish legislation. The Ca (98.6 g kg−1; dry weight) and Mg (2.2 g kg−1; dry weight) concentrations in the biosludge were 62 and 11 times higher than the typical values of 1.6 and of 0.2 g kg−1 (dry weight), respectively, in arable land in Central Finland. The biosludge had a slightly alkaline pH (∼8.30), a high loss-on-ignition
value (∼78%) and a liming effect of 10.3% expressed as Ca equivalents (dry weight). This indicates its potential as a soil
conditioner and improvement agent, as well as a pH buffer. 相似文献
114.
针对特丁硫磷原药生产废水特点,提出了采用萃取-氧化-铝盐沉降法治理方案.并进行效益分析,结果表明,该治理方案具有良好的经济效益,社会效益和环境效益。 相似文献
115.
Urban airborne particulate: genotoxicity evaluation of different size fractions by mutagenesis tests on microorganisms and comet assay 总被引:4,自引:0,他引:4
The genotoxic effects of different size fractions of airborne particulate (Total, PM10 and PM2.5), extracted with acetone or toluene, were evaluated by: the Ames plate test (TA98 and TA100 strains, w/o S9), gene conversion and reversion (w/o endogenous metabolic activation) in the Saccharomyces cerevisiae D7 strain, and the comet assay on human leukocytes. The data on human leukocytes confirm the sensitivity of the comet assay and its applicability to assess genotoxicity in environmental samples. The PM2.5 fraction of airborne particulate generally shows the highest concentration of DNA-damaging compounds. Genotoxic response, in all the test systems applied, is highly dependent on extraction solvent used. Acetone seems to extract compounds with more similar genotoxic responses in the three test systems used than toluene extracts. Toluene appears to extract air pollutants genotoxic on yeast and leukocytes but is mainly cytotoxic on Salmonella. 相似文献
116.
117.
中国环境与生物标准参考物质中甲基汞的测定 总被引:2,自引:0,他引:2
应用了多种分离技术分离有机汞,以气相色谱电子捕获检测器测定甲基汞和乙基汞,测定了一些已经定值总汞的中国环境与生物标准参考物质及一些别国制备的标准测参考物质。采用不同分离技术,所得结果基本一致,也存在些差异。实验室之间的测定结果也很接近。建议上述物质可作为测定甲基汞和乙基汞的标准参考物质。 相似文献
118.
119.
孔雀绿萃取光度法测量微量铅的研究 总被引:1,自引:0,他引:1
研究了铅(Ⅱ)—碘化钾—孔雀绿(MG)缔合显色体系。发现在pH=4.7的HAc—NaAc缓冲溶液中,MG与PbI形成稳定的缔合物,可用苯萃取,其最大吸收峰位于625nm处,摩尔吸光系数为1.2×10 ̄5L/(mol·cm),Pb(Ⅱ)浓度在0~25μg/10ml范围内符合比耳定律,缔合物的组成比为Pb(Ⅱ):I:MG=1:4:2。应用此法测定了煤飞灰标样、茶叶、自来水中的铅含量,结果令人满意。 相似文献
120.
Olli Dahl Risto Pöykiö Hannu Nurmesniemi 《Journal of Material Cycles and Waste Management》2008,10(1):87-92
In Finland, the new limit values for heavy metals in fertilizers used in agriculture and in forestry came into force in March
2007, and for materials used as earth construction agents, in June 2006. From the utilization point of view, it was notable
that the total heavy metal concentrations (Cd, Cu, Pb, Cr, Mo, Zn, As, Ni, Ba, and Hg) in fly ash from a coal-fired power
plant were lower than those limit values. The concentrations of the easily soluble elements Ca, Mg, Na, P, and Zn in the fly
ash were between 3.5 and 35 times higher than those found in the coarse mineral soils of Finland. Fly ash is a potential agent
for soil remediation and for improving soil fertility. If inorganic materials and by-products are utilized in earthworks,
the content of harmful compounds must be low and the harmful components must be tightly bound to the matrix. Therefore, a
five-stage sequential extraction procedure was used to evaluate the extractability of different elements in fly ash into the
following fractions: (1) the water-soluble fraction, (2) the exchangeable fraction (CH3COOH), (3) the easily reduced fraction (NH2OH-HCl), (4) the oxidizable fraction (H2O2 + CH3COONH4), and (5) the residual fraction (HF + HNO3 + HCl). 相似文献