在过量锰存在下,二安替比林苯乙烯甲烷光度法测定人发中痕量铬(Ⅵ)

本文研究了在过量锰存在下,铬(Ⅵ)与二安替比林苯乙烯甲烷及吐温-80的显色反应条件,结果表明:在磷酸介质中,反应生成的紫色络合物在546um处有最大吸收,摩尔吸光系数为4.55×10~5,比尔定律范围是0～0.8μgCr(Ⅵ)/25ml,该体系可用于人发中痕量铬的测定.     

用连续电感藕合等离子体——原子发射光谱法间接测定水样中铬的形态

用连续电感藕合等离子体———原子发射光谱法间接测定水样中铬的形态许孙曲许燕编译（南方冶金学院赣州３４１０００）１实验１１装置使用Ｓｐｅｃｔｒｏｆｌａｍｅ连续电感藕合氩等离子体发射光谱仪（Ｓｐｅｃｔｒｏ，德国）测定Ｃｒ和Ｃｕ。表１为光谱测定的操作参数...     

固体进样无焰原子吸收法直接测定树叶中的铬

设计了一种简便,实用的固体进样装置,进行无焰原子吸收测定树叶中的痕量铬.建立了一种准确快速测定树叶中微量元素的方法,适合于常规环境试样分析.特证质量0.9Pg/0.0044A,回收率95-98％,变异系数5.1-5.7％.     

原子吸收法测定废水中的铬（Ⅵ）

在pH<1的溶液中,用甲基异丁酮(MIBK)与磷酸三丁酯(TBP)混合作为萃取剂,萃取废水中的铬时,六价铬的分配比为108.6,而三价铬几乎不被萃取。用原子吸收分光光度计测定有机相中的六价铬具有很好的选择性,且干扰少,灵敏度高。工作曲线的最佳浓度范围是:0.04～4.00mg/L。     

糠醇生产中铜铬废触媒资源化研究

对已有的糠醇生产中产生的废渣回收工艺进行了改进。将糠醛液相加氢生产糠醇产生的废渣于130℃真空蒸馏回收废渣中的有机混合物，经过精馏获得糠醇与糠醛；剩余的固体废触媒与纯碱混合，经反射炉焙烧、水浸取、掺加石灰除硅、过滤得到铬酸钠水溶液；剩下的粗氧化铜经碱溶除铬、溶于硝酸得到硝酸铜溶液；将铬酸钠溶液、硝酸铜溶液按一定比例混合，加氨水搅拌，分离出的沉淀经传统方法焙烧活化、造粒制得新催化剂，回用于糠醛液相加氢生产糠醇。有机物、铬组分和铜组分的回收率均在90％以上。     

化工铬渣在炼铁烧结中的应用

本文介绍了化工铬渣用于炼铁烧结配料的工艺，对烧结和炼铁技术经济指标的作用以及对环境的影响等方面的情况，为化工铬渣的利用找到了一种经济合理的方法，是跨行业综合治理环境污染问题的有效途径。     

九龙江口秋茄红树林镉铬镍元素的累积及动态

探讨了福建九龙江口秋茄红树林对重金属元素Ｃｄ、Ｃｒ、Ｎｉ的累积及动态，结果表明；该林区表层土壤（０－３０ｃｍ）深Ｃｄ、Ｃｒ、Ｎｉ元素的储量分别为２１．６０、１０９２．６３和３９０３．９０ｍｇ／ｍ＾２，秋茄植物体各部位Ｃｄ、Ｃｒ、Ｎｉ一的范围分别为０．０４４４－０．０９１２、０．０８５－０．２７５和０．３２６－１．０００μｇ／ｇ，该群落现存生物量中，Ｃｄ、Ｃｒ、Ｎｉ元素的储量分别为１１６６．８５、３     

关于含低CODcr、高CL-稀土废水中CODcr的测定方法探讨

本文通过实验研究，提出用低铬法(0．0250mol/L)测定稀土废水中的CODCr，该方法测定结果和高铬法比较误差较小，准确度提高，并给出了低铬法测定稀土废水中CODCr时，HgSO4最佳使用量。     

Intensification of adsorption process by using the pyrolytic char from waste tires to remove chromium(Ⅵ) from wastewater

Pyrolysis has the potential of transforming waste into valuable recyclable products. Pyrolytic char (PC) is one of the most important products from the pyrolysis of used tires. One of the most significant applications for pyrolytic char recovered is used for the removal of Cr( Ⅵ ) in the wastewater effluent to control waste by waste. The surface chemistry properties of surface element distribution/concentration and chemical structure were examined for the pyrolytic char and the commercial activated carbon(CAC) respectively. The results showed that surfaces of PC possesses a large amount of ester and hydrocarbon graft, whereas there are mainly carbon functional components of C-OH, C=O and COOH on the surface of CAC. Therefore the surface electronegativity of PC is lower than that of CAC in the water. The repulsive interactions between the surfaces of PC and the negatively charged Cr（Ⅵ ) ion are weaker than that of CAC,which results in an intensification of the adsorption process by the utilization of PC. The adsorption isotherms of Cr( Ⅵ ) ion on the two kinds of carbons were determined experimentally. The larger adsorption amount on the PC in the case of Cr( Ⅵ ) may be attributed mainly to its special surface micro-chemical environment. The mechanism of the removal Cr( Ⅵ ) from aqueous solution was assumed to be the integration of adsorption and redox reaction. The adsorption was the rate-controlled step for Cr( Ⅵ ) removal. The adsorption of Cr( Ⅵ )was identified as pseudo-second-order kinetics. The rate constants of adsorption were evaluated.