Cr元素对铁合金抗热强碱磨损腐蚀性能的影响

测定了10钢、20Cr5、20Cr11含铬铸钢和185Cr13、295Cr26高铬铸铁在85℃的质量浓度为303g／L的NaOH溶液中的腐蚀速率、电位一时间曲线、静态及冲刷条件下的电化学曲线。实验结果显示．铬钢和铬铸铁在静态浸泡中，电位都经历过高-低-高的变化，表明其腐蚀历程相似。在静态条件下，含铬量高的铬钢和铸铁腐蚀失重大于含铬量低的材料。在冲刷条件下，由失重法获得的总失重和由极化曲线计算得到的腐蚀失重均显示含铬高的铸铁抗磨损腐蚀性能优于含铬量相对低的铸铁。增加铬含量．对合金抗热强碱的纯腐蚀有不利的影响，但却有利于材料抗热强碱介质的磨损腐蚀。     

β修正分光光度法测定水中铍

在十六烷基吡啶存在下，Ｂｅ（Ⅱ）与铬天青Ｓ（ＣＡＳ）作用生成棕红色络合物。本文研究了用β修正光光度法分析水中痕量Ｂｅ。通过对样品测定，相对标准偏差ＲＳＤ≤５％，铍加标回收率为９０．７％－１０７％，铍最低检测浓度５μｇ／Ｌ，该方法适合工业废水等各环境水体分析。     

电镀污泥中Cr^3＋的处理

为了消除电镀污泥中Ｃｒ＾３＋的污染，将铬污染泥掺入含有煤渣的砖坯中，经高温锻烧砖坯的过程中，碳将其中的Ｃｒ＾３＋转变为金属铬。可除掉Ｃｒ＾３＋对环境的污染。此法不需单独加煤渣，在制砖工艺中已加入煤渣作内燃，只是添加一定量的含铬污泥。因此，工艺简单，操作方便，不需增加设备，且对砖的抗压强度有益无害。该法可在所有产生铬污泥的行业中推广应用。     

液膜法法去除水中Cr（Ⅵ）的研究

本文采用液膜法去除并回收水中Ｃｒ。对膜溶剂，载体，稳定剂的种类及用量进行了优选。用优选出的膜配方制成认处理含Ｃｒ水样，对制膜速度及时间，混合速度及时间，内外水相ＰＨ，膜内比及乳水比等操作条件对Ｃｒ去除率的影响进行了研究。     

泥炭吸附铬离子的机理研究

我国是世界上泥炭资源较丰富的国家之一。本文选择了在我国具有代表性的低位草木泥炭－新宾泥炭，着重研究了这种泥炭吸附水溶液中三价和六价铬离子的机理。     

二溴硝基偶氮氯膦光度法测定水中微量铬

本文研究了二溴硝基偶氮氯膦与铬(Ⅲ)的显色反应.在pH为3.2的缓冲介质中,铬(Ⅲ)与二溴硝基偶氮氯膦生成1:2的配合物,其最大吸收波长为624nm,摩尔吸光系数ε=1.1×10~4L·mol~(-1)·cm~(-1)铬(Ⅲ)量在0～20μg/25ml范围内符合比尔定律.该法可用于环境水样的分析.     

Experimental study on Cr(Ⅵ) reduction by Pseudomonas aeruginosa

Investigation on Cr( Ⅵ ) reduction was conducted using Pseudomonas aeruginosa. The study demonstrated that the Cr(Ⅵ) canbe effectively reduced to Cr( Ⅲ ) by Pseudomonas aeruginosa. The effects of the factors affecting Cr( Ⅵ ) reduction rate including carbon source type, pH, initial Cr(Ⅵ) concentration and amount of calls inoculum were thoroughly studied. Malate was found to yield maximum biotransformation, followed by succinate and glucose, with the reduction rate of 60.86%, 43. 76% and 28.86% respectively. The optimum pH for Cr( Ⅵ ) reduction was ?.0, with reduction efficiency of 61.71 % being achieved. With the increase of initial Cr(Ⅵ) concentration,the rate of Cr(Ⅵ) reduction decreased. The reduction was inhibited strongly when the initial Cr(Ⅵ) concentration increased to 157 mg/L. As the amount of cells inoculum increased, the rate of Cr( Ⅵ ) reduction also increased. The mechanism of Cr( Ⅵ ) reduction and final products were also analysed. The results suggested that the soluble enzymes appear to be responsible for Cr (Ⅵ) reduction by Pseudomonas aeruginosa, and the reduced Cr( Ⅲ ) was not precipitated in the form of Cr(OH)3.     

尿中铬的原子吸收法测定

通常,铬以Cr~(3+)和Cr~(6+)两种价态存在。Cr~(3+)是维持人体内葡萄糖平衡及脂肪和蛋白质代谢作用所必须的微量元素;而Cr~(6+)却对人体有毒害作用。分别测定人体中Cr~(3+)和Cr~(6+),对生命科学十分重要。水和尿液中Cr~(3+)和Cr~(6+)的测定方法,多有报道。Mulins用Fe(OH)_3共沉淀和溶剂萃取法,分别测定了天然水中Cr~(3+)和Cr~(6+)。本文用Fe(OH)_3共沉淀法分离尿中Cr~(3+)和Cr~(6+),以电热原子吸收法测定其含量。并对最