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通过氢氧化镝与Cr(III)离子的共沉淀来分离Cr(III)、C(rⅥ),并测定总含铬量的方法应用于自来水样本中。Cr(III)离子经该方法可定量回收,而C(rⅥ)离子的回收值则低于10%。实验研究了影响定量沉淀因素,包括氢氧化镝的量和pH值,离心速度和定量沉淀实验的取样体积。没有发现碱金属、碱土金属和其他过渡金属离子对待测离子的分析产生阻碍。本实验的检测极限(k=3,N=15)分别为Cr(III)0.65g/L和C(rⅥ)0.78g/L。实验测试方法的有效性由参照物对比
The method of separating Cr (III) and C (r VI) by coprecipitation of dysprosium hydroxide with Cr (III) ions and determining the total chromium content was applied to tap water samples. The Cr (III) ions can be recovered quantitatively by this method while the C (rVI) ions have a recovery of less than 10%. The effects of quantitative precipitation factors, including the amount and pH of dysprosium hydroxide, the centrifuge velocity, and the sample volume for quantitative precipitation experiments were experimentally studied. No alkali, alkaline earth and other transition metal ions have been found to impede the analysis of the ions to be measured. The limit of detection (k = 3, N = 15) for this experiment were 0.65 g / L for Cr (III) and 0.78 g / L for C (rVI). The effectiveness of the experimental test method is compared by reference