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应用流动注射(FIA)分光光度法测定钨还未见报道。根据在阳离子表面活性剂溴化十六烷基三甲基铵(CTMAB)存在时,于酸性介质中,二溴苯基萤光酮(DBPF)与W(Ⅵ)生成一种溶于水的红色络合物。据此,本文用一个标准溶液,应用FIA梯度技术,建立测定钨的FIA方法。方法的准确度和精密度均较好,分析速度达到每小时100个样品。在室温下测定钨,具有一定的灵敏度和较好的选择性。单标准梯度稀释建立工作曲线原理由FIA基本原理可知,试样分散带的响应曲线(图1)每一点都存在浓度信息,且浓度成梯度分布。对图1所示的分散带,若假定C~(mux)即为所配制试样的原始浓度(因标准溶液和待分析样品溶液都经过相
The use of flow injection (FIA) spectrophotometric determination of tungsten has not been reported. Based on the presence of the cationic surfactant cetyltrimethylammonium bromide (CTMAB), dibromophenylfluorone (DBPF) and W (VI) are produced in an acidic medium to form a water-soluble red Complex. Accordingly, this paper uses a standard solution, the application of FIA gradient technology to establish the FIA method for the determination of tungsten. The accuracy and precision of the method are good, the analysis speed of 100 samples per hour. Determination of tungsten at room temperature, with a certain sensitivity and better selectivity. Single-standard gradient dilution to establish the principle of working curve FIA basic principle shows that the sample dispersion zone response curve (Figure 1) there is concentration information at each point, and the concentration gradient distribution. For the dispersion shown in Fig. 1, assuming that C ~ (mux) is the original concentration of the prepared sample (because both the standard solution and the sample solution to be analyzed pass through the phase