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利用Cu(Ⅱ)在pH=9的氨性缓冲溶液中与双环己酮草酰二踪(BCO)及乙醛反应,生成紫红色的Cu(Ⅱ)-双乙醛草酰二腙(BAO)络合物进行分光光度法测定微量铜,是灵敏度高选择性好的方法。已被建议应用于试剂、钢铁、矿石等试样中微量铜的测定。 E.Jacobsen等提出络合物的组成为Cu(Ⅱ):BAO=1:2,朱盈权等通过实验,也认为其络合比为1:2。但本文用等摩尔连续变化法、摩尔比法及改进了的平衡移动法研究这一络合物的组成,认为其络合比应为1:4。一仪器和试剂 721 分光光度计(上海第二分析仪器厂); IR-440红外分光光度计(日本岛津公司); 超级怛温水槽(上海第二五金厂); 紫金Ⅱ电子计算机(南京有线电厂); 离子交换柱,0.6×15厘米:
Cu (Ⅱ) - diacetaldehyde oxydizone (BAO) was produced by the reaction of Cu (Ⅱ) with oxalyl bisanilide (BCO) and acetaldehyde in pH = 9 ammonia buffer solution. Complex spectrophotometric determination of trace copper, high sensitivity and good selectivity. It has been suggested that the method should be applied to the determination of trace copper in the samples, such as reagents, steel and ore. E. Jacobsen et al proposed that the composition of the complex is Cu (II): BAO = 1: 2. Zhu et al. Also found that the complex ratio is 1: 2 through experiments. However, the composition of this complex was studied by equimolar continuous variation method, molar ratio method and improved equilibrium shift method. The complex ratio should be 1: 4. An instrument and reagents 721 spectrophotometer (Shanghai Second Analytical Instrument Factory); IR-440 infrared spectrophotometer (Japan Shimadzu Corporation); Super 怛 temperature sink (Shanghai No. 2 Hardware Factory); Zijin Ⅱ electronic computer (Nanjing Cable Power plant); ion exchange column, 0.6 × 15 cm: