我厂在日常分析中的银管纯度测定,以往一直沿用氯化银重量法,但该法分析时间长,操作不慎,往往结果偏高。部颁标准是采用杂质差减法或直接比浊法,但前者要分析许多杂质,更不适合于一般工厂的试验室分析,后者掌握难度较大,配制试剂复杂。为此,我们对常规的硫氰酸盐容量法进行了改进:为减少滴定误差,特制 I plant in the daily analysis of the purity of silver tube, silver chloride in the past has been using gravimetric method, but the analysis of the law for a long time, the operation is not careful, often high results. Ministerial standard is the use of impurity subtraction method or direct nephelometry, but the former to analyze many impurities, but not suitable for general laboratory analysis of the laboratory, the latter grasp more difficult to prepare complex reagents. For this reason, we have improved the conventional thiocyanate capacity method: to reduce the titration error, special