Abstract：By the comparison between electrode potential of interference substance and E(I2/I-), the error source of calibration blank test in the determination of copper content by iodometric methd could be classified into three types. The influence of various interference types on determination results was analyzed. By calculation of calibration blank, it was found that the deviation of determination results caused by different interfering types was not only related to the sample blank and calibration blank, but also related to the consumed volume of standard solution for calibrating sodium thiosulfate standard titration solution and titrating sample solution. The limitation of blank test in GB/T 3884.1-2000 iodometric method was discussed from two aspects including error sources and calculation of calibration blank.The influence of interference elements on determination results could not be effectively eliminated by only sample blank correction without calibration blank correction. The deviation of determination results may be positive or negative.
刘美东，丁仕兵，周忠信，刘稚. 碘量法测定铜精矿中铜含量的空白试验探讨[J]. 冶金分析, 2011, 31(12): 67-70.
LIU Mei-dong, DING Shi-bing, ZHOU Zhong-xin, LIU Zhi. Discussion on blank test in the determination of copper in copper concentrates by iodometric method. , 2011, 31(12): 67-70.
