Abstract:This paper adopts -EDTA back titration precipitation separation method to establish the detection method of lead content Kaldor slag, discusses the influence of interference of coexisting elements and details of the operation and other factors in the samples on the test results and draw a conclusion: the amount of ammonium hydrogen fluoride 0.10g, sulfuric acid washing 5~6 times, Chen Hua 3h, 5ml, ammonia added amount of acetic acid sodium acetate buffer solution 30ml addition, boiling time was 15 ~ 20min, the recovery ranged from 99.80% to 100.20%, two of the measured results of actual samples of RSD were 0.14% (n=8) and 0.15% (n=9).