本文报导用金电极二次导数阳极溶出伏安法测定尿汞。H_2SO_4—KM_nO_4为尿液的消化剂,消化温度90℃左右,消化时间3小时,过量KM_4O_4用H_2O_2还原。低于20ppbHg~(2+)浓度和溶出峰高成线性关系,检出限低于0.05ppb。测定20ppbHg~(2+)时的相对标准偏差为2.5％,回收率达99％。尿中常见无机离子浓度高于3倍正常值也不干扰汞的测定。 This article reports the determination of urinary mercury using the second derivative anodic stripping voltammetry of gold electrodes. H_2SO_4-KM_nO_4 is a digestive agent for urine. The digestion temperature is about 90 ℃, the digestion time is 3 hours, and the excess KM_4O_4 is reduced with H_2O_2. Below 20ppbHg ~ (2 +) concentration and dissolution peak height linear relationship, the detection limit of less than 0.05ppb. The relative standard deviation of 20ppbHg ~ (2+) was 2.5% and the recovery rate was 99%. Urinary common inorganic ion concentrations higher than 3 times the normal value does not interfere with the determination of mercury.