采用酚藏花红分光光度法测定矿渣中的微量汞,对反应条件进行了实验及优化,得最佳测定条件为:测定波长535 nm,H2SO4浓度为3.0 mol/L,NaBr浓度为0.02 mol/L,并且在室内漫射光条件下,溴汞酸-酚藏花红缔合物在溶剂中的稳定时间为120 min之内,汞含量在0～20μg/mL范围内服从比尔定律,检出限为1.09×10-3μg/mL。该条件下测得矿渣中的汞含量为2.5μg/g,加标回收率在97.95%～98.57%之间,测得其相对标准偏差(n=6)≤3.0%。该方法可用于矿渣中微量汞的测定。 The optimum conditions for the determination of trace mercury in slag by phenol redmine spectrophotometry were as follows: the wavelength was 535 nm, the concentration of H2SO4 was 3.0 mol / L, the concentration of NaBr was 0.02 mol / L , And the stomatal stability of the bromeliacetin-phenanthrene complex in the solvent was 120 min under the diffuse light indoors, Beer’s law was obeyed in the range of 0 ~ 20 μg / mL, the detection limit was 1.09 × 10-3 μg / mL. Under this condition, the mercury content in the slag was 2.5μg / g, the recoveries were between 97.95% and 98.57%, and the relative standard deviations (n ​​= 6) ≤3.0% were measured. The method can be used for the determination of trace mercury in slag.