Abstract: The determination of zinc with the color reaction of dithizone and ethanol was investigated in the presence of surfactant.The results show that dithizone and zinc can form a stable red complex at 590 nm in the presence of cetyltrimethylammonium bromide.The molar ration of Zn(Ⅱ)to dithizone in the complex is etimated to be 1∶2. The apparent molar absorptivity is 9.22×10~4 L·moL~(-1)·cm~(-1) at 590 nm. Beer's law is obeyed in the zinc concentration range of 7.5～3.0 μg/50mL.This proposed method can...