Abstract: The synthesis and purification of a new colour reagent l-(5'-bromo-2'-pyridyl)-5-(4/-nitrophenyl)-3-(2'-Furyl ) formazane were investigated. This reagent combines with zinc ions in the presence of nonionic surfactant Twcen-80 in a buffer solution of pH 8.0-10.0 to form a blue-green complex. The complex has an maximum absorption at 688nm with a molar absorptivity of 5.96×10⁴l·mol^-1·cm^-1. Beer's law is obeyed in the range of 0-4.2μg/10ml for Zn(Ⅱ). The method has been applied to the spectrophotometric determination of micro-amount zinc in ores, with good results.