研究了新显色剂7-(6-溴-2-苯并噻唑偶氮)-8-羟基喹啉-5-磺酸(6-Br-BTAQS)与锌的显色反应。该试剂与锌在弱酸性介质中形成紫色络合物,其最大吸收位于565nm处,表观摩尔吸光系数为9.6×10~4。遵守比尔定律的范围为0—12微克/25毫升锌。据此拟定了测定矿样中微量锌的方法,结果满意。 The color reaction of the new reagent 7- (6-bromo-2-benzothiazolylazo) -8-hydroxyquinoline-5-sulfonic acid (6-Br-BTAQS) with zinc was studied. The reagent forms a purple complex with zinc in a weakly acidic medium, with a maximum absorption at 565 nm and an apparent molar absorptivity of 9.6 × 10 -4. Beer’s law is observed in the range of 0-12 μg / 25 ml zinc. Based on this, a method for determination of trace zinc in ore samples was developed and the results were satisfactory.