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研究了在ｐＨ９．４的硼砂介质中，Ｍｎ（Ⅱ）－ＯＰ－５－Ｂｒ－ＰＡＤＡＰ红色络合物形成的适宜条件和络合物的稳定性等．锰含量在（０～１）ｍｇ／Ｌ范围内服从Ｂｅｅｒ定律．其回归方程为：Ａ＝０．０５９９２Ｃ＋３．４×１０－２，（ｒ＝０．９９８６）．摩尔吸光系数ε＝１．０６×１０５．测定６次相对偏差小于３．０％．加标回收率在９６％～９８％．该法用于茶叶中锰的测定，结果令人满意．
The suitable conditions for the formation of red complex of Mn (Ⅱ) -OP-5-Br-PADAP and the stability of the complex in borax medium pH9.4 were studied. The manganese content obeys Beer’s law within the range of (0-1) mg / L. The regression equation is: A = 0.05992C + 3.4 × 10-2, (r = 0.9986). Molar absorption coefficient ε = 1.06 × 105. Determination of six relative deviations of less than 3.0%. Spike recovery was 96% ~ 98%. The method for the determination of manganese in tea, the results are satisfactory.