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以同多阴离子〔Mo_7O_(24)〕~(-6)形式存在的Mo(VI),在温热的硫酸(0.1 mol/L)介质中可被异烟肼(INH)还原为一种蓝色的溶液——同多“钼蓝”。这种蓝色溶液在695 nm处有最大吸收,摩尔吸光系数为6.25×10~3L/mol·cm。利用此溶液吸收度与INH 浓度的比例关系,作者提出了用分光光度法测定微量INH 的新方法。测定方法:于50 ml 试管中先后加入0.5～10.0 ml 的INH 溶液(含31.5～625μg 的
Mo (VI) in the form of polyanion [Mo_7O_ (24)] ~ (-6) can be reduced to is blue by isoniazid (INH) in warm sulfuric acid Solution - the same number of “molybdenum blue.” This blue solution has the maximum absorption at 695 nm with a molar absorptivity of 6.25 × 10 -3 L / mol · cm. Utilizing the ratio of the absorbance of this solution to the concentration of INH, the authors propose a new method for the determination of trace INH by spectrophotometry. Determination: In 50 ml tube was added 0.5 ~ 10.0 ml INH solution (containing 31.5 ~ 625μg of