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在pH=5～6的弱酸性介质中,铬青R与铝生成紫色络合物(λ_(max)=535毫微米)。加入溴化十六烷基吡啶(CPB)后,生成红紫色三元络合物(λ_(max)=590毫微米)。本文探讨了该三元络合体系应用于测定润滑油中微量铝的基本条件。试验证明,其灵敏度较高,ε_(590)=6.9×10~4。本文还研究了在铁、铜等阳离子干扰下的测定情况,在铜含量为2微克/25毫升、铁含量为10微克/25毫升时,相时误差小于10%。该三元络合体系在铝含量为0～2微克/25毫升范围内服从比尔定律。本法可不经分离,直接测定润滑油中微量铝。已应用于监测柴油机用润滑油中的铝含量,结果满意。
Chromium R forms a purple complex with aluminum (λ max (max) = 535 nm) in weakly acidic media at pH = 5-6. After addition of cetylpyridinium bromide (CPB), a magenta ternary complex was formed (λ max (max) = 590 nm). This article discusses the ternary complex system used to determine trace aluminum in lubricating oil basic conditions. Experiments show that its sensitivity is high, ε_ (590) = 6.9 × 10 ~ 4. This paper also studied the determination of iron, copper and other cationic interference conditions, the copper content of 2 micrograms / 25 ml, iron content of 10 micrograms / 25 ml, the phase error is less than 10%. The ternary complex system obeys Bill’s law in the aluminum content range of 0-2 μg / 25 ml. This method can be separated without direct determination of trace aluminum in lubricating oil. Has been used to monitor the aluminum content of diesel engine lubricating oil, with satisfactory results.