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在測定机油及添加剂中的鋅、钡和鈣时,可用二乙三胺五乙酸来代替乙二胺四乙酸。仲裁測定时,用三氟乙酸分解法;一般控制时,則可用簡单的Sch(?)niger氧化分解法。在pH=10时,以鉻黑T为指示剂測定全部金属。鋅用氰化鉀絡合后,以二乙三胺五乙酸继續滴定。鋇以硫酸鋇形式分离并加乙醇后,以二乙三胺五乙酸继续滴定。通常情况下,鈣可用差数算出;但是如果濃度低时,可用另一样品在沉淀掉硫酸鋇及将鋅絡合后进行測定。从添加剂及商品油料的分析表明,酸分解及二乙三眩五乙酸滴定是一种准确的仲裁方法,
Diethylenetriaminepentaacetic acid may be used instead of ethylenediaminetetraacetic acid in the determination of zinc, barium and calcium in engine oils and additives. Determination of arbitration, with trifluoroacetic acid decomposition method; general control, you can use a simple Sch (?) Niger oxidation decomposition method. At pH = 10, all metals were measured with Chrome Black T as an indicator. After zinc is complexed with potassium cyanide, titration is continued with diethylenetriaminepentaacetic acid. After barium was separated from barium sulfate and ethanol was added, titration was continued with diethylenetriaminepentaacetic acid. Normally, calcium can be calculated as the difference; however, if the concentration is low, another sample can be used after precipitation of barium sulphate and complexation of zinc. From the analysis of additives and commercial oilseeds, acid decomposition and titration of pentaacetic acid are an accurate arbitration method,