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按国家标准 GB264—77规定油溶性有机钼盐中钼含量的测定是用 EDTA 络合滴定。由于一般用于润滑油的油溶性有机钼盐添加剂中含有引起正干扰的锌,使结果偏高。为获取准确数据作者探讨了在 HAc—NH_4Ac溶液中(PH5～7),钼与醋酸铅生成钼酸铅晶形沉淀,排除干扰,获得油溶性有机钼盐中钼的含量准确数据。一、试剂1.HAc—NH_4Ac 缓冲溶液:在250ml 醋
According to the national standard GB264-77 regulations molybdenum oil-soluble organic molybdenum salt content determination is complexed with EDTA. As the oil-soluble organic molybdenum salt additives commonly used in lubricating oils contain zinc that causes positive interference, the result is high. In order to obtain accurate data, the authors discussed the formation of lead molybdate precipitate with molybdenum and lead acetate in HAc-NH_4Ac solution (PH5 ~ 7), and obtained the accurate data of molybdenum content in oil-soluble organic molybdenum salt without interference. A reagent 1. HAc-NH_4Ac buffer solution: 250ml vinegar