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润滑油中金属元素的含量是重要的质量指标之一。目前,国内外的标准方法是将金属元素单个地进行测定,本文是用同一母液测定锌、钡、钙、镁。分析手续 1 称取约10克润滑油,用60毫升二甲苯(或甲苯)与正丁醇混合溶剂(1+1)分数次将试样洗入250毫升分液漏斗中,加入20毫升3N的盐酸。用振荡机(或手摇)振荡约10分钟。静置分层后将酸液放入250毫升量瓶中,再用1N的热盐酸20毫升同上述操作作重复萃取三次(注意放气),一并放入量瓶中。加2滴甲基橙指示剂,用氢氧化钠溶液(10%)调至刚变黄,并过量1～2滴,使pH值约为6,用水稀释至刻度。
The content of metal elements in lubricating oil is one of the important quality indicators. At present, the standard method at home and abroad is the determination of metal elements individually, this article is the same mother liquor determination of zinc, barium, calcium and magnesium. Analytical procedure 1 Weigh about 10 grams of lubricating oil and wash the sample in a 250 ml separatory funnel several times with 60 ml of xylene (or toluene) mixed solvent with n-butanol (1 + 1). Add 20 ml of 3N hydrochloric acid. Shake with shaker (or hand) for about 10 minutes. After standing stratified acid into 250 ml volumetric flask, and then 1N hot hydrochloric acid 20 ml with the above operation for repeated extraction three times (pay attention to deflated), together into the volumetric flask. Add 2 drops of Methyl Orange indicator, adjust to just yellowish with sodium hydroxide solution (10%), and 1 to 2 drops in excess to bring the pH to about 6 and dilute to the mark with water.