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测定汽油中四乙铅及铅水含量的现行方法是先用盐酸分解乙液化汽油中的四乙铅,然后用铬酸盐容量方法测定盐酸抽取物中的铅。Ⅰ.试剂进行试验时必需下列特殊试剂:(一般实验室仪器药品在外): (1)0.05n硫代硫酸钠溶液:制备时秤取约12.4克分析纯的硫代硫酸钠于有色玻瓶中,用蒸馏水1升溶解之,添加0.5克化学纯或分析纯的碳酸钠,仔细地摇动,经过8—10日后按本标准方
The current method for determining tetraethyl lead and lead in gasoline is to first decompose tetraethyl lead in gasoline with hydrochloric acid and then measure the lead in the hydrochloric acid extract using the chromate capacity method. Ⅰ. Reagents The following special reagents are required for the test: (1) 0.05n sodium thiosulfate solution: about 12.4g of analytical grade sodium thiosulfate is prepared in a colored glass bottle , Dissolved in 1 liter of distilled water, add 0.5 g of chemically pure or analytically pure sodium carbonate, shake carefully, after 8-10 days according to this standard