茲对鹼金屬的微量测定提出一种分離有害陽離子的方法,在此法中同時使用8-羟基喹啉(8-oxyquinoline)(Ⅰ)和草酸銨(Ⅱ)。將10—20毫克物質首先用4毫升40%HF溶液和20毫升濃硫酸处理,蒸發至乾,然後再用1毫升HF处理並蒸發至乾。殘渣溶入10毫升水內,添加0.5毫升40%溶液Ⅱ和3—4毫升溶液Ⅰ(4克Ⅰ溶於8毫升冰醋酸和88毫升水內)在加熱到60°之後,將50%的醋酸銨(Ⅲ)溶液滴到出現不變的渾濁为 Here, a method of separating harmful cations is proposed for the trace determination of alkali metals, in which 8-oxyquinoline (I) and ammonium oxalate (II) are simultaneously used. 10-20 mg of material are first treated with 4 ml of 40% HF solution and 20 ml of concentrated sulfuric acid, evaporated to dryness and then treated with 1 ml of HF and evaporated to dryness. The residue was dissolved in 10 ml of water and 0.5 ml of 40% solution II and 3-4 ml of solution I (4 g I dissolved in 8 ml glacial acetic acid and 88 ml water) were added. After heating to 60 °, 50% acetic acid Ammonia (Ⅲ) solution drip to constant turbidity