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灼烧含钾及钠的样品除去NH_4~+,并使KHSO_4及NaHSO_4分解。使所得残渣溶于少量水中,加水稀释至10到20毫升。为了测定钾钠的总含量,可使一部份溶液流经阳离子交换剂KS,再用水洗涤4—5次。将流出的溶液(50或100毫升)加热至沸,然后用0.01N NaOH滴定,应用甲基红加甲基蓝配成的混合指示剂。在另一份溶液中加入1%的CH_3COOH溶液,至溶液的pH值等于4,再加入2—3毫升NH_4Cl溶液,加热至70℃,用过量1倍或2倍的3%的Na[(C_6H_5)_4B]溶液沉淀K~+及NH_4~+,冷却后滤出沉淀,用水洗涤沉淀2次,每次用水0.5毫升,然后用K[(C_6
Burning samples containing potassium and sodium to remove NH 4 + and decompose KHSO 4 and NaHSO 4. The resulting residue was dissolved in a small amount of water and diluted with water to 10 to 20 ml. To determine the total potassium content, a portion of the solution may be passed through a cation exchanger KS and then 4-5 times with water. The eluted solution (50 or 100 ml) was warmed to boiling and then titrated with 0.01 N NaOH using a mixture of methyl red and methyl blue as a mixed indicator. Add 1% CH_3COOH solution to another solution until pH value of the solution is equal to 4, then add 2-3 ml of NH_4Cl solution, heat to 70 ° C, dilute with 1% or 2% excess of 3% Na [(C_6H_5 ) _4B] solution precipitation K ~ + and NH_4 ~ +, after cooling the precipitate was filtered off, the precipitate was washed with water twice, each time with water 0.5 ml, and then with K [(C_6