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提出用PVC膜缬氨霉素的钾离子选择性电极测定人造宝石原料——硫酸铝铵中钾的简便方法。铵离子有严重干扰,试验表明.可于700℃灼烧10分钟使大部分硫酸铵分解驱除,残留铵离子以甲醛掩蔽:三乙醇胺能使97%以上铝生成不影响测定的氢氧化物沉淀,然后直接采用稀释-标准加入法分析试样中1ppm左右痕量钾。试剂与装置铝溶液——称取22.06克硫酸铝溶解于水,并移入200毫升容量瓶中,定容,摇匀。10毫升此液与1.5克硫酸铝铵中含铝量相当,要预先用原子吸收法求出其中含钾量;钾标准溶液——用氯化钾按常法配制成1毫升含0.1毫克钾储存溶液,用时
A simple and convenient method for determination of potassium in ammonium-ammonium-sulphate, the raw material of artificial gem, with potassium-ion selective electrode of valinomycin with PVC membrane was proposed. Ammonium ions have serious interference, the experiment shows that it can burn at 700 ℃ for 10 minutes to make most of the decomposition of ammonium sulfate to drive out, the residual ammonium ion masking with formaldehyde: triethanolamine can make more than 97% of the aluminum generated does not affect the determination of the precipitation of hydroxides, Then directly diluted - standard addition method analysis of trace elements in the trace amount of 1ppm potassium. Reagents and equipment Aluminum solution - Weigh 22.06 grams of aluminum sulfate dissolved in water and transferred to 200 ml volumetric flask, set the volume, shake. 10 ml of this solution is equivalent to 1.5 g of aluminum aluminum sulfate, and the amount of potassium contained therein should be determined beforehand by atomic absorption. Potassium standard solution - 1 ml of potassium standard solution containing potassium chloride Solution, when used