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用硫化银膜离子选择电极测定某些金属。金属化合物及合金材料中的微量S~(2-)已有报道,大都采用酸溶试样,使S~(2-)以H_2S形式蒸馏分离,碱液吸收后再行测定。牙膏磨擦剂(高纯Al(OH)_3)中的痕量S~(2-)采用酸溶试样,分离吸收,次甲基蓝光度法测定,但灵敏度较低。本文对碱溶牙膏磨擦剂的条件作了探讨,并用等电位变化连续标准加入法测定了其中的痕量S~(2-),检测下限可达1.3μg/l,本法的精密度为2.03％(相对标准偏差),回收率为92.9～106.4％。 (一)仪器与试剂 PXJ-1型数字式离子计,314型硫电极,217型双盐桥参比电极(江苏电分析仪器厂)。
Silver sulfide membrane ion selective electrode for the determination of certain metals. It has been reported that trace amount of S ~ (2-) in metal compounds and alloy materials has been reported. Most of them are acid-soluble samples, which make S ~ (2-) distill with H 2 S by distillation. Trace S 2- (2) in toothpaste friction agent (high purity Al (OH) 3) was determined by acid solution, separation and absorption, and methylene blue photometric method with low sensitivity. In this paper, the conditions of alkali-soluble toothpaste friction agent were discussed, and the trace amount of S ~ (2-) was determined by the continuous addition of equipotential bonding method. The detection limit was up to 1.3μg / l. The precision of this method was 2.03 % (Relative standard deviation), the recovery rate of 92.9 ~ 106.4%. (A) Instruments and reagents PXJ-1 digital ion meter, 314 sulfur electrode, 217 Shuangyanqiao reference electrode (Jiangsu Electric Instrument Factory).