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银镉合金因镉有毒性而被逐渐淘汰,取而代之的银锡合金的应用日益广泛。本文提出测定含锡银焊料中银、铜、镍、锌、锰和锡六种元素的新方法,前五种元素可利用同一份试样顺序测得。分析步骤1.银的测定准确称取0.5克试样于250毫升塑料杯中,加4滴氢氟酸(≥40%)、6毫升超纯硝酸(1+1)。溶解后加入少许尿素以除去氮氧化物。再加0.5毫升乳酸,用去离子水稀释至80—90毫升。用已称重的铂网电极作阴极,217型饱和甘汞电极作参比电极,DJS-52型控制电位电解仪进行电解。先开动搅拌
Silver-cadmium alloys have been phased out due to cadmium toxicity and replaced by silver-tin alloys increasingly widely used. This paper presents a new method for the determination of silver, copper, nickel, zinc, manganese and tin in tin-containing solder. The first five elements can be measured in the same sample sequence. Analysis Procedure 1. Determination of Silver Weigh accurately 0.5 g of the sample in a 250 ml plastic cup and add 4 drops of hydrofluoric acid (≥ 40%) and 6 ml of ultrapure nitric acid (1 + 1). Add a little urea to dissolve the nitrogen oxides. Add 0.5 ml of lactic acid and dilute to 80-90 ml with deionized water. With already weighed platinum mesh electrode as the cathode, 217-type saturated calomel electrode as the reference electrode, DJS-52 type control potential electrolysis instrument for electrolysis. First start mixing