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金属镉中微量铅的测定,过去沿用分光光度法,流程长,且要用氰化钾。而原子吸收法测定铅,选择性好,干扰少,但灵敏度又较低。本文提出微量铅与氢氧化铁共沉淀富集,分离基体镉。提高了方法灵敏度。含铅量0.001％,标准偏差为0.00007％仪器:WFX—1A型原子吸收分光光度计。测定条件:分析线283.3nm;灯电流5mA,狭缝宽度0.2mm,空气流量4.51/min,乙炔流量1.21/min,燃烧器高度6mm仪器刻度。样品分析:称取试样5.0g,分次加入40ml硝
Determination of trace amounts of cadmium in the metal, the spectrophotometry used in the past, the process is long, and the use of potassium cyanide. The atomic absorption method for the determination of lead, good selectivity, less interference, but lower sensitivity. In this paper, trace lead and iron hydroxide co-precipitation enrichment, the separation of matrix cadmium. Improved method sensitivity. 0.001% lead content, standard deviation of 0.00007% Instrument: WFX-1A atomic absorption spectrophotometer. Measurement conditions: Analysis line 283.3nm; Lamp current 5mA, slit width 0.2mm, air flow 4.51 / min, acetylene flow rate 1.21 / min, burner height 6mm instrument scale. Sample Analysis: Weigh the sample 5.0g, 40ml of nitrate by adding in portions