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本文采用空气—乙炔火焰原子吸收分光光度法,测定含铬硬质合金中0.x～0.0x％的铬,方法简便、快速、准确度和精密度均符合要求,方法的相对标准偏差为4％左右。 一、试剂与仪器 铬标准溶液(0.4mg/ml):称取0.2830g优级纯重铬酸钾,用水溶解,移入250ml容量瓶中,以水稀释至刻度;钨溶液(50mg/ml):称取15.763g纯度为99.9％以上的三氧化钨,用40％氢氧化钠溶液50ml,加热溶解,冷却后,移入250ml容量瓶中,以水稀释至刻度;钴溶液(10mg/ml):称取3.482g高纯氧化钴(含钴
In this paper, air-acetylene flame atomic absorption spectrophotometry was used to determine the content of chromium from 0.x to 0.0x% in chromium-containing hard alloys. The method is simple, rapid, accuracy and precision are in line with the requirements, the relative standard deviation of the method is 4 %about. A reagent and instrument chromium standard solution (0.4mg / ml): Weigh 0.2830g grade pure potassium dichromate, dissolved in water, transferred to a 250ml volumetric flask, diluted with water to the mark; Tungsten solution (50mg / ml) Weigh 15.763g of tungsten trioxide purity of 99.9% or more, with 40% sodium hydroxide solution 50ml, dissolved by heating, cooled, transferred to a 250ml volumetric flask, diluted with water to the mark; cobalt solution (10mg / ml) Take 3.482g high purity cobalt oxide (containing cobalt