论文部分内容阅读
测定钢中的铅常用化学分析方法是采用双硫腙萃取分光光度法,需用极毒的物质一氰化钾,不但方法复杂、手续繁琐,而且操作技术要求高。改用原子吸收光谱测定铅后,不仅操作简单、时间短,而且干扰少,准确度高。一、方法要点试样以硝酸溶解,用水稀至一定体积,以空气—乙炔焰、标准曲线法进行测定。本法适用于碳素钢、高锰钢、中低合金钢中含0.05—0.5％铅的测定。二、仪器与试剂硝酸:分析纯,(1+3) 铅标准液:1毫升=1毫克铅。称1克金属铅于200毫升烧杯中,加入30毫升硝酸(1+3);加热溶解、冷却。将溶液移入1升容量瓶中,用水稀释至刻度,摇匀备用。
Determination of lead in steel Common chemical analysis method is the use of dithizone extraction spectrophotometry, the need to use a very toxic substance potassium cyanide, not only the complexity of the procedure, procedures cumbersome, and high operating technical requirements. Switch to atomic absorption spectrometry after the lead, not only simple, short time, and less interference, high accuracy. First, the method points Sample dissolved in nitric acid, diluted with water to a certain volume to air - acetylene flame, standard curve method for determination. This law applies to carbon steel, high manganese steel, low alloy steel containing 0.05-0.5% lead determination. Second, equipment and reagents Nitric acid: Analytical pure, (1 +3) lead standard solution: 1 ml = 1 mg lead. Weigh 1 gram of metallic lead in a 200 ml beaker and add 30 ml of nitric acid (1 + 3); dissolve by heating and cool. The solution into 1 liter volumetric flask, diluted with water to the mark, shake spare.