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溴化钾是制造彩色胶卷感光材料的主要原料之一,内含痕量铅,为了提高彩卷质量,生产中必须严格控制溴化钾中铅含量,故需进行准确测定。目前铅的测定方法有比色法,萃取光度法,电位溶出法,化学修饰电极阳极溶出伏安法,离子选择电极测定法和原子吸收。以上方法需经烦琐的分离及预富集过程,应用中常受样品基体的干扰,不适用于高纯试剂中痕量元素的分析。1974年Lund等人提出用电沉积与石墨杯原子吸收相结合的测定方法,Czobik等人于1980年首先成功地用高熔点钨丝为富集痕量元素的工作电极,李银玉等人研究了增大钨丝直径与提高灵敏度和抗干扰能力等有关问题,马光正等人采用钨丝电化分离富集电热原子
Potassium bromide is one of the main raw materials for manufacturing color film photographic materials. It contains traces of lead. In order to improve the quality of the color film, the lead content in potassium bromide must be strictly controlled during the production. Therefore, it needs to be accurately measured. At present the determination of lead in colorimetry, extraction spectrophotometry, potentiometric stripping method, chemically modified electrode anodic stripping voltammetry, ion-selective electrode determination and atomic absorption. The above method requires cumbersome separation and pre-enrichment process, the application often interference by the sample matrix is not suitable for the analysis of trace elements in high purity reagents. In 1974, Lund et al. Proposed a method for the combination of electrodeposition and graphite cup atomic absorption. Czobik et al. Successfully used the high melting point tungsten filament as the working electrode for enriching trace elements in 1980. Li et al. Large tungsten wire diameter and improve the sensitivity and anti-interference ability and other related issues, Ma Guangzheng et al tungsten electrode separation and enrichment of electrothermal atoms