摘要
化探样品经氢氧化钾熔融,用水提取其中的钨、钼,采用二苯乙醇酸代替苯羟乙酸,在硫酸-二苯乙醇酸-二苯胍-氯酸钾体系中,利用极谱催化波测定钨、钼,方法的灵敏度大大提高,钨、钼的峰电位分别为-0.76、-0.26V(对饱和甘汞电极),钨、钼含量为1.0～100.0ng/mL时,极谱峰高与浓度呈线性关系。方法经国家一级标准样品检验,测定结果与推荐值吻合,钨、钼测定结果的RSD分别为3.5%～4.1%、3.4%～3.9%(n=11)。
The sample was melted down in potassium hydroxide,then extracted with water. Diphenyl hydroxyacetic acid was used instead of hydroxyphenylacetic acid. Tungsten(W) and molybdenum(Mo) was determined by polarography in the system of sulfuric acid-diphenyl glycollic acid-diphenyl guanidine-potassium chlorate,and the sensitivity was greatly increased. The peak potential was-0.76 V for W and-0.26 V for Mo (with a saturated calomel electrode). The peak hight was linear with concentration at the concentration of 1....
出处
《化学分析计量》
CAS
2009年第2期37-39,共3页
Chemical Analysis And Meterage
关键词
二苯乙醇酸
极谱催化波
钨
钼
diphenyl hydroxyacetic acid
polarographic catalytic wave
tungsten
molybdenum
