改进的极谱法测定化探样品中的钨钼

Determination of Tungsten and Molybdenum in Geochemical Exploration Samples by Modified Polarography

1.
Laboratory of XinJiang Geological Exploration Center, China Building Materials Industry Corps
2.
Laboratory of XinJiang Geological Exploration Center, China Building Materials Industry Corps
3.
Laboratory of XinJiang Geological Exploration Center, China Building Materials Industry Corps

摘要: 试样经氢氧化钾熔融，水提取，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JP—06A精密极谱分析计测定钨、钼，使测定的灵敏度大为提高。钨、钼的峰电位分别为-0.76 V、-0.26 V（相对饱和甘汞电极），钨、钼含量在1.0～100.0 ng/mL时，峰高与浓度呈线性关系。方法经国家一级标准物质检验，测定结果与标准值吻合，方法精密度（RSD，n=12）钨、钼均小于5%。
- 极谱法； /
- 二苯乙醇酸； /
- 极谱催化波； /
- 钨； /
- 钼
Abstract: The sample is melted with potassium hydroxide and extracted with deionized water. In sulfuric aciddiphenyl glycollic aciddiphenyl guanidinepotassium chlorate system, tungsten (W) and molybdenum (Mo) produce polarographic catalytic waves with peak potentials (vsSCE) at -0.76 V and -0.26 V, respectively. The method provides the high sensitivity and wide dynamic linear range (1.0～100.0 ng/mL for W and Mo). The method has been applied to the determination of W and Mo in National Standard Reference Materials and the results are in agreement with certified values with precision of less than 5%RSD
- polarography /
- /
- diphenyl /
- glycollic /
- acid