催化比色法扩展痕量金测定范围的探索

对硫酸铈铵-硝酸亚汞体系催化比色法测定痕量金的试验方法进行重新研究，通过固定时间和吸光度法，在所确定实验条件下得到了催化反应常数K值，尝试在不重新显色的情况下利用K值计算得到的金含量是原方法的4倍，有效扩展了金的测定范围。使用该方法测定金国家一级标准物质，结果与推荐值吻合，采用等离子体质谱法与本方法做对照进行样品分析，测定结果符合行业规范要求。

Initial Study on Expanding Determine Range of Trace Gold by Catalytic Colorimetric Method

Ammonium ceric sulfate-mercurous nitrate system catalysis colorimetric method for determination of trace gold was restudied by fixed time and absorption spectrophotometry,and under the experimental conditions the catalytic reaction constant K value was determined.Meanwhile,we also tried without color again using the K value,which was calculated under the condition of the amount of gold that was four times of the original method, indicating effectively expands the range of measurement of gold.The method was employed to determine the national level standard material of gold,and the result was in accordance well with the recommended value. Additionally,using plasma mass spectrometry and the provisions as control sample analysis,the determination results conformed to the requirements of the industry standard.