标准曲线法测定汞的局限性

Limitation of using standard curve method to calculate hg

常用的汞分析方法 ,如冷原子吸收分光光度法、原子荧光法、双硫腙分光光度法等均为吸光光度分析法 ,在已颁布的汞标准分析方法中都采用标准曲线法。然而 ,通过对汞质控标样的分析及将多年环境监测的结果经数理统计 ,发现用标准曲线的回归系数来计算样品中汞的测定结果 ,使低含量样品中汞浓度偏高 ,高含量样品中汞浓度偏低 ,若用相应吸收值的标准溶液浓度来计算样品中汞浓度 ,测定结果更准确。

On the basis of analysis of quality control samples of Hg, and using mathematical statistics on the inviromental monitoring results of many years, we found that the concentration of Hg world be higher, but in the high concentration samples, the result whord be lower using regression coefficient of standard curve to calculate samples. On the other hand, when we use corresponding absorption value of standard solution to calculate concentration of Hg, the results are much accuracy.