比色法快速测定党参中二氧化硫的残留量

[目的]测定党参中二氧化硫的残留量。[方法]采用比色法快速测定党参中二氧化硫的残留量。[结果]在0.0～48.0μg/ml范围内,二氧化硫浓度与吸光度的线性关系良好,相关系数R为0.999 2,相对标准偏差在0.54%～1.66%;加标回收率为90.1%～103.7%,RSD为1.16%～5.17%(n=6),且具有良好的重现性和稳定性。应用测试结果表明,比色法的测定结果与酸蒸馏法相似。[结论]该方法简便、快速、灵敏度高、干扰少,可用于党参中二氧化硫的残留量测定。

Rapid Determination of Sulfur Dioxide Content in RADIX CODONOPSIS by Colorimetric Method

[Objective] To determine the residue of sulfur dioxide in RADIX CODONOPSIS.[Method] The residue of sulfur dioxide in RADIX CODONOPSIS was rapidly determined by colorimetric method.[Result] The concentration of sulfur dioxide showed a good linear relation with the absorbance within the range of 0.0-48.0 μg/ml,the correlation coefficient R was 0.999 2,the relative standard deviation was 0.54%-1.66%,and the recoveries was 90.1%-103.7%,the RSD was 1.16%-5.17%(n=6) with good reproducibility and stability.The application test results showed that the colorimetric method had good uniformity when compared with classic acid distillation.[Conclusion] The method is simple and rapid with high sensitivity and less disturbance,thus can be used for the determination of sulfur dioxide in RADIX CODONOPSIS.