离子色谱法测定辣椒粉中的二氧化硫

The detection of sulfur dioxide in paprika by ion chromatography

目的建立一种快速准确的离子色谱法测定辣椒粉中二氧化硫残留量。方法样品在酸性条件下加热蒸馏,二氧化硫被H2O2吸收氧化为硫酸根,通过离子色谱法测定。结果二氧化硫含量在0~667.0 mg/kg范围内线性良好,回归方程y=1.01809x-0.07779,相关系数r=0.999 9;加标浓度为1.0、10、100 mg/kg时,回收率为82.79%~108.7%,相对标准偏差（RSD）均〈5%（n=6）;检出限为0.1 mg/kg。结论本方法前处理简单,干扰少,准确度、灵敏度高,适合辣椒粉中二氧化硫残留检测。

Objective To establish a method for the determination of sulfur dioxide in paprika by ion chromatography. Methods After the sample being crushed in acidic condition, sulfur dioxide in the sample was distilled and oxidized to sulfate by H2O2, and determined by ion chromatography. Results The calibration curve was linear in the concentration range of 0-667.0 mg/kg （r = 0. 999 9） , the recovery was in the range of 82.79% -108.7% , the relative standard deviation （RSD） was less than 5% , and the limit of detection of sulfur dioxide was 0, 1 mg/kg. Conclusion This simple method has less interference, good specificity, accuracy and sensitivity.