离子色谱法测定浙贝母中二氧化硫残留量

Determination of Residual Sulfur Dioxide in Fritillaria thunbergii Miq. by Ion-chromatography Method

摘要: 目的建立测定浙贝母中二氧化硫残留量的离子色谱法。方法样品经定氮仪蒸馏、3%过氧化氢溶液吸收后，进Dionex ICS-3000型离子色谱仪分析检测。结果硫酸根在0.000 05~2 mg内线性关系良好(r=1.000)；二氧化硫平均回收率为97.8%，RSD为2.1%(n=9)。结论该方法快速、简便、灵敏，精密度、重复性良好，适用于浙贝母中二氧化硫残留量的检测。

Abstract: OBJECTIVE To establish an ion-chromatography method for determination of residual sulfur dioxide in Fritillaria thunbergii Miq. METHODS The samples were analyzed by Dionex ICS-3000 ion-chromatography after distilled by steam, absorbed by 3% hydrogen peroxide. RESULTS The linear range of sulfate radical was 0.000 05-2 mg(r=1.000). The average recovery was 97.8% with the RSD of 2.1%(n=9). CONCLUSION The method is rapid, simple, sensitive, which shows good precision and reproducibility. It is suitable for determination of residual sulfur dioxide in Fritillaria thunbergii Miq.