离子色谱法测定牙膏中的锶

Determination of strontium in toothpaste by ion chromatography

〔目的〕采用离子色谱法测定牙膏样品中的锶。〔方法〕选择 2 0mmol L甲磺酸作为淋洗液 ,流速 0 60ml min ,IonPacCS12阳离子分离柱分离和测定。本文还进行了钙离子及pH值的干扰试验。〔结果〕本法线性范围大于 0 .0 0 5～13 .0mg L ,相关系数大于 0 .9972 ,方法检出限为 0 .0 41mg L ,相对标准偏差小于 1.0 %,加标回收率为 82 %～ 10 9%。〔结论〕本法操作简单 ,灵敏度较高 ,线性范围宽 ,不失为一种较好的测定方法。

Objective To establish an ion chromatographic method for determination of strontium in toothpaste.〔Methods〕 Cations were separated by eluent of 20mmol/L membrane-sulfonic acid using auto-regeneration at a flow velocity of 0.6ml/min.Interferential factors such as calcium and acidity were also determined in this study.〔Results〕 This method showed broad linear range and good correlativity ( r >0.9970).The detection limit reached 0.041mg/kg.The precision and accuracy were good (RSD<1.0%).The average recovery rate was between 82% and 109%.〔Conclusions〕 This method is simple and highly sensitive and can be used for determination of strontium.