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固相微萃取中的溶胶―凝胶聚二甲基硅氧烷萃取头的制备与使用

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Keywords: 固相微萃取,气相色谱,溶胶-凝胶

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Abstract:

固相微萃取(SPME)装置中采用溶胶-凝胶法制备了以端羟基聚二甲基硅氧烷(PDMS)为固定相的石英探针萃取头,此萃取头可在高达300℃以上的高温下使用,且对多种化合物都有良好的萃取效果.该装置与气相色谱联用,6次测定同一色谱峰面积的相对标准偏差不超过2.66%,而同样条件下保留时间测定的标准偏差不超过0.3%.实验证明该溶胶-凝胶萃取头的萃取量与商用萃取头相当,可在10~15min内达到萃取平衡,解吸速度快,有较低的检出限,使用寿命长.

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