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    分散液液微萃取分离-气相色谱法测定水中7种苯系物的含量

    GC Determination of 7 Benzene Homologues in Water with Separation by Dispersive Liquid-liquid Microextraction

    • 摘要: 提出了分散液液微萃取-气相色谱法测定水中苯系物的方法。取水样10.00 mL,以100 μL二硫化碳为萃取剂、0.50 mL甲醇为分散剂进行分散液液微萃取,萃取过程可在30s以内完成,富集倍数达100左右。离心后取下层二硫化碳溶液进行色谱测定,使用大口径毛细管柱不分流进样模式,氢火焰离子检测器(FID)检测。7种苯系物的质量浓度在0.002 0~1.00 mg·L-1范围内呈线性,方法的检出限(3S/N)为0.5~0.6 μg·L-1。在3种浓度水平下进行加标试验,测得的回收率为87.0%~101%,相对标准偏差(n=6)小于8.5%。

       

      Abstract: The method was proposed for determination of 7 benzene homologues in water by dispersive liquid-liquid microextraction-GC. The water sample (10.00 mL) was extracted for 30 s with 100 μL of CS2, and with 0.5 mL of CH3OH added as dispersant. Seven benzene homologues were transferred from water into CS2, and enriched to about 100 times in concentration. After centrifuging, the lower phase of CS2 was taken and analyzed by GC. Large diameter capillary column and sampling by the mode of non-streaming together with FID detector were adopted in GC analysis. Linear relationships between values of peak areas and mass concentrations of 7 the benzene homoloques were obtained in the same range of 0.002 0-1.00 mg·L-1, and values of detection limits (3S/N) found were in the range of 0.5-0.6 μg·L-1. Tests for recovery were made by standard addition method at 3 concentration levels, giving values of recovery in the range of 87.0%-101% and RSDs (n=6) less than 8.5%.

       

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