Polymer-mediated extraction of the fluorescent compounds derived by Hantzsch reaction with dimedone for the sensitive determination of aliphatic aldehydes in air.
Polymer-mediated extraction of the fluorescent compounds derived by Hantzsch reaction with dimedone for the sensitive determination of aliphatic aldehydes in air.
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DOI：
10.1016/j.chroma.2006.09.002
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
T. Saitoh;Syuntaro Suzuki;M. Hiraide
中科院分区：
文献类型：
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作者：
T. Saitoh;Syuntaro Suzuki;M. Hiraide
基于水溶性聚合物聚N-异丙基丙烯酰胺[PNIPAAm]的温度响应性沉淀，建立了一种用于高灵敏测定空气中醛的萃取法。空气中的脂肪醛包括甲醛、乙醛、丙醛、1-丁醛、1-庚醛和1-己醛，通过将溶液和空气样品混合在聚氟乙烯袋中，可以很好地增溶到敌草酮和乙酸铵的水溶液中。Hantzsch与联苯双酮反应生成的醛的荧光衍生物通过聚合物介体萃取进行浓缩。荧光化合物的回收率随醛的碳数增加而增加，在最佳条件下，含三个碳原子以上的醛衍生物的回收率可达80%以上。采用高效液相色谱分离-荧光检测法成功地测定了环境空气中丙醛、1-丁醛、1-庚醛和1-己醛等脂肪族醛的每立方米微克含量。所需的采样量和时间分别为11s和20s。
An extraction method based on the thermo-responsive precipitation of a water-soluble polymer, poly(N-isopropylacrylamide) [PNIPAAm], was applied to the concentration of dimedone (5,5-dimethylcycrohexane-1,3-dion) derivatives for the highly sensitive determination of aldehydes in air. Aliphatic aldehydes including formaldehyde, acetaldehyde, propanal, 1-butanal, 1-heptanal, and 1-hexanal in air were well solubilized into the aqueous solution of dimedone and ammonium acetate by mixing the solution and air sample in a polyvinyl fluoride bag. Fluorescent derivatives of aldehydes that had formed by the Hantzsch reaction with dimedone were concentrated by polymer-mediated extraction. The recoveries of the fluorescent compounds increased with increasing the carbon number of aldehyde and were more than 80% for the derivatives from aldehydes having more than three carbon atoms under the optimal conditions. Microgram per m3(sub-ppb) levels of the aliphatic aldehydes, propanal, 1-butanal, 1-heptanal, and 1-hexanal, in ambient air were successfully determined by HPLC separation with fluorometric detection. The sampling volume and time required were only 1l and 20s, respectively.