The salting‐out assisted liquid–liquid extraction (SALLE) combined with dispersive liquid–liquid microextraction based on the solidification of floating organic droplet (DLLME‐SFO) has been first developed as a high preconcentration technique for the extraction of pyrethroid insecticides (PYRs) in multimedia environmental samples, including air, soil, water, human urine, hedgehog serum and plasma. GC‐MS was the separation and determination technique. Under the optimum extraction conditions (sample pH 2; salting‐out solution volume and pH, 2 mL and 3; extraction solution, 300 µL of 1‐undecanol; centrifugation speed and time, 2000 rpm and 15 min) and determination conditions, a linearity range (R² = 0.9993–0.9999) was obtained in a range of 5–5000 ng/mL. The limits of detection based on a signal‐to‐noise ratio of 3 were between 1.5 and 6.1 ng/mL. The recoveries of the four PYRs ranged from 66 to 122%. The results demonstrated that this SALLE–DLLME‐SFO–GC‐MS method allowed the satisfactory enrichment, purification and determination results of PYRs in multimedia environmental samples.

中文翻译：

---

两种微萃取方法结合气相色谱法测定多媒体环境样品中的拟除虫菊酯类杀虫剂：空气，水，土壤，尿液和血液

盐析辅助液-液萃取（SALLE）结合基于漂浮有机液滴固化的分散液-液微萃取（DLLME-SFO）首次被开发为提取拟除虫菊酯类杀虫剂（PYR）的高浓缩技术在多媒体环境样本中，包括空气，土壤，水，人尿，刺猬血清和血浆。GC-MS是分离和测定技术。在最佳萃取条件下（样品pH 2；盐析溶液的体积和pH，2 mL和3；萃取溶液，300 µL的1-十一醇；离心速度和时间，2000 rpm和15 min）和测定条件，线性范围（R ² = 0.9993–0.9999）的范围是5–5000 ng / mL。基于3的信噪比的检测极限在1.5到6.1 ng / mL之间。四个PYR的回收率在66％至122％之间。结果表明，这种SALLE-DLLME-SFO-GC-MS方法可以对多媒体环境样品中的PYR进行令人满意的富集，纯化和测定结果。