Phase transfer hollow fiber liquid phase microextraction combined with electrothermal vaporization inductively coupled plasma mass spectrometry for the determination of trace heavy metals in environmental and biological samples

► PT-HF-LPME was proposed for extraction of trace metal ions. ► Enhanced extraction efficiency within short extraction time was obtained. ► 8-HQ served as both chelating agent in PT-HF-LPME and chemical modifier in ETV. ► PT-HF-LPME-ETV-ICP-MS was developed for real-world samples analysis.