Thiol-Functionalized Magnetic Biochar as an Efficient Sorbent for Magnetic Dispersive Micro-SPE Coupled with ICP-MS Determination of Pb(II), Cd(II), and Hg(II) in Environmental Waters

Key Points

• To evaluate the efficiency of thiol-functionalized magnetic biochar for extracting heavy metals from environmental water samples.
• Synthesis of thiol-functionalized magnetic biochar (MB-SH)
• Application of magnetic dispersive micro-solid-phase extraction (MD-µSPE)
• Coupling the extraction with inductively coupled plasma mass spectrometry (ICP-MS) for analysis
• Testing with Pb(II), Cd(II), and Hg(II) in water samples
• MB-SH showed a high adsorption capacity for Pb(II), Cd(II), and Hg(II)
• Simultaneous determination of metals achieved with high recovery rates
• ICP-MS confirmed the detection of heavy metals at low concentration levels
• The method improved sensitivity and specificity for environmental monitoring