Handheld Microplasma Optical Emission Spectrometer Coupling With Self-Heating Solid-Phase Microextraction For On-Site Detection Of Urinary Lead

Microplasma-based optical emission spectroscopy (MP-OES) has great potential for application in analytical chemistry.However, further integration of efficient sample introduction methods is essential to enhance its capability for elemental field detection.Herein, a handheld nozzle-electrode point discharge optical emission spectrometry (μPD-OES) device coupled with a self-heating solid-phase microextraction (SH-SPME) device was constructed, which integrated sample introduction, detection, and data processing systems with low power consumption (~ 25 W) and battery-powered operation.The innovative SH-SPME completed thermal analyte desorption by directly heating the SPME fiber through a mini voltage regulator circuit board, significantly reducing power consumption and eliminating the external heating and high-temperature thermal desorption chamber required for conventional SPME-μPD-OES.The customized SH-SPME-μPD-OES device was successfully applied to analyze lead in urinary and other biological samples, with a limit of detection of 1.2 μg L -1 and recoveries ranging from 92% to 108%.It is worth noting that SH-SPME allows the building of a palm-sized atomic spectrometer (20.3 cm length × 10.3 cm width × 10.5 cm height).This device represents an important breakthrough in miniaturized atomic spectrometers and holds promise as a valuable tool for onsite elemental monitoring in various fields.