A simple hydrofluoric acid-free pressurized-cavity microwave-assisted acid digestion method for determination of impurity elements in recycled carbon fibers with ICP-MS

A simple method was proposed for the determination of 13 impurity elements (Na, Mg, Al, K, Ca, Ti, Cr, Fe, Co, Ni, Cu, Zn, and Pb) in recycled carbon fibers (rCFs) using pressurized-cavity microwave-assisted acid digestion without hydrofluoric acid (HF) combined with inductively coupled plasma mass spectrometry. Elevating the digestion temperature to 280 °C under pressurized conditions facilitated the dissolution of the target elements in rCF, even when present in refractory forms. Because certi