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Standards Development
This document specifies a method for the determination of impurity elements in recycled carbon fibre (rCF) using inductively coupled plasma mass spectrometry (ICP-MS). Two pretreatment techniques are covered: microwave-assisted acid digestion and laser ablation. The method employing microwaveassisted acid digestion is applicable to the determination of thirteen non-volatile elements (Na, Mg, Al, K, Ca, Ti, Cr, Fe, Co, Ni, Cu, Zn and Pb), while the method employing laser ablation is applicable to two volatile elements (Br and Hg). This document describes the analytical procedure, including reagents, apparatus and sample preparation. It is intended to support the evaluation of the potential harmfulness and quality of rCF with respect to impurity elements.
Most waste and scrap generated during the manufacturing of carbon fibre reinforced composites (CFRCs) are currently disposed of in landfills, thereby contributing to environmental impacts such as increased CO emissions throughout the carbon fibre (CF) lifecycle. To mitigate these impacts, it is essential to recover CF from waste composites and reuse it as recycled carbon fibre (rCF). For rCF to be viable, its safety and quality must be assured. Therefore, a standardized method of analysing impurity elements in rCF is required to evaluate these properties. These impurity elements may originate from the CF itself, residual plastics, composite multi-structures, chemicals used during processing, and contamination introduced during recycling. The proposed method enables the analysis of 15 impurity elements (Na, Mg, Al, K, Ca, Ti, Cr, Fe, Co, Ni, Cu, Zn, Pb, Hg, and Br) using inductively coupled plasma mass spectrometry (ICP-MS) combined with pretreatments of microwave-assisted acid digestion for 13 non-volatile elements and laser ablation for two volatile elements. This approach is simple, efficient, allowing ICP-MS measurement with a single-step pretreatment. Analytical performance tests on rCF samples have demonstrated satisfactory results for impurity evaluation. Standardizing this method will ensure consistent safety and quality control for rCF, supporting its broader adoption. This will reduce environmental impacts associated with CF disposal while lowering costs.
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