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International Journal of Interdisciplinary Research

Table 2 Various metal ions in recycled PET and their origins (Richard et al. 1992)

From: Poly (ethylene terephthalate) recycling for high value added textiles

Metal ions Concentration(ppm) Origin
Sb 220-240 Polycondensation catalyst
Co 50-100 Polycondensation catalyst
Mn 20-60 Transesterification catalyst
Ti 0-80 Polycondensation catalyst
Fe 0-6 Incorporated during washing
Na, Mg, Si - Food additives