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We determined stable carbon isotopic compositions (δ13C) of plastics to discriminate between plant- and petroleum-derived plastics. The δ13C values of plastics derived from C4 plants are significantly higher than those of petroleum-derived plastics. These results suggest that the stable isotope analysis would be useful in discrimination of plant-derived plastics from petroleum-derived plastics.
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Suzuki et al. (2010) studied this question.
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