Purity estimation of seized stimulant-type new psychoactive substances without reference standards by nitrogen chemiluminescence detection combined with GC-APCI-QTOFMS

•Reference standards for new psychoactive substances (NPS) are not readily available.•Nitrogen chemiluminescence detection (NCD) possesses equimolar response to nitrogen.•GC-NCD allowed purity estimation of stimulant NPS with only two external calibrators.•The grand mean equimolarity of twenty-eight...

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