Ultratrace determination of total and available cyanides in industrial wastewaters through a rapid headspace-based sample preparation and gas chromatography with nitrogen phosphorous detection analysis

•Selective ultratrace determination of cyanides by headspace GC-NPD.•Easy sample preparation for the analysis of both available and total cyanides in wastewaters.•Speciation of cyanides through different thermal treatment.•Proposal of an equilibrium model for weak acid dissociable cyanide complexes....

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