title: Evaluation of environmental polychlorobiphenyls and DDE in terms of mixtures of commercial preparations from peak heights of packed-column gas chromatograms using a programmable calculator.
abstract: A method is proposed for evaluating gas chromatograms of multi-component PCB mixtures and superposed single components simultaneously. Apparent concentrations relative to a calibration mixture are assigned to a number of suitable peaks, and the apparent concentrations are related to the true concentrations by a set of linear equations, which are solved by least-squares approximation. The results are provided with an estimate of their confidence intervals.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D003633:Dichlorodiphenyl Dichloroethylene / Q000032:analysis*; D004785:Environmental Pollutants / Q000032:analysis*; D008433:Mathematics; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D012997:Solvents
chemical_list: D004785:Environmental Pollutants; D012997:Solvents; D003633:Dichlorodiphenyl Dichloroethylene; D011078:Polychlorinated Biphenyls