Compound-Specific Chlorine Isotope Analysis of Organochlorine Pesticides by Gas Chromatography-Negative Chemical Ionization Mass Spectrometry

Figure 7

IR (³⁷Cl/³⁵Cl) values at different concentrations for eight organochlorine pesticides: α-hexachlorocyclohexane (α-HCH), β-hexachlorocyclohexane (β-HCH), γ-hexachlorocyclohexane (γ-HCH), δ-hexachlorocyclohexane (δ-HCH), 1-chloro-2-[2, 2, 2-trichloro-1-(4-chlorophenyl) ethyl] benzol (o, p′-DDT), 2, 2-bis (p-chlorophenyl)-1, 1, 1-trichloroethane (p, p′-DDT), 2, 2-dichloro-1, 1-bis (4-chlorophenyl) ethylene (p, p′-DDE), and 1, 1-dichloro-2, 2-bis (p-chlorophenyl) ethane (p, p′-DDD).