Busch K L, Norström A, Bursey M M, Hass J R, Nilsson C A
Biomed Mass Spectrom. 1979 Apr;6(4):157-61. doi: 10.1002/bms.1200060405.
Methane-oxygen enhanced negative ion mass spectra of 15 chlorinated diphenyl ethers contained some combination of [M-]-., [M-1]-, [M-19]-, [M-36]-, [M-55]-, and [M+35]- anions. The relative abundances of these ions are related to the chlorine substitution pattern. Similar ions appear in the negative ion spectra of polychlorinated anisoles. The study of known isomers of polychlorinated model compounds extends the utility of the negative ion method in the analysis of polychlorinated aromatics such as polychlorinated biphenyls, dioxins and furans. The spectra were shown to be very dependent on the temperature of the ion source; a temperature change of 25 degrees C was shown to have pronounced effects. Spectral variation with temperature has implications for computer library searches, ultimate sensitivity limits and analysis in the presence of interfering isobaric ions.
15种氯代二苯醚的甲烷 - 氧气增强负离子质谱包含[M - ]⁻、[M - 1]⁻、[M - 19]⁻、[M - 36]⁻、[M - 55]⁻和[M + 35]⁻等阴离子的某种组合。这些离子的相对丰度与氯取代模式有关。类似的离子出现在多氯代苯甲醚的负离子光谱中。对多氯代模型化合物已知异构体的研究扩展了负离子法在分析多氯代芳烃（如多氯联苯、二恶英和呋喃）中的应用。结果表明，光谱非常依赖于离子源的温度；25℃的温度变化显示出显著影响。光谱随温度的变化对计算机库检索、最终灵敏度极限以及在存在干扰等压离子的情况下进行分析都有影响。
