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序言由于大部分低级卤代烃在常温下都呈气体状态,其响应值也不规则,所以不仅用制备色谱难以提供标样,而且定量工作也很困难。Messer 等人曾提出,相对克分子的响应值(RMR)在同系列的化合物中是分子量的线性函数,可适用于很宽的试验范围。其后 Littlewood 又提出,在用氦作载气时,可根据卤代烃的分子直径预测其RMR 值,计算式RMR=(σ_i—σ_1)~2/(σ_φ—σ_1)~2[(M_i—M_1)/(M_φ—M_1)]~(1/4)×100式中:σ-分子直径;M-分子量。脚注:τ-流出溶质;1-载气氦;φ-苯;因数100-苯的响应值(指定每克分子苯为100个响应单
Introduction Since most of the lower halogenated hydrocarbons are gaseous at room temperature and their response values are irregular, it is difficult to provide a standard sample not only by preparative chromatography but also by quantitative work. Messer et al. Have suggested that the relative molecular response (RMR) is a linear function of molecular weight in the same series of compounds and is suitable for a wide range of assays. Later, Littlewood proposed that the RMR value can be predicted from the molecular diameter of halogenated hydrocarbons when carrier gas is helium, and the formula RMR = (σ_i-σ_1) ~ 2 / (σ_φ-σ_1) ~ 2 [(M_i- M_1 / M_φ-M_1] ~ (1/4) × 100 where σ-molecular diameter and M-molecular weight. Footnotes: τ-out of the solute; 1-carrier helium; φ-benzene; factor 100-benzene response value (specified as benzene per 100 molecules of response to a single