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气相色谱(GC)图中的峰面积给出较好的定量信息,但保留时间给出的定性信息远不能令人满意。以相对保留值为基础的定性所伴随的不确定性,主要是由色谱柱的有限分离效率所造成,但柱温、载气流速的波动也起重要的作用。近年特殊检测器(包括联用技术)与高效毛细管柱的出现使保留值的测定更显重要。随着高精度仪器的出现,柱温可以控制在很高的精度,但柱内载气流速受分流处针形阀内样品凝聚、进样胶垫泄漏及样品骤然汽化的影响,造成不稳定的波动,从而成为毛细管柱系统中保留值飘移的重要原因。
The peak areas in gas chromatograms (GC) give better quantitative information, but the qualitative information given by retention times is far from satisfactory. The uncertainty associated with qualitatively based on relative retention is mainly due to the limited separation efficiency of the column, but column temperature and the fluctuation of the carrier gas velocity also play an important role. In recent years, special detectors (including the combination of technology) and the appearance of high-performance capillary column retention value determination is even more important. With the advent of high-precision instruments, the column temperature can be controlled at very high accuracy, but the carrier gas flow in the column is affected by the condensation of the sample in the needle valve at the shunt, the leakage of the sample pad and the sudden vaporization of the sample, resulting in unstable Fluctuation, which became a capillary column system retention value drift important reason.