在日常色谱分析中,有时会出现色谱峰形异变或鬼峰,这不但严重影响定量精度,甚至使分析工作无法进行。色谱峰形异常主要有拖尾、负峰、尖峰、前延峰等。前延峰在色谱中是比较少见的变形峰,在各种书籍和资料中介绍的也不多。在气相色谱法测定工作场所空气中二甲基甲酰胺时,FFAP毛细管色谱图中出现了前延峰。根据色谱常识,我们通过大量的试验和反复的验证,最终解决了色谱图出现的前延 In routine chromatographic analysis, chromatographic peaks or ghost peaks sometimes appear, which can seriously affect the quantitation accuracy and make the analysis impossible. Chromatogram peak abnormalities are trailing, negative peaks, spikes, peaks before the extension. Pre-Yanfeng peak in the chromatogram is relatively rare deformation peak, in a variety of books and information is not much. When gas chromatography was used to determine dimethyl formamide in the air of the workplace, a pre-peak was observed in the FFAP capillary chromatogram. According to chromatographic common sense, we pass a large number of tests and repeated verification, and ultimately solve the chromatogram appears before the extension