在高中生物“叶绿素中色素的提取和分离”实验中,所划滤液细线的效果和质量直接关系到色素在滤纸条上的分布是否均匀,四种色素扩散起点是否一致,这些因素直接影响实验效果。划滤液细线的要求是线条要细而齐。课本上的划法是用毛细吸管吸取少量滤液,沿铅笔线处小心均匀地划线。 In high school biology “extraction and separation of pigments from chlorophyll” experiments, the effect and quality of the thin lines of the filtrate are directly related to whether the distribution of pigments on the filter paper is even, and whether the four pigment diffusion starting points are the same or not. Directly affect the experimental results. The requirement of the thin line of the filtrate is that the lines should be fine and homogeneous. The text on the textbook is to draw a small amount of filtrate through a capillary pipette and scribing it evenly and evenly along the pencil line.