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准确,自动地吸取溶液不但可以提高测定的准确性,而且还能加快分析速度,改善操作条件。这里介绍的自动定量移液管经长期生产实践表明:具有精度高、制作容易和便于推广等优点。自动定量移液管的结构见图1。胖肚移液管于刻度处截断使用(截断的移液管的刻度上部液面呈凸面,其容积近似等于不截断时刻度上部液面呈凹面的容积).刻度值分别为1、2、5、10、25毫升胖肚移液管经截断用以吸取蒸馏水重复操作四次,测得真实值为0.993、2.007、4.97、9.98、25.00
Accurate and automatic pipetting solution not only can improve the accuracy of the determination, but also speed up the analysis speed and improve the operating conditions. The automatic quantitative pipette introduced here shows that after long-term production practice, it has the advantages of high precision, easy manufacture and convenient promotion. Automatic quantitative pipette structure shown in Figure 1. The fat pipette is truncated at the mark (the upper liquid of the truncated pipette is convex, the volume of which is approximately equal to the volume of the upper liquid that is not concave when not cut off.) The scale values are 1, 2, 5 , 10,25 ml fat belly pipette truncated to draw distilled water repeated operation four times, measured the true value of 0.993,2.007,4.97,9.98,25.00