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移液管和吸量管相关知识及操作

字体: 小 中 大 | 打印 发表于: 2008-4-25 11:49    作者: shaochuan84    来源: 红樱桃化学化工网

移液管和吸量管相关知识及操作
移液管和吸量管的洗涤方法( ^" q! ?* X0 _# g3 S! H4 d
移液管和吸量管均可用自来水洗涤,再用蒸馏水洗净,较脏时(内壁挂水珠时)可用铬酸洗液洗净.
用洗液洗移液管或吸量管的方法是什么?
右手拿移液管或吸量管,管的下口插入洗液中,左手拿洗耳球,先将球内空气压出,然后把球的尖端接在移液管或吸量管的崐上口,慢慢松开左手手指,将洗液慢慢吸入管内直至上升到刻度以崐上部分,等待片刻后,将洗液放回原瓶中, |7 ]9 b0 _& X
用吸量管吸取溶液的方法?
用右手的拇指和中指捏住移液管或吸量管的上端,将管的崐下口插入欲取的溶液中,插入不要太浅或太深,太浅会产生吸空,把溶液吸到洗耳球内弄脏溶液,太深又会在管外沾附溶液过多.+ D: _) a* V5 D9 }
使用吸量管和滴定管注意事项?
在精密分析中使用的移液管和吸量管都不允许在烘箱崐中烘干.(2)移液管与容量瓶常配合使用,因此使用前常作两者的崐相对体积的校准.(3)为了减少测量误差,吸量管每次都应从最上崐面刻度为起始点,往下放出所需体积,而不是放出多少体积就吸取崐多少体积