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有报道将1000 mL和2000 mL的容量瓶改进为带分度刻度容量瓶,使容量瓶的细颈部分有额定容积±0.5%的刻度,为直接配制指定浓度的滴定液带来很大方便。但笔者认为,此改进方法还可进一步拓展完善,不只局限在1000 mL和2000 mL的容量瓶,可应用到较小体积容量瓶上,且细颈部分刻度也不只局限于额定容积的±0.5%之间,只要内径均匀,细颈部分均可有分度刻度。另外,制作工艺还有具体要求,其用途在仪器校正、溶液配制等方面还有很大拓展空间。
It has been reported that the 1000 mL and 2000 mL volumetric flasks have been modified to graduated graduated volumetric flasks so that the neck of the volumetric flask has a graduated scale of ± 0.5%, which greatly facilitates the direct preparation of titrations of specified concentrations . However, in my opinion, this improved method can be further developed and perfected. It is not limited to 1000 mL and 2000 mL volumetric flasks and can be applied to smaller volumetric flasks. The neck portion scale is not limited to ± 0.5 of rated volume %, As long as the uniform diameter, neck part can have graduation scale. In addition, the production process there are specific requirements, its use in the instrument calibration, solution preparation, there is still a great room for development.