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目前,借助于光电比色计、火焰光度计等仪器进行某化学元素定量测定时,一般都需要预先绘制标准曲线.这些标准曲线的绘制习惯上是在专用坐标纸上进行,以纵坐标表示仪器读数,横坐标表示标准溶液浓度,然后根据自己配制的标准溶液浓度和仪器上的读数在坐标内找出相应的点,按照这些点的位置,作出一条曲线来代表溶液的浓度与仪器读数之间的关系.这样绘制,不可避免地存在着误差.如下面一组制作标准曲线的数据:
Currently, with the help of photoelectric colorimeter, flame photometer and other equipment for quantitative determination of a chemical element, generally need to draw a standard curve in advance.These standard curve is drawn on a dedicated coordinate paper, with the ordinate instrument Readings, abscissa indicates standard solution concentration, and then according to their own prepared standard solution concentration and readings on the instrument to find the corresponding point in the coordinates, according to the location of these points to make a curve representing the concentration of the solution and the instrument reading The relationship between the draw, inevitably there are errors, such as the following set of data to produce a standard curve: