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一光电比色计或分光光度计用于比色分析时,依据朗伯-比耳定律有 A=KC 式中, C-溶液中显色物质成份的浓度; A一溶液对某单色光的吸光度; K一该溶液的吸光系数。其中K值的大小,除与溶液性质有关外,还取决于比色仪器的性能结构。检定光电比色仪器的灵敏度和线性的基础是上述公式中的K值。例如对重铬酸钾溶液而言,如果C以μg·ml~(-1)为单位,则定义仪器对Cr~(+6)的比色灵敏度为 S=CoK 表示每Coμg·ml~(-1)铬含量浓度的溶液吸光度。对于玻璃滤光片滤色的光电比色计,Co取值
A photoelectric colorimeter or spectrophotometer for colorimetric analysis, according to Lambert-Beer’s law has A = KC formula, C-solution color material composition concentration; A solution of a monochromatic light Absorbance; K a light absorption coefficient of the solution. K value in which the size, in addition to the nature of the solution, but also depends on the performance of colorimetric instrument structure. The basis for determining the sensitivity and linearity of a photoelectric colorimetric instrument is the value of K in the above formula. For example, for potassium dichromate solution, if C is expressed in μg · ml -1, then the colorimetric sensitivity of the instrument to Cr ~ (+6) is defined as S = CoK, 1) Concentration of chromium solution absorbance. For the glass filter color filter photoelectric colorimeter, Co value