1、仪器的光学系统是由光栅和光电倍增管组成,光电倍增管的输出信号经放大后送到 A/ D 转换器,将模拟量转化为数字量。2、测定时,在待测溶液中加入少许试剂,用一支小试管吸取样品,再用另一支小试管滴加适当浓度的标准溶液,同时记录所消耗的体积。3、计算公式: A=(V- V)* C* T* V* C* T* V* C* T* V* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C* T* C