普遍使用的72型分光光度计与721型分光光度计尚有许多不足之处。例如,每测定一个样品,比色杯都必须用分析溶液洗数次,不但操作繁琐,影响分析速度,并且在更换分析溶液时,经常发生比色杯外壁为分析溶液所污染,不得不以擦拭的方法加以清 Commonly used type 72 spectrophotometer and 721 spectrophotometer there are still many shortcomings. For example, every time a sample is measured, the cuvette must be washed several times with the analytical solution. This not only complicates the operation but also affects the analysis speed. When the analytical solution is changed, the outer wall of the cuvette often becomes contaminated with the analytical solution, The method to be cleared