The linear range and the results of sample analysis are satisfactory ( t =1.761, P >0.05) . [Conclusion] We suggest that this method be extended and adopted.

• 该方法简单、快速,有良好的准确度和灵敏度,其线性范围及测定样品的结果与现行的比色法,差异无显著性(t=1。761,P>0。05)。[结论]建议推广和应用该方法。