以催化动力学方法测定痕量银已有多种报道,通常采用的是动力学固定时间法。我们发现采用动力学曲线斜率法可避免固定时间法中由于在动态下难以保证每次控制中止反应准确一致的固定时刻（动态下时间的误差会带来对应数据点较大的误差）,以及在每次固定时刻下测得对应的数据可能因不在动力学曲线线性范围内而带来的误差（引起工作曲线上各数据点所处条件不一致）。本文选用过硫酸钾作氧化剂,在 HAc-NaAc缓冲介质中,以 Catalytic kinetic methods for the determination of trace amounts of silver have been reported, usually using the kinetic time constant method. We found that using the dynamic curve slope method can avoid fixed time method in the dynamic because it is difficult to ensure that each control to stop the reaction exactly the same fixed time (dynamic time error will bring the corresponding data point larger error), and in The corresponding data obtained at each fixed time may be caused by errors that are not within the linear range of the kinetic curve (causing inconsistencies in the data points on the working curve). In this paper, potassium persulfate as oxidant, in HAc-NaAc buffer medium