在实际分析工作中，采用4-氨基安替比林分光光度法(HJ 503-2009)测定水质中挥发酚。实验结果显示，校准曲线的R2值经常达不到0.999以上，而且在同一次测量过程中数据的重复性差。从缓冲溶液的角度出发，探讨不同缓冲容量及用量对校准曲线的线性规律及数据的重复性的影响，并模拟实际水样进行分析，从而确定最佳的缓冲容量及用量。实验结果表明采用此缓冲容量及用量(缓冲溶液IV，用量2.0 ml)，校准曲线的R2值能达到0.999以上，且数据的重复性好。 In practical analysis work, 4-APP spectrophotometric method has been used for determinating volatile phenolic compounds of water. The experimental results show that the value of R2 of cali-brated curve is usually less than 0.999, and the repeatability of data is poor in the same experiment. From the point of buffer solution, the effects of different buffer capacities and dosages on the linear regularity of calibrated curve and the repeatability of data are investigated. Actual water samples are also simulated to determinate the best buffer capacity and dosage. The result of experiment shows that the value of R2 of calibrated curve is more than 0.999 and the repeatability of data is good with the mentioned buffer capacity and dosage (buffer solution IV, 2.0 ml).