样品（2.000 0 g）经甲醇50 mL超声提取60 min，提取液用水稀释至100 mL，经0.22 μm滤膜过滤后进行色谱分离。以Agilent Eclipse plus C₁₈柱为固定相，50 mmol·L^-1柠檬酸缓冲液（pH 6.0）-甲醇（45+55）混合液为流动相。电化学检测器的检测池电压为400 mV（ECD1）和575 mV（ECD2）。双酚A的质量浓度在0.2~20.0 μg·L^-1内与其峰面积呈线性关系，检出限（3S/N）为3.3 μg·kg^-1。按标准加入法在3个浓度水平上进行回收试验，回收率在95.6%~98.2%之间，测定值的相对标准偏差（n=5）在2.1%~5.3%之间。

The sample (2.000 0 g) was extracted ultrasonically for 60 min with 50 mL of methanol, and the extract was diluted to 100 mL with water, and filtered through microporous membrane of 0.22 μm. The solution was then separated by HPLC using Agilent Eclipse plus C₁₈ chromatographic column as stationary phase and a mixture of 50 mmol·L^-1 citrate buffer solution (pH 6.0)-methanol (45+55) as mobile phase. The detection cell voltages of electrochemical detector were 400 mV (ECD1) and 575 mV (ECD2). Linear relationship between values of peak area and mass concentration of bisphenol A was found in the range of 0.2-20.0 μg·L^-1, with detection limit (3S/N) of 3.3 μg·kg^-1. Test for recovery was made by standard addition at 3 concentration levels, giving results in the range of 95.6%-98.2%, with RSDs (n=5) ranged from 2.1% to 5.3%.