用稀硝酸将水样（100.0 mL）的pH调整至4，加入2.5 g氯化钠和自制的磁性竹炭30 mg，旋涡振荡8 min，使双酚S吸附于磁性竹炭，丢弃水相，加入甲醇0.5 mL旋涡振荡2 min，使双酚S解吸并溶于甲醇中。所得溶液以Spherigel C₁₈色谱柱为固定相，以乙腈（55+45）溶液为流动相进行高效液相色谱分离和紫外检测。双酚S的质量浓度在0.1~20 μg·L^-1内与其峰面积呈线性关系，检出限（3S/N）为0.05 μg·L^-1。按上述方法测定1.0 μg·L^-1双酚S标准溶液7次，其测定值的相对标准偏差为5.6%。按标准加入法进行回收试验2次，回收率分别为88.7%，90.6%。

The water sample (100.0 mL) was adjusted to pH 4 with dilute nitric acid. 2.5 g of NaCl and 30 mg of self-prepared magnetic bamboo charcoal (MBC) were added into the sample solution. The above mixture was swirled for 8 min to have bisphenol S adsorbed on MBC. The aqueous phase was discarded. Methanol (0.5 mL) was added to the solid phase and the mixture was swirled for 2 min to desorb bisphenol S from MBC into methanol. The methanol solution was separated by HPLC using Spherigel C₁₈ chromatographic column as stationary phase, and a mixture of acetonitrile and H₂O (55+45) as mobile phase. UV-detection was adopted. Linear relationship between values of peak area and mass concentration of bisphenol S was found in the range of 0.1-20 μg·L^-1, with detection limit (3S/N) of 0.05 μg·L^-1. 1.0 μg·L^-1 standard solution of bisphenol S was determined by the above method for 7 times, giving value of RSD of 5.6%. Two determination were made in testing for recovery by standard addition method, values of recovery found were 88.7% and 90.6%.