称取0.500 0 g样品，用超纯水溶解并定容至200 mL，超声混匀10 min，依次用活化好的固相萃取柱净化和0.22 μm的针头式微孔滤膜过滤，采用离子色谱法测定滤液中的甲酸、乙酸、草酸、酒石酸、氨基磺酸、柠檬酸、盐酸、硫酸、硝酸和磷酸。以Dionex IonPac AS11-HC-4μm RFIC阴离子分析柱（4 mm×250 mm）和Dionex IonPac AG11-HC-4m RFIC阴离子保护柱（4 mm×50 mm）为固定相，以不同浓度的KOH溶液为流动相进行梯度洗脱。结果表明，10种阴离子的质量浓度在一定范围内与其峰面积呈线性关系，检出限（3S/N）在0.05~0.1 mg·L^-1之间。加标回收率在98.0%~103%之间，测定值的相对标准偏差（n=6）小于1.0%。

0.500 0 g of the sample was dissolved with ultrapure water and made up to 200 mL. After mixing by ultrasonic for 10 min, the solution was purified with activated solid phase extraction column and filtrated with 0.22 μm needle-type microporous membrane. Formic acid, acetic acid, oxalic acid, tartaric acid, sulfamic acid, citric acid, hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid in the filtrate were determined by ion chromatography. Dionex IonPac AS11-HC-4μm RFIC anion analytical column (4 mm×250 mm) and Dionex IonPac AG11-HC-4m RFIC anion guard column (4 mm×50 mm) were used as stationary phase, with different concentration of KOH solution as mobile phase for gradient elution. The results showed that the mass concentration of 10 anions was linear with the corresponding peak area within definite ranges, and the detection limits (3S/N) were between 0.05 and 0.1 mg·L^-1. Recovery obtained by standard addition method were between 98.0% and 103%, and the relative standard deviations (n=6) of the measured values were less than 1.0%.