Abstract：The accurate determination of methanesulfonic acid content in methanesulfonic acid tin electroplate liquid is of great significance for the stable production of tin plate and aging evaluation of electroplate liquid. BEH Amide chromatographic column (3.0×150 mm, 1.7 μm) was used. The mobile phase was 0.010 mol/L ammonium acetate acetonitrile solution-0.010 mol/L ammonium acetate aqueous solution (volume ratio of 80∶20). The flow rate was controlled at 0.40 mL/min. Thus, a determination method of methanesulfonic acid in methanesulfonic acid tin electroplate liquid was established by ultra-high performance liquid chromatography. The interference tests showed that the determination of methanesulfonic acid was not affected by other coexisting components in methanesulfonic acid tin electroplate liquid. When the mass concentration of methanesulfonic acid was in range of 1.00-10.00 mL/L, the logarithm of its mass concentration was linear to the logarithm of its corresponding peak area with linear correlation coefficient of 0.999 6. The proposed method was applied to the determination of methanesulfonic acid in actual sample of methanesulfonic acid tin electroplate liquid. The relative standard deviation (RSD, n=11) was 0.79%-1.2%, and the recoveries were between 99% and 102%. The synthetic sample of methanesulfonic acid tin electroplate liquid was prepared according to its formula system and determined by determined by the proposed method. The results were consistent with the theoretical values.
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