Using a hydrophilic anion exchange chromatography column and a mixed solution of sodium carbonate-sodium bicarbonate and acetonitrile as the eluent, the separation of the iodide ion and thiocyanate peaks from the interference peaks in the sample was achieved; by selecting the UV detection mode, Higher sensitivity. Within the range of 0.05-1 mg / L, the concentration X of iodide ion and thiocyanate respectively has a good linear relationship with the corresponding chromatographic peak area Y. The linear equation of iodide ion is Y = 578.6X-2877, r = 1.0; The linear equation of thiocyanate is Y = 291.1X-3342, r = 0.9998. The detection limits of iodide ion and thiocyanate were 4.6μg / L and 14.6μg / L, respectively, and the recovery rate was 89.9%-106.9%.
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