LOW PRESSURE ANION EXCHANGE CHROMATOGRAPHY-TURBIDIMETRIC METHOD FOR SIMULTANEOUS ONLINE ANALYSIS OF TRACE SULFIDE AND CHLORIDE IN WATER SAMPLES

摘要

The present invention provides a low pressure anion exchange chromatography—turbidimetric method for simultaneous online analysis of trace S²⁻ and Cl⁻ in water samples using an apparatus comprising a low pressure pump, a sample valve, a sample loop, a low pressure anion chromatographic column, a reactor, an optical flow cell, an optical detector, a computer system, a mixer, a sample flow path, a propelling solution flow path, and a color developer solution flow path, the method comprising: (a) mapping a baseline; (b) mapping spectrogram of S²⁻ and Cl⁻ in test samples; (c) mapping standard working curves; and (d) calculating the concentrations of S²⁻ and Cl⁻ in the test samples based on the peak heights of S²⁻ and Cl⁻ in the spectrogram and the regression equations of standard working curves. In this method, a chromatography method is combined with a turbidimetric method for the first time to realize simultaneous online analysis of trace S²⁻ and Cl⁻ in water samples, and the method is endowed with the advantages of fast analysis speed, high analysis efficiency and low analysis costs.