IC Determination of Cl^- and SO₄^2- in Water Samples of Hydraulic Engineering

Water sample of hydraulic engineering was filtered, and separated by IC, using TSKgel IC-Anion-PW_XL PEEK anionic column as separation column, and 2.5 mmol·L^-1 sodium tetraborate solution (pre-adjusted to pH 10.5 with ethylenediamine) as eluant. Non-restrain conductance detector was used in the determination. Linear relationships between values of peak area and mass concentration of Cl^- and SO₄^2- were kept in the same range of 2.50-50.00 mg·L^-1, with detection limits (3S/N) of 5.1, 7.6 μg·L^-1 respectively. Precision of the method was tested with blank water sample for 5 determinations, values of RSD's (in terms of peak area) found for Cl^- and SO₄^2- were 4.1% and 2.3%, respectively. Values of recovery found by standard addition method were in the range of 97.9%-102%.