A simple, rapid (8 min) ion chromatographic test method, using post-column electrolytic suppression, with conductivity detection, is validated for the quantification of Cl^-, NO₂^-, NO₃^-, SO₄^2- in river, dam, potable, waste water and in trade effluent, over the linear range: for chloride, for nitrite and nitrate, and for sulphate. The ion chromatographic separation was carried out using a Dionex Ion Pac^TM AS22-fast 4 µm column (4 × 150 mm), with a flow rate of 1.2 mL/min, using Na₂CO₃/NaHCO₃ (4.5 mM/1.4 mM) as eluent. The LOQ was in the range 0.025-0.50 mg/L, with an injection volume of 25 µL. The %RSD for retention time and peak area responses was <1%. Spiked recoveries were 87-107% for all 4 target anions. The method was suitable for routine drinking water quality assessment in line with the national regulations. The method was fully validated for accuracy, precision, recovery, LOQ, bias/trueness, selectivity, Measurement Uncertainty (MU), etc. The method validation data complied with the international requirements for testing laboratories for ISO/IEC 17025 accreditation.

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