DETERMINACIóN SIMULTáNEA DE CATIONES MAYORITARIOS EN MUESTRAS DE AGUA RESIDUAL POR MEDIO DE CROMATOGRAFíA DE IONES CON DETECCIóN CONDUCTIMéTRICA

摘要

A methodology for the identification and simultaneous quantification of five cations using ion chromatography (IC) with conductivity detection was developed and validated. The method allows to monitor the content of sodium, ammonium, potassium, calcium and magnesium in wastewater samples from the Valle del Mezquital (Hidalgo, Mexico), despite that these contain high concentrations of sodium, main interfering ion for the quantification of ammonium, since both cations have very close retention times. Concentration levels achieved for quantification of the five analytes are between 1 to 100 mg/L, with low detection limits (≤ 0.6 mg/L), good precision (% relative standard deviation ≤ 3.0) and accuracy (between 98.0-114.5 %), as well as the absence of any interference.