Simultaneous determination of silicic acid, Ca, Mg and Al in mineral water and composite tablets by ion chromatography

摘要: A simple, selective and sensitive ion-chromatography method was investigated for simultaneously determining silicic acid, Ca2+, Mg2+, Al3+ anions (Cl− NO 3 − ) in real samples. It involved a single-column ion-chromatograph with sodium hydroxide-methanol-water eluent conductometric detection. Cations were converted to complex by adding EDTA the sample solution. set of well-defined peaks Al3+, Cl− obtained. Detection limits using 3.3σ (σ=standard deviation blank solution) 1.25×10−6 M H3SiO 4 , 1.32×10−6 1.28×10−6 1.33×10−6 1.31×10−6 1.24×10−6 . The successfully applied analysis mineral water composite tablets.