Determination of ultra trace amounts of aldehydes in drinking water using surfactant modified alumina coated magnetic nanoparticles

A new simple and accurate method was developed for determination of low levels of formaldehyde (FA) and acetaldehyde (AA) in water samples by extraction of hydrazones derivatives of these aldehydes onto surfactant coated magnetic nanoparticles. Alumina was coated on the surface of magnetic nanoparticles (Fe3O4/Al2O3 NPs) and then was modified with sodium dodecyl sulfate (SDS). The experimental conditions such as amount of SDS, pH, adsorption time, desorption conditions and sample volume were optimized. This method was applied for determination ofconcentration of FA and AA in different types of Iranian drinking waters. Based on results bottled waters have more aldehyde content comparing tap and underground waters. Chemical laboratory waters (milli-Q and HPLC grade waters) have also some detectable amounts of aldehyde by thismethod.