Published on August 2010 | Analytical Chemistry

Combination of FIA-CL Technique with ion-exchangerfor determination of sulphate in various water resourcesin Erbil City

A new flow injection chemiluminescence system is developed for determination of anionslike sulphate. The method is based on the displacement of an equivalent amount of bromide ion onaBrfrom an ion-exchange minicolumn by sulphate. The released Brthen reacts with BrO3inacidic medium to produce bromine water which catalyzes the Luminol/H2O2chemiluminescence.Working conditions for these determinations were optimized. The emission intensities producedwere recorded as peak height (mm) on a chart recorder and they were proportional to the amountof sulphate injected. This method allowed determination of 0.96 mg/l SO24.The developed FIA-CL system was applied for determination of sulphate in water (well andwaste water) in different regions in Erbil City – North of Iraq. Interference effects of various anionswere eliminated by inserting a suppressor minicolumn in the FIA-CL system after injection port,which allowed for sulphate only to pass through. The method provided a very simple, rapid andsensitive method for sulphate determination without any pretreatment. The present method wasapplied for sulphate and could be used for other ions with some improvement in the suppressor col-umn