Abstract
A new flow injection chemiluminescence system is developed for determination of anions like sulphate. The method is based on the displacement of an equivalent amount of bromide ion on a Br− from an ion-exchange minicolumn by sulphate. The released Br− then reacts with BrO3− in acidic medium to produce bromine water which catalyzes the Luminol/H2O2 chemiluminescence. Working conditions for these determinations were optimized. The emission intensities produced were recorded as peak height (mm) on a chart recorder and they were proportional to the amount of sulphate injected. This method allowed determination of 0.96mg/l SO42−.The developed FIA-CL system was applied for determination of sulphate in water (well and waste water) in different regions in Erbil City – North of Iraq. Interference effects of various anions were 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 and sensitive method for sulphate determination without any pretreatment. The present method was applied for sulphate and could be used for other ions with some improvement in the suppressor column.
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