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with limits of detection and of quantification of 1 and 3 mg L -1 , respectively. Both methods showed to be accurate, linear, homoscedastic and their recoveries were 101 ± 2 and 100 ± 3%, respectively, while the recoveries for produced reservoir water samples (fortified with iodide) were 97 ± 7 and 100 ± 3%, respectively. High amounts of sulfate interfere in the spectrophotometric method. Both methods are promising, simple and inexpensive alternatives to ion chromatography for the detection of iodide tracer in produced water reservoir samples.

journal of the brazilian chemical society

A Comparison of Amperometric and Spectrophotometric Methods for the Iodide Concentration Measurement: a Tracer in Produced Water from Offshore Oil Reservoirs