Flow injection analysis with amperometric detection for iodide determination as a tracer in seawater reservoirs

Abstract

In this study, an electrochemical method was developed using flow injection analysis and amperometric detection with screen-printed electrodes for iodide determination as a tracer in seawater reservoirs. The amperometric method resulted in a good linear correlation coefficient (r = 0.9966) with a linear response over a concentration range of 1–10 mg L−1, a limit of detection of 0.2 mg L−1 and a quantification of 0.6 mg L−1. In addition, the method has been shown to be precise, linear and homoscedastic. The recovery for the amperometric method was 100 ± 3 %, and the recovery for the produced water samples fortified with iodide was 102 ± 2 %. The amperometric method did not show interference from other anions. Thus, the proposed method is promising for analysing the iodide content of seawater reservoir samples with simple and inexpensive methodologies compared with ion chromatography techniques.