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Abstract
In this study, an electrochemical method is proposed using flow injection analysis and amperometric detection with screen-printed carbon electrodes for morpholine determination to monitor the quality of morpholine-based commercial inhibitors and the residual concentration of inhibitors that control internal corrosion in oil industry pipelines. The amperometric method resulted in a strong linear correlation coefficient (r = 0.9941) with a linear response over a concentration range of 20-120 mg L-1, a limit of detection of 10 mg L-1 and a limit of quantification of 30 mg L-1. In addition, the method has been shown to be precise, linear and homoscedastic. The recovery for the amperometric method was 100 ± 6%, and the recovery for the real condensate sample was 99 ± 2%. Thus, the proposed method is promising for analysing morpholine-based commercial inhibitors in oil industry pipelines with simple and low-cost methodologies compared with ion chromatography techniques.
Highlights
The overall costs associated with corrosion were estimated to be around $276 billion per year in the U.S, according to the 2002 National Association of Corrosion Engineers report.[1]
The presence of an anodic peak was observed at approximately +1.0 V only in morpholine and correlated with the anodic processes of morpholine
The peak potential was shifted in a positive direction when the scan rate was increased, which confirms the irreversibility of the electrochemical process
Summary
The overall costs associated with corrosion were estimated to be around $276 billion per year in the U.S, according to the 2002 National Association of Corrosion Engineers report.[1] Corrosion is a major problem encountered in industry, especially in steam generation and pipeline systems. For example, corrosion inhibitors protect the internal linings of crude oil pipelines, gas pipelines, and boilers with great efficiency.[2] These inhibitors are used in oil refinement and production, water injection, and acidification in secondary recoveries and oil-well drilling fluids
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