Flow injection analysis with amperometric detection for morpholine determination in corrosion inhibitors

Journal of the Brazilian Chemical Society

Sanair M. De Oliveira²  Angelo Siguemura²  Hugo O. Lima²  Flávia C. De Souza²  Alvaro A. O. Magalhães¹  Roberta M. Toledo¹  Eliane D'elia² 

[1] ,Universidade Federal do Rio de Janeiro Instituto de Química Rio de Janeiro RJ ,Brazil

关键词: morpholine;    corrosion inhibitors;    amperometry;    screen-printed electrodes;    flow injection analysis;   

DOI  :  10.5935/0103-5053.20140122

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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