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

• Autor(a) principal: Oliveira,Sanair M. de
• Data de Publicação: 2014
• Outros Autores: Siguemura,Angelo, Lima,Hugo O., Souza,Flávia C. de, Magalhães,Alvaro A. O., Toledo,Roberta M., D'Elia,Eliane
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000800011
• topic: morpholine; corrosion inhibitors; amperometry; screen-printed electrodes; flow injection analysis

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.