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Improvement of sensitivity in flow analysis by exploiting a multi-reversed software-assisted system |
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| Authors: | José Y Neira Elizabeth González |
| Institution: | a Departamento de Análisis Instrumental, Facultad de Farmacia, Universidad de Concepción, Casilla 237, Concepción, Chile b Facultad de Ciencias, Departamento de Química Ambiental, Universidad Católica de la Santísima Concepción, Casilla 297, Concepción, Chile c Grupo de Análise Instrumental Aplicada, Departamento de Química, Universidade Federal de São Carlos, P.O. Box 676, 13560-970 São Carlos, SP, Brazil |
| Abstract: | A multi-reversed flow system software-assisted was developed for improvement of sensitivity in flow analysis. The performance of the flow system proposed was evaluated by using as a model the conventional Griess’ colorimetric reaction for determination of nitrite in waters. The manifold incorporated three 3-way solenoid valves, a relay box solenoid actuated, a peristaltic pump, and a photometric detector. A tailored software was designed and written in Visual Basic 6.0 which allows full control of all flow system components and simultaneous acquisition and processing of the data. The sensitivity measured as the slope of the calibration curve was improved 2.5- and 1.4-fold regarding those obtained by continuous- and stopped-flow systems, respectively. Other valuable features such as analytical throughput of 55 determinations per hour, limit of detection of 5 μg L−1 (3σblank/slope), relative standard deviation < 2% (n = 8), and a linear dynamic range up to 1800 μg L−1 were also achieved. |
| Keywords: | Software-assisted Multi-reversed flow Nitrite Water |
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