Automatic photometric titration procedure based on multicommutation and flow-batch approaches employing a photometer based on twin LEDs
TL;DR: In this paper, a reliable and inexpensive photometer based on twin LEDs assembled as a radiation source and as a photodetector is described, which is able to carry out photometric titration without using analytical curve.
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Abstract: In this work, a reliable and inexpensive photometer based on twin LEDs assembled as a radiation source and as a photodetector is described. The setup including the photometer and flow system module was designed to implement an automated titration procedure employing the multicommuted flow injection analysis (MCFIA) process. The proposed system was able to carry out photometric titration without using analytical curve to achieve the sample concentration. Its usefulness was proven by analyzing vinegar and lemon, orange, pineapple, maracock, and acajou juices. Accuracy was accessed comparing results with those obtained employing a manual procedure and no significant difference was observed at 95% confidence level. Samples presenting different acid concentrations such as lemon juice (1084.73 mmol L-1) and pineapple juice (14.42 mmol L-1) could be titrated using the same titration solution without any modification of the titrating setup.
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Citations
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References
Instrumentation and automated photometric titration procedure for total acidity determination in red wine employing a multicommuted flow system.
TL;DR: The usefulness of the proposed titration system was demonstrated by analyzing red wine samples and when results were compared with those obtained using the AOAC reference method, no significant difference was observed at the 95% confidence level.