Development of a Turbidimetric Sequential Injection System to Monitor the Codfish Desalting Process
2012
Santos, Inês C. | Mesquita, Raquel B. R. | Galvis-Sánchez, Andrea C. | Delgadillo, Ivonne | Rangel, António Osmaro S. S.
Salt-cured codfish represents an ancient process of preservation but requires the rehydration of the codfish with the correspondent salt removal. This work describes the development of a sequential injection system for the on-line turbidimetric determination of chloride during a simulated desalting process. The samples are directly aspirated to the manifold with no need for previous off-line treatments; this was possible due to the use on an in-line dialysis process; a quantification range from 50.0 mg/L to 20.0 g/L was established using the same manifold configuration. For monitoring the entire process, involving several chloride determinations (ca. 10), less than 3 mL of the desalting water was needed. Furthermore, the overall reagent consumption was quite low: 0.211 mg of AgNO3, 30.6 mg of HNO3, and 31.1 μg of PVA per determination. The accuracy of the system was evaluated by comparison with a potentiometric reference method. The determination rate was 28 and 31 h−1 according to the chloride concentration range. Several simulated desalting processes, under different conditions, were effectively monitored with the developed method.
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