OMA Protocol Review: OMAMAN-56 Sulfites in Shrimp

6. Recommendations for use

1. Proceed to equipment Reconditioning, Activation and Calibration right before beginning the analysis, on a daily basis, and with well-tempered Solutions, Reagents and Biotest. 2. In each process, ensure that the three components of the electrochemical cell (Biotest, reference electrode and counter electrode) are well-submerged in the SUL Measurement Solution and that the reference electrode is well-connected. If a breakdown occurs with the reference electrode, or if work is carried out without it being connected, it will be detected that the current intensity inside is very unstable and with variable intensity peaks. If this is the case, stop the measurement and discard both the Biotest and the reference electrode. 3. The main screen Stand By option is used when an intentional pause is to be taken in the analysis routine. To test the calibration status, analyze the SUL Standard 3 or the Verifying Solution before proceeding to measure the samples. 4. If the result of an analysis is higher than the upper limit of the Measurement Range being worked in (for example, a value of 50 mg/kg in the range of 7-30 mg/kg), change the content of the cuvette and put the equipment into Stand by mode for 30 seconds before moving forward with the following analysis. 5. It is important to store the reference electrode in the Storage Solution supplied along with the electrode (4M KCl) and in a vertical position whenever not in use. Improper storage may lead to deterioration over a short space of time.

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