How often should the calibration of the standard curve for COD measurement using the chromium method be performed?

2015-12-10View Original

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How often should the calibration of the standard curve for COD measurement using the chromium method be performed?

Reply #22015-12-10

If the chromium method for COD is a titration method, no standard curve is required; in other words, the standard solution remains valid for an extended period of time. If photometric methods are used, since the digestion process of COD lacks reproducibility, it is best to use the sample immediately after preparation. Since the digestion conditions for each sample and at each time are difficult to be exactly the same, it is not recommended to use a single standard curve over a long period of time.

Reply #32015-12-11

Online analysis is performed every 4 hours, with microwave heating used for digestion. Under what circumstances is it necessary to calibrate the standard curve?

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