PHOTOMETRIC DETERMINATION METHOD FOR THE CHEMICALLY DEMANDED OXYGEN IN SEA WATER

摘要

The basic principle of this invention is: a) K2 Cr2 O7 completely oxidizes the organic substances which are found in high concentration dissolved in its volume, producing in this way a high intensity of colour. b) The precision of the photometric reading mechanism increases taking measurements from 65 to 95 percent T of its scale. Therefore, if a known amount of glucose known as COD is added to the sea sample, after having been previously appropriately diluted and with the use of type (I) the rate of COD can be deduced. This method has been found to have comparative results with the method of "Reflow of bi-coloured potassium". Advantages: Utilises the present photometric apparatus for which the given analysis would have needed to place a reflow apparatus, expensive glass implements, many reagents, the use of gas etc. It limits the amount of HgSO4 to 5 percent in the analysis and afterwards in the lab waste as Hg2C12. The speed and amount of the specified samples is larger.