METHOD AND APPARATUS FOR MEASURING DEGREE OF PIGMENTATION BY DILUTION METHOD

PURPOSE:To provide a degree-of-pigmentation measuring method and apparatus employing the merit of a dilution method due to an organoleptic measuring method, easy in maintenance and capable of automating the control of water quality in the measurement of the degree of pigmentation used in the quality control of sewage treatment waste water or factory waste water. CONSTITUTION:The quantity of transmitted light of pure water W and that of a soln. M to be inspected prepared by diluting a sample S with pure water W are caught by a photodetector 13 and the dilution magnification D of the sample S in the soln. M to be inspected at a time when the difference between both outputs T, To of the photodetector 13 becomes a predetermined value DELTAT is set to the degree of pigmentation of the sample S. In the more concrete procedure of this measuring method, reference output T0 is obtained from pure water W with predetermined capacity FW and the sample S is added to pure water with capacity FW by an extremely small amt. to successively and continuously prepare solns. M to be inspected different in dilution magnification and the dilution magnification D is calculated from the total addition amt. FS of the sample S in the solns. M to be inspected lowered in the output T of the photodetector 13 from reference output T0 by the output difference DELTAT and the capacity FW of pure water W.