Improvements in or relating to testing for the presence of a component in liquors

摘要

A method of testing for a component in liquors comprises the intermittent withdrawal of a small fixed quantity of liquor to be tested, and mixing it with a continuously flowing test reagent, the interval between withdrawal being controlled by and proportional to the intensity of colorimetric reaction with the test reagent. An embodiment uses plutonium nitrate liquor containing component nitrite ion, and using test reagent starch iodide. As shown in the Figure, solution flowing in duct 10 is forced by restriction 15 to pass through sample pipe 13 containing electromagnetic valve 14 with outlet connection 16 feeding to test cell 20 through which test reagent flows continuously via pipe 19. Photocells 24 and 26 corresponding to test cell 20 and standard 25 feed output to relay 29 which at colorimetric balance closes contact 30, operating pulse generator 31 which opens valve 14 to admit the next sample; the alarm 34, operates when the intervals between pulses are too long or too short, i.e. when there is either excess or virtually no component present.