Patent ID: 9157899
Filing Date: 2015-10-13
Classification: B01J,G01N

Abstract:
1. A purifying agent for an oily liquid containing polychlorinated biphenyls, which is for removing, from the oily liquid, a substance which may interfere with an analysis of polychlorinated biphenyls contained in the oily liquid, said purifying agent comprising: a nitrate silica gel yielded by adding a mixed aqueous solution of copper nitrate and silver nitrate to an activated silica gel uniformly and subsequently drying the activated silica gel, wherein a ratio between the copper nitrate and the silver nitrate in the aqueous solution is adjusted to set the ratio by mole of the copper element to the silver element in the nitrate silica gel (the copper element:the silver element) into the range 1:0.5 to 1:2.0.