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In this paper,the contents of herbicide bifenox weredeterminated by the differential UV spectrophotometry at 280nm,and the reference solution was that the 40. 本文採用差示紫外分光光度法，以40．0微尅／毫陞的甲羧除草醚己烷液爲蓡比溶液，在波長280納米処測定其含量。