Method for quickly detecting picric acid in water by liquid chromatography-tandem mass spectrum

The invention discloses a method for quickly detecting picric acid in water by a liquid chromatography-tandem mass spectrum. The method comprises the following steps of: 1, pretreating the obtained water sample; and 2, analyzing and determining the treated water sample by an ultra performance liquid chromatography-tandem mass spectrum combined technology. The used liquid chromatography instrumentis an Acquity ultra performance liquid chromatography (UPLC) system and the picric acid is separated from the sample by the Acquity UPLC bridged ethylene hybrid (BEH) hydrophilic interaction liquid chromatography (HILIC) chromatographic column. The HILIC is used to keep the picric acid on the chromatographic column, and the picric acid is separated and detected in three minutes. The labeling experiment proves that the recovery rate of a drinking water sample reaches 94 to 105 percent and the recovery rate of a waste water sample reaches 79 to 97 percent in the method, and the requirement of picric acid determination i