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As the widely used plant growth regulators,phenoxy carboxylic acids(PCAs)herbicides can be an important cause of health risks and hazards in animal and human life.A high throughput method was developed to rapidly determine PCAs in water samples by combing velvet-like graphitic carbon nitride(V-g-C3N4)nanoparticle extraction followed by direct analysis in real time mass spectrometry(DART-MS)for detection and quantitation.