1. detection method: Hubei provincial standards for the detection of non-class substances stipulate the detection methods of non-class substances, including high performance liquid chromatography, gas chromatography and mass spectrometry. These methods can quickly and accurately detect the existence of non-class substances and ensure the quality and safety of products.
2. Detection limit: The detection limit of all kinds of non-class substances is stipulated in the detection standard of non-class substances in Hubei Province, that is, the maximum allowable residue of non-class substances.