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This invention discloses a method for rapid quantitative analysis of methamphetamine based on portable near-infrared spectroscopy and PLS modeling, characterized by: (1) collecting near-infrared diffuse reflectance spectra of methamphetamine crystals and tablets using a portable near-infrared analyzer, and preprocessing the spectral data using the S-G method; (2) performing data analysis and modeling based on the PLS method to obtain a PLS regression model; (3) detecting the sample to be tested: collecting the near-infrared diffuse reflectance spectra of the sample to be tested, and then obtaining the methamphetamine content in the sample to be tested according to the model in step (2).

This invention relates to the field of metal surface treatment technology, and more particularly to an aluminum alloy with a surface loaded with bio-based antibacterial components and its preparation method. The aluminum alloy is prepared by the following steps: anodizing the treated aluminum alloy to obtain an aluminum alloy with a nanotube pore structure; immersing the obtained nanotube pore structure anodic aluminum layer in a silane coupling agent solution for activation treatment to obtain a surface-activated aluminum alloy; immersing the surface-activated aluminum alloy in an epoxy resin solution containing antibacterial components and allowing it to stand for 10–12 hours, then removing the aluminum alloy and curing it at 70–75°C for 2–3 hours to obtain the aluminum alloy. The aluminum alloy prepared by this invention simultaneously loads two antibacterial components, palmatine and magnolol, onto the anodic oxide film layer, which synergistically produce a better inhibitory effect on fungi and bacteria.