超声萃取-酶解-树脂/活性炭吸附-分子质量校正联用测定洗衣片中聚乙烯醇(PVA)含量的研究OA

To address the complex matrix interference of polyvinyl alcohol(PVA)in laundry sheets,a high-preci-sion and high-sensitivity spectrophotometric detection method was established by integrating an ultrasonic extraction,enzy-matic hydrolysis,resin/activated carbon adsorption,molecular weight correction combined strategy.The interference was sig-nificantly eliminated by optimizing the boric acid-iodine colorimetric system(mass ratio of potassium iodide to iodine 1.38∶1.00,detection wavelength 688 nm),and combining the targeted degradation of polysaccharides by amylase/cellulase,ad-sorption of surfactants by anion exchange resin,and decolorization by activated carbon.To correct the absorbance deviation caused by the molecular weight effect difference of PVA,a multi-standard curve correction method was proposed,reducing the detection error of mixed samples from±25%to±5%.The method has a linear range of 0-50 mg/L(R2≥0.999 1),with a recovery rate of 95.50%-104.95%and a relative standard deviation(RSD)of≤1.50%,providing technical support for the precise quantification of PVA in multi-component laundry sheets.