首页>
外国专利>
MEASUREMENT OF POLYVINYL PYRROLIDONE IN LAUNDRY DETERGENT AND COSMETIC PRODUCTS BY GC-NPD ANALYSIS
MEASUREMENT OF POLYVINYL PYRROLIDONE IN LAUNDRY DETERGENT AND COSMETIC PRODUCTS BY GC-NPD ANALYSIS
展开▼
机译:GC-NPD法测定洗衣粉和化妆品中的聚乙烯基吡咯烷酮
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method for quantitatively determining polyvinyl pyrrolidone present in low concentrations in detergent, cosmetic or other compositions, characterized by dissolving a sample of the composition in an organic solvent or an aqueous solution of an organic solvent, optionally removing by centrifugation any precipitate formed, pyrolyzing the diluted sample in a pyrolyzer (1), separating the pyrolysates in a gas chromatograph (4) and detecting the separated pyrolysates in a thermal ionic detector (7).
展开▼