纸吸管高锰酸钾消耗量的影响因素分析

Analysis of Influencing Factors on the Consumption of Potassium Permanganate in Paper Straws

关键词:  纸吸管  高锰酸钾消耗量  紫外可见分光光度计  淀粉

Key Words:paper straws  potassium permanganate consumption  Ultraviolet-visible spectrophotometer  starch

摘要:高锰酸钾（KMnO₄）消耗量作为食品接触用纸和纸板材料及制品安全的一个重要指标，反映从食品接触材料迁移到浸泡液中能被KMnO₄氧化物质的含量。本研究采用返滴定法测试纸吸管中KMnO₄消耗量，并探讨纸吸管中各因素对KMnO₄消耗量的影响。结果表明，配比高的漂白化学热磨机械浆制备纸张的KMnO₄消耗量大于配比低的；表面施胶淀粉的纸张KMnO₄消耗量高于未施胶，施胶量越大，KMnO₄消耗量越大。KMnO₄消耗量随着纸吸管层数和浸泡的面积/体积比（S/V）增大而提高。研究还表明，纸吸管的原纸中含有无害还原性物质以及其水解产物可能会迁移到水浸泡液中引起KMnO₄消耗量增加，但需要进一步深入研究。

Abstract:The consumption of potassium permanganate （KMnO₄） is an important safety indicator for food contact paper/cardboard materials and products， demonstrating the content of substances that can be oxidized by KMnO₄ during the migration from food contact material to soaking solution. In this study the back titration method was used to test the KMnO₄ consumption in paper straws and various factors influencing the KMnO₄ consumption in paper straws were discussed. The results showed that the KMnO₄ consumption of paper with high ratio of bleached chemical thermal mechanical pulp was greater than that of its low-ratio counterpart. Paper with external sizing consumed more KMnO₄ than that without sizing， the higher sizing agent content， the greater KMnO₄ consumption. The KMnO₄ consumption of paper straws increased as the number of layers and soaked area/volume ratio （S/V） increased. It was further showed that the paper straws base paper contained harmless reducing substances and their hydrolysates may migrate into the soaking solution and cause increased KMnO₄ consumption， which required further study.