聚酰胺56纤维中铜离子含量测定的影响因素分析

Analysis of Influencing Factors for Determination of Copper Ion Content in Polyamide 56 Fiber

分析样品制备、溶解和萃取的条件及步骤对聚酰胺56纤维中铜离子含量测定结果的影响。试验确定各步骤的优化条件如下:样品事先进行清洗,样品量为0.5~1 g;溶解聚酰胺56纤维的硫酸溶液的浓度为5~7 mol·L^(-1),溶解温度为50~80℃,溶解时间为50 min以上;萃取步骤的搅拌转速为600 r·min^(-1),采用中号转子,萃取时间为30 min,萃取液静置时间为8 min。以上优化条件下聚酰胺56纤维中铜离子含量测定结果较准确。

The influence of the conditions and steps of sample preparation,dissolution and extraction on the test results of copper ion content in polyamide 56 fiber was analyzed.The optimized conditions of each step were determined as follows:the sample was cleaned in advance,and the sample amount was 0.5~1 g;the concentration of sulfuric acid solution to dissolve polyamide 56 fiber was 5~7 mol·L^(-1),the dissolution temperature was 50~80℃,and the dissolution time was more than 50 min;in the extraction step,the stirring speed of was 600 r·min^(-1) using a medium rotor,the extraction time was 30 min,and the standing time of the extraction liquid was 8 min.The determination results of copper ion content in polyamide 56 fiber under above optimized conditions were accurate.