硬聚氯乙烯(UPVC)饮水管材和管件中痕量锡的GFAAS测定研究

Determination of Trace Sn in Unplastized Polyvinyl Chloride Pipes for Drinking Water Supply by GFAAS

摘要: 目的建立测定硬聚氯乙烯(UPVC)饮水管材和管件中痕量锡的新方法.方法应用抗坏血酸作基体改进剂,横向塞曼石墨炉原子吸收光谱法直接测定浸泡液中痕量锡.结果选定了最佳测量条件,提高了方法的灵敏度、精密度.本法的最低检出量为93pg,回收率在94.0%～101.0%之间.对锡含量为6.0μg/L的浸泡液连续测定11次的相对标准偏差为4.6%.结论本法简便、快速、准确,灵敏度和精密度高.适用于硬聚氯乙烯(UPVC)饮水管材和管件中痕量锡的测定.

Abstract: Objective To find new methods to detect Sn in unplastized poly vinyl chloride pipes for drinking water supply.Methods L-Ascorbic acid is used as matrix modifier in the direct Zeeman GFAAS to determine trace Sn.Results The method detection limit is 9.3pg.The recovery is 94.0%-101.0%.The RSD obtained from the data of 11 determinations at the concentration level of 6.0 g/L is 4.6%.Conclusion This method is simple,quick,accurate and sensitive.It is a very good methods for measuring Sn in unplastized poly vinyl chloride pipes for drinking water supply.