氮中1μmol·mol^(-1)氧硫化碳气体标准物质长期稳定性研究

Long term stability of 1μmol·mol^(-1)carbonyl sulfide gas reference material in nitrogen

本文考察了低浓度氧硫化碳气体标准物质的长期稳定性,并对其长期稳定的影响因素进行探究。实验中采用称量法制备氮中1μmol·mol^(-1)氧硫化碳气体标准物质,分别使用内壁涂氟处理和普通铝合金无缝气瓶两种包装容器进行充装,考察了该标准物质连续6个月的长期稳定及变化规律。研究证明,在内壁未作处理的普通铝合金无缝气瓶内,微量水分会与氧硫化碳发生化学反应,导致氧硫化碳浓度降低;在内壁涂氟处理的铝合金无缝气瓶内,氧硫化碳能够保持良好的稳定性。

This paper investigates the long-term stability of low concentration carbonyl sulfide gas reference material and explores the factors on its long-term stability.In the experiment,1μmol·mol^(-1)carbonyl sulfide gas reference material in nitrogen was prepared by weighing method,and filled in two kinds of packaging containers,which were coated with fluoride coated aluminium alloy gas cylinders and untreated aluminium alloy gas cylinders.The results show that in the untreated aluminium alloy gas cylinders,trace moisture reacted with carbonyl sulfide,which reduces the carbonyl sulfide concentration;while in the coated with fluoride coated aluminium alloy gas cylinders,the carbonyl sulfide can maintain good stability.