双金柱富集-原子荧光法测定天然气中汞含量的研究  

Determination of mercury in natural gas by double gold column enrichment-atomic fluorescence spectrometry

作　　者：李秀林 刘汗青 武梦琦 尹荣林 崔同昆 LI Xiu-lin;LIU Han-qin;WU Meng-qi;YIN Rong-lin;CUI Tong-kun(Ruili Customs,Ruili 678600,China;Tonghai County Environmental Monitoring Station,Tonghai 652700,China)

机构地区：[1]瑞丽海关,云南瑞丽678600 [2]通海县环境监测站,云南通海652700

出　　处：《天然气化工—C1化学与化工》2020年第4期104-107,共4页Natural Gas Chemical Industry

基　　金：原国家质量监督检验检疫总局科技项目(2016IK274);国家重点研发计划“国家质量基础的共性技术研究与应用”专项(2018YFF0215400)。

摘　　要：采用饱和汞蒸气发生器直接进样制作汞标线,利用双金柱富集取样-原子荧光法对中缅管输进口天然气样品进行测定。结果表明,中缅管输进口天然气中汞的含量较低,饱和汞蒸气发生器手动气密注射针直接进样制作汞标线,相关系数好,制作方法简单、方便、准确。采用填充双金柱的取样管对天然气中汞的富集效果好,双金柱取样管中吸附的汞在700℃高温热脱附装置中解析效果好,该取样管可作为天然气中微量汞测定的富集材料。双金柱富集-原子荧光法对天然气中微量汞的测定,检出限为0.14 ng/Nm^3,精密度<5%,加标回收率在87.1%~96.9%之间,测定方法干扰少,结果准确性高,操作简便,检测效率高,便于推广使用,可适用于天然气中微量汞的测定。Through using the saturated mercury vapor generator to directly inject sample to make mercury standard curve,the the content of mercury in the natural gas imported from China-Myanmar pipeline was determined by the double gold column enrichment-atomic fluorescence spectrometry.The results show that the content of mercury in this imported gas is low.The mercury standard curve made by direct injecting sample from the saturated mercury vapor generator with manual gas tight injection needle has good correlation coefficient,and the method is simple,convenient and accurate.The sampling tube filled with double gold column has a good enrichment effect on mercury in natural gas,and the mercury adsorbed in the sampling tube can be desorbed well at 700℃.The mercury absorbed in the sampling tube can be used as the enrichment material for the determination of trace mercury in natural gas.The detection limit is 0.14 ng/Nm^3,the precision is less than 5%,and the recovery of standard substance is between87.1%and 96.9%.This method has the advantages of less interference,high accuracy,simple operation,high detection efficiency and easy to be popularized.It can be applied to the determination of trace mercury in natural gas.

关 键 词：汞含量测定 天然气 双金柱富集 原子荧光法 

分 类 号：O657.3[理学—分析化学]