【摘要】 建立了两次金汞齐-冷原子荧光光谱法(CVAFS)测定大气中痕量气态总汞(TGM)的方法。研究表明:本方法的绝对检出限为2 pg;当以0.2~0.4 L·min-1 采样速度,采集12~48 h时,采样效率> 99%,精密度为9.63%;样品经2次循环加热分析,热解吸效率> 99%。这种分析方法还可以运用到其他环境样品痕量汞的测定。更多还原

【Abstract】 A new procedure to determine trace total gaseous mercury （TGM） in the atmosphere by two-stage gold amalgamation cold vapor atomic fluorescence spectroscopy was set up. The detection limit of this method is below 2 pg. When air has been pulled through a sampling trap at the flow rate of 0.2 0.4 L·min^-1 for 12 48 hours, the sampling efficiency of > 99% and precision of 9.63% are obtained, respectively. The thermal desorption efficiency of samples is > 99% through two analysis heating-cycles. This method also can be used to analyze trace mercury contents in other environmental samples.更多还原