关键词: 气态总汞, 金汞齐, 冷原子荧光法, 测汞仪

Abstract: Based on the method of gold amalgamation and CVAFS, the authors designed an instrument for continuously measuring total gaseous mercury in ambient air. The instrument operates with purified ambient air as carrier gas and does not require Argon or Nitrogen for detection. The sampling is run at about 1L/min, with sampling times of 10 min. Under these conditions, a detection limit of about 0.2ng/m³ is achieved. It has been showed that the relative standard deviations for 0.1 ng mercury vapor samples is less than 1.4%, and the linearity of calibration curve is quite well with the correlation coefficient of 0.9995. The instrument was used to continuously measure total gaseous mercury in the atmosphere at Peking University for about three weeks, observing an average concentration of TGM about 7.8ng/m³.

Key words: total gaseous mercury, gold amalgamation, cold vapor atomic fluorescence spectrometry, mercury analyzer