Abstract: During Dec. 30, 2010 to Jan. 14, 2011, measurement of total gaseous mercury (TGM) concentrations was carried out by using a set of online atmospheric mercury analyzer developed by Zeng’s group at Caozhang station (E120°17′40″, N31°33′36″) in Wuxi, and the analyzer performanced well. The mean concentration over the sampling period was 7.37 ng/m³ with a range from 2.33 to 66.85 ng/m³. Some other elements in the ambient air could also be detected by the analyzer. Zinc which was probably released during metal smelting with mercury could be the reason, and this was provided by data analysis and lab experiment. It provides a way for promotion of the analyzer and makes the analyzer monitoring the particular source (smelting) of TGM possible after some improve-ments.

Key words: total gaseous mercury, mercury analyzer, zinc, Wuxi

摘要： 利用实验组自主研发的在线大气汞分析仪, 于2010年12月30日至2011年1月14日在无锡市曹张子站(E120°17′40″, N31°33′36″)对大气气态总汞(TGM)进行了连续监测。观测期间, 汞分析仪运行稳定, 测得无锡市TGM浓度范围为2.33~66.85 ng/m³, 平均值为7.37 ng/m³。观测中发现在线大气汞分析仪能够对环境大气中汞之外的其他物质产生信号响应。推测该物质为与汞同源排放于大气中的锌, 实验室加标实验及观测数据为该推测提供了正面支持。这一发现为日后仪器的改进提供了思路, 经进一步的证实和条件优化后有望实现在线大气汞分析仪同时监测大气中汞的特殊来源(金属冶炼)。

关键词: TGM, 汞分析仪, 锌, 无锡