Analytical Science Division, National Physical Laboratory, Teddington, TW11 0LW, UK.
Environ Sci Technol. 2011 Sep 15;45(18):7812-8. doi: 10.1021/es201454u. Epub 2011 Aug 26.
The short- and long-term memory effects associated with measurements of mercury vapor in air using gold-coated silica adsorption tubes have been described. Data are presented to quantify these effects and to determine their dependence on certain relevant measurement parameters, such as number of heating cycles used for each analysis, age of adsorption tube, mass of mercury on adsorption tube, and the length of time between analyses. The results suggest that the long-term memory effect is due to absorption of mercury within the bulk gold in the adsorption tube, which may only be fully liberated by allowing enough time for this mercury to diffuse to the gold surface. The implications of these effects for air quality networks making these measurements routinely has been discussed, and recommendations have been made to ensure any measurement bias is minimized.
本文描述了使用金涂覆的硅胶吸附管测量空气中汞蒸气时的短期和长期记忆效应。提供的数据用于量化这些效应，并确定它们对某些相关测量参数的依赖性，例如每个分析使用的加热循环次数、吸附管的年龄、吸附管上的汞质量以及分析之间的时间长度。结果表明，长期记忆效应是由于汞在吸附管内的大块金中的吸收所致，只有通过足够的时间让这些汞扩散到金表面，才能完全释放出来。讨论了这些效应对常规进行这些测量的空气质量网络的影响，并提出了建议，以确保最小化任何测量偏差。
