A topographic target light scattering-differential optical absorption spectroscopy （＇IbTaL-DOA~） system is de- veloped for measuring average concentrations along a known optical path and studying surface-near distr...A topographic target light scattering-differential optical absorption spectroscopy （＇IbTaL-DOA~） system is de- veloped for measuring average concentrations along a known optical path and studying surface-near distributions of atmospheric trace gases. The telescope of the ToTaL-DOAS system points to targets which are located at known dis- tances from the measurement device and illuminated by sunlight. Average concentrations with high spatial resolution can be retrieved by receiving sunlight reflected from the targets, A filed measurement of NO2 concentration is performed with the ToTaL-DOAS system in Shijiazhuang in the autumn of 2011. The measurement data are compared with con- centrations measured by the point monitoring technique at the same site. The results show that the ToTaL-DOAS system is sensitive to the variation of NO2 concentrations along the optical path.展开更多
稳定同位素质谱法(Stable Isotope Ratio Mass Spectrometry,IRMS)是一种质谱技术,专注于测量样品(如食品)中的碳、氮和氢等元素的稳定同位素比率。通过分析食品样品中特定元素的稳定同位素组成,IRMS能够追踪食品的来源并验证其真实性...稳定同位素质谱法(Stable Isotope Ratio Mass Spectrometry,IRMS)是一种质谱技术,专注于测量样品(如食品)中的碳、氮和氢等元素的稳定同位素比率。通过分析食品样品中特定元素的稳定同位素组成,IRMS能够追踪食品的来源并验证其真实性。本文通过介绍稳定同位素质谱技术的原理、技术分类,并分析其在食品掺假检测和产品溯源中的应用,旨在为检验人员和监管部门提供技术指导和理论支持。展开更多
基金Project supported by the National High Technology Research and Development of China (Grant No.2009AA063006)the National Natural Science Foundation of China (Grant No. 40905010)the Special Project of Environmental Nonprofit Industry Research,China (Grant No. 201109007)
文摘A topographic target light scattering-differential optical absorption spectroscopy （＇IbTaL-DOA~） system is de- veloped for measuring average concentrations along a known optical path and studying surface-near distributions of atmospheric trace gases. The telescope of the ToTaL-DOAS system points to targets which are located at known dis- tances from the measurement device and illuminated by sunlight. Average concentrations with high spatial resolution can be retrieved by receiving sunlight reflected from the targets, A filed measurement of NO2 concentration is performed with the ToTaL-DOAS system in Shijiazhuang in the autumn of 2011. The measurement data are compared with con- centrations measured by the point monitoring technique at the same site. The results show that the ToTaL-DOAS system is sensitive to the variation of NO2 concentrations along the optical path.
文摘稳定同位素质谱法(Stable Isotope Ratio Mass Spectrometry,IRMS)是一种质谱技术,专注于测量样品(如食品)中的碳、氮和氢等元素的稳定同位素比率。通过分析食品样品中特定元素的稳定同位素组成,IRMS能够追踪食品的来源并验证其真实性。本文通过介绍稳定同位素质谱技术的原理、技术分类,并分析其在食品掺假检测和产品溯源中的应用,旨在为检验人员和监管部门提供技术指导和理论支持。
