摘要
实验自行搭建了一套基于X射线荧光光谱(XRF)的大气重金属分析仪,建立了大气颗粒物中多种重金属同时在线分析的方法,并通过测定标准膜片评估了方法的准确性、灵敏度、重复性以及检出限等。通过与国家标准方法采用的电感耦合等离子体质谱法(ICP-MS)的实验结果对比,结果表明方法能够较为准确的测定大气颗粒物中多种重金属的含量,相对误差在15%以内。采用实验仪器在线测定了一段时期室内外大气颗粒物中重金属的含量,并结合发布的空气质量指数(AQI)进行了初步分析,结果表明重金属与细颗粒物(PM2.5)含量具有一定正相关性;通过在广东某大气超级监测站一个月内的监测数据,证明了仪器实际应用的可靠性。通过上述方法的开发、参数评估以及简单应用,结合多种数据的交叉分析,表明实验方法能够满足日常的重金属监测需要。
An atmospheric heavy metal analyzer based on X-ray fluorescence spectrometry was configured by this experiment to establish a simultaneous on-line analysis method for multi heavy metals in atmospheric particulates. Method accuracy, sensitivity, repeatability and detection limit was assessed through determi-ning standard membrane. Through comparison with the experimental results of inductively coupled plasma mass spectrometry （ICP-MS） adopted by National standard method, it was verified that the method could determine the content of multi heavy metals in atmospheric particulates accurately with relative error smal- ler than 15 ~. The content of heavy metals in interior and exterior atmospheric particulates within certain period was determined on-line by the experiment instruments and analyzed preliminarily in combination with released air quality index （AQI）. The results showed that the content of heavy metal had certain pos- itive correlation with fine particulates （PM 2.5）. It proved that the reliability of the instrument practical application by monitoring data in a month at atmospheric super monitoring station in Guangdong. With the development, parameter assessment and simple application of the above method as well as cross analysis of multi data, it indicated that the experiment method was able to meet the demand of daily supervision on heavy metal.
出处
《冶金分析》
CAS
CSCD
北大核心
2015年第3期1-6,共6页
Metallurgical Analysis
基金
北京市科委项目(Z141106001014018)
