Pollution source apportionment using combined elemental and real time particulate matter measurement
Particulate matter has attracted much attention as one of the key items in air pollution. In order to identify where the PM is being generated and the mechanism of release, it is critical to rapidly analyze material substances and their constituents. HORIBA developed the PX-375 to continuously measure mass concentration by the beta attenuation and element concentration by X-ray fluorescence (XRF). Development of our own unique filter tape (TFH-01L) has enabled PX-375 to measure mass and element concentration with high-sensitivity and time resolution. We confirmed favorable correlation results between the PX-375 and the inductively coupled plasma mass spectrometry method (ICP-MS). This presentation introduces the validity of field-testing using the PX-375.
The field testing of PX-375 has been conducted at multiple locations internationally. This presentation introduces a part of field testing results. From the field test results, the PX-375 has proven its effectiveness in its capability to monitor PM2.5 mass and element concentration. Conventional analysis techniques are unable to capture rapid outbreaks of unique element concentrations for given time periods due to high-cost and time consuming analysis procedure. The PX-375 provides continuous measurement with the high time resolution in the field and users are capable of understanding outbreaks by studying relative variation of element concentration. Long-term measurement will assist in the knowledge of changes in the outbreak source and the characteristics at a regional level.
Although the contribution of inorganic elements to the total PM mass is not significant, they can serve as trace elements in air source management since different contamination generation sources emit their unique inorganic elements.
For example, modeling with the Chemical Mass Balance method or the Positive Matrix Factorization method is a method to specify stationary sources in utilization of measurement data of inorganic elements, gaseous species such as Sulfur Dioxide, and Nitrogen Oxides.