MSc Nguyen Van Led, Horiba Vietnam Company introduced in the environmental engineering topic a set of equipment that can measure the metal of PM 2.5 dust in the air.
During the thematic discussion session “Environmental engineering” at the conference on environmental management in urban and industrial areas, held in October, the technology introduced by MSc Nguyen Van Led received attention because of its ability to determination of parameter concentrations of some toxic substances in PM 2.5 dust. The instrument can analyze elements such as potassium, zinc, calcium, vanadium, cadmium, manganese, sulfur, titanium, chromium, copper, nickel, iron, arsenic, mercury, lead… in PM 2.5 dust with volume. Compatible with ambient air quality monitoring systems. “Each pollution source has its own elemental composition characteristics, so it can be predicted by analyzing this elemental composition,” he said.
Mr. Lead said, automatic monitoring device named PX-375 is designed so that dust entering the system will be deposited in the filter (filter uses extremely low concentration background). The PTFE nonwoven fabric filter has precise sensitivity and performance. The machine also has a CMOC camera installed that allows viewing of the particle sample collected on the filter.
When dust is passed through the meter, the data analysis processor calculates the results and displays the results on the screen. The device applies proven technology in the world (as recommended by the US Environmental Protection Agency US EPA Method IO 3.3). The data is measured and analyzed directly, so the time to give results is fast, (can be set as short as 30 minutes), helping to continuously monitor the near-real-time trend.
Mr. Lead said that continuous monitoring technology by PX-375 has many benefits compared to traditional analytical methods (ICP/AAS). Traditional methods need to go through the steps of sampling, processing and analyzing samples. Samples that require in-depth sample analysis are expensive and take a long time to get results, so trends cannot be captured in time due to the high frequency required. With the PX-375, this process can shorten the time, give a lot of data, and measure the exact results without going through the sample processing stage. “Normal methods can take up to 2 weeks to give results, PX-375 helps to measure and alert immediately,” Mr. Tun said.
To demonstrate, he compared automatic monitoring data (PX-375) and manual analysis (ICP-MS) through the Titan (Ti) parameter in the air, published by the Japanese Ministry of the Environment. The PX-375 performs continuous measurement with a frequency of 4 hours / 1 result, while the manual method ICP-MS will measure 1 result in 24 hours. The technology of this PX-375 detected a spike in Ti levels during the day that the manual ICP-MS method could not detect.
According to Mr. Lead, this technology can be applied to analyze metal components to help detect inter-regional pollution. The team tested analyzes from two potential pollution sources, an oil-fired plant (A) and a copper smelter (B). When ordering the PX-375 to take samples and measure, the team discovered that the source of pollution came from the elements Vanadium and Nickel – components from the oil-fired plant (A). Through analyzing the prime factors in PM2.5 fine dust, the technology can detect whether there are many sources of pollution of the same type in the factory or there are sources of pollution of the same type around the study area.
Monitoring technology for metal components in PM2.5 fine dust can be applied to research on source distribution, continuous monitoring of transboundary and inter-regional haze pollution, forest fires, or environmental pollution reduction. market and improve the production process in the factory. Currently the technology is applied at HORIBA company (in Japan and Vietnam).