Anguang's high-sensitivity real-time online measurement of atmospheric OH radicals
Posted on

[ China Instrument Network Instrument Development ] Recently, An Guangxie Xie Pinhua Researcher Group has made new progress in the field of high-sensitivity measurement of atmospheric OH radicals. The related research work is based on the tropospheric atmospheric OH radical field detection system based on laser-induced fluorescence technology. The "Development of a field system for measurement of tropospheric OH radical using laser-induced fluorescence technique" was published in the international journal published on Optics Express.

Schematic and physical map of OH radical laser induced fluorescence detection system
Atmospheric oxidation capacity is one of the key factors affecting regional pollution, global climate change and the atmospheric ecological environment. As the most important oxidant in the atmosphere during the day, OH radicals dominate the removal process of primary pollutants (CO, NOX, CH4, VOCs, SO2, etc.) and determine the lifetime and concentration distribution of trace gases in the troposphere; and trigger O3, PAN , CO2, HNO3, H2SO4 and OVOCS, SOA and other secondary pollutants and photochemical pollution, ozone pollution, acid rain and secondary aerosols and greenhouse effect. Due to its high activity and ultra-low concentration, direct and accurate measurement of OH radicals in the ambient atmosphere has been one of the most challenging research work in atmospheric chemistry.
On the basis of the laser-induced fluorescence technology (LIF) of the previous research, the research group Hu Renzhi and other researchers solved the problems of laser high-efficiency coupling, low-loss sampling, high-sensitivity fluorescence detection, quasi-determination, etc., and independently developed a set for the atmosphere. The OH radical external field measurement system was successfully applied to the Shenzhen long-term comprehensive field observation (STORM) from September 30 to November 11, 2018. This field observation demonstrated for the first time the high sensitivity, high time resolution and real-time online measurement performance of OH radicals, and effectively obtained the daily variation trend; in the photolysis rate with ozone (because ozone photolysis is OH free) The correlation analysis of the main source of the base has obtained a high correlation. The average peak concentration of OH radicals during the day is 6.6×106 cm-3, which indicates that the daytime photochemical process in Shenzhen is still strong.
The instrument can meet the measurement requirements of high-sensitivity and high time resolution real-time on-line detection of ambient atmospheric OH radicals. It can provide advanced technical means and equipment for studying atmospheric chemical processes, and further study the atmospheric chemical process of OH radicals and Data support is provided for scientific issues such as secondary pollution laws.
The research work was funded by the Ministry of Science and Technology's Atmospheric Special Project, the National Natural Science Foundation, and the Chinese Academy of Sciences' Ashes Pilot Project.
(Original title: Anguang's high-sensitivity real-time online measurement of atmospheric OH radicals)

Silica Anti-blocking Agent For Films

It is a highly efficient anti-blocking aid for plastic films. The treatment on these itmes improves the dispersibility and prevents discoloration in polyolefin additive formulations. It also provides slip improvement on films. Due to its high purity and low hardness its abrasiveness is negligible. In most countries SKYSIL AB Series is approved for the use in food packaging films. SKYSIL AB Series is mainly used for:

- polyethylene and polypropylene films
- PVC films
- films made from linear polyester.

Silica Anti-blocking Agent,Anti-blocking Agent,Plastic Fims Anti-blocking Agent; Anti-blocking Agent For Masterbacth

Guangzhou Quanxu Technology Co Ltd , https://www.skysilmattingagent.com