Online High Temporal Resolution Measurement of Atmospheric Sulfate and Sulfur Trioxide with a Light Emitting Diode and Liquid Core Waveguide-Based Sensor

Abstract

High temporal resolution components analysis is still a great challenge for the frontier of atmospheric aerosol research. Here, an online high time resolution method for monitoring soluble sulfate and sulfur trioxide in atmospheric aerosols was developed by integrating a membrane-based parallel plate denuder, a particle collector, and a liquid waveguide capillary cell into a flow injection analysis system. The BaCl solution (containing HCl, glycerin, and ethanol) was enabled to quantitatively transform sulfate into a well-distributed BaSO solution for turbidimetric detection. The time resolution for monitoring the soluble sulfate and sulfur trioxide was 15 h. The limits of detection were 86 and 7.3 μg L ( S/ N = 3) with a 20 and 200 μL SO solution injection, respectively. Both the interday and intraday precision values (relative standard deviation) were less than 6.0%. The analytical results of the certificated reference materials (GBW(E)08026 and GNM-M07117-2013) were identical to the certified values (no significant difference at a 95% confidence level). The validity and practicability of the developed device were also evaluated during a firecracker day and a routine day, obviously revealing the continuous variance in atmospheric sulfate and sulfur trioxide in both interday and intraday studies.

β-Ketoadipic acid production from poly(ethylene terephthalate) waste via chemobiological upcycling

“… 5 The cat operon genes for catechol-1,2-dioxygenase ( CatA ), muconate cycloisomerase ( CatB ), and muconolactone D isomerase ( CatC ), as well as PcaD , were inserted into the pKE112 vector to generate βKA from catechol through meta-cleavage. 14 For pKE112-catABCpcaD, DNA fragments from each gene were cloned sequentially using EcoRI , KpnI , BamHI , SbfI , and HindIII restriction enzymes. 15 pKM212-tphBAabc was also created by inserting four genes into five restriction enzyme sites.…”

Diurnal variations of gaseous and particulate nitrophenol isomers in the atmosphere monitored by using wet scrubbing online preconcentration

“…A parallel plate wet denuder (PPWD) made of plastic and a spray-type particle collector (PC) was developed to measure water-soluble inorganic acidic gases and anions in particles. [28][29][30][31] The PPWD/PC collection system was successfully applied even to polar organic compounds (carbonyls) to study their partitioning and diurnal variations. 32,33 Because NPs are polar and water-soluble like carbonyls, we tried to monitor gas and particle phase NPs using a PPWD/PC collection system.…”