Heterogeneous uptake of NO by sodium acetate droplets and secondary nitrite aerosol formation.

The high NO concentration in fine particulate matters (PM) during heavy haze events has attracted much attention, but the formation mechanism of nitrates remains largely uncertain, especially concerning heterogeneous uptake of NO by aqueous phase. In this work, the heterogeneous uptake of NO by sodium acetate (NaAc) droplets with different NO concentrations and relative humidity (RH) conditions is investigated by microscopic Fourier transform infrared spectrometer (micro-FTIR). The IR feature changes of aqueous droplets indicate the acetate depletion and nitrite formation in humid environment.

[Analysis of Water Soluble Organic Aerosol in Spring PM with Soot Particle Aerosol Mass Spectrometry (SP-AMS)].

To investigate the chemical composition and pollution characteristics of spring fine particles (PM) in Changzhou, a total of 84 PM samples were collected from March 1st to May 30th, 2017. We measured and analyzed conventional components, such as water-soluble ions (WSIIs) and carbonaceous components (OC and EC). The water-soluble organic aerosol (WSOA) was also analyzed by an aerodyne soot particle aerosol mass spectrometer (SP-AMS).

[Secondary Organic Aerosol Mass Yield and Characteristics from 4-ethylguaiacol Aqueous·OH Oxidation: Effects of Initial Concentration].

Aqueous-phase chemical processing, as an essential formation pathway of secondary organic aerosol (SOA), has attracted widespread attention from within atmospheric chemistry fields. Due to the complicated reaction nature, reaction mechanisms, and product characteristics of aqueous-phase chemical processing, its contribution to the SOA budget is still not fully understood. In this work, we investigate how the initial concentration (0.

[Day-night Characteristics of Humic-like Substances in PM During Winter in Changzhou].

To investigate the characteristics of diurnal variation of humic-like substances (HULIS) in atmospheric aerosols during winter in Changzhou, a total of 64 fine particle (PM) samples were collected from January 1 to February 28, 2017. In this study, the concentration as well as light absorption parameters of humic-like substances of carbon (HULIS-C) were examined. The results showed that the average day PM and HULIS-C concentrations were 122.

[Characteristics and Sources of Water-soluble Organic Carbon/Nitrogen in PM During Spring in Changzhou].

To understand the characteristics and sources of water-soluble organic carbon (WSOC) and organic nitrogen (WSON) in atmospheric aerosols during spring in Changzhou, 84 fine particle (PM) samples were collected from March 1 to May 30, 2017, in Changzhou. The water-soluble components, including water-soluble organic carbon, water-soluble total nitrogen (WSTN), water-soluble ions, and carbonaceous components (OC and EC), were analyzed. The levels of WSOC and WSON and their source characteristics were discussed.

[Secondary Organic Aerosols from Aqueous Reaction of Aerosol Water].

Liquid water (cloud/fog droplets and aerosols) is ubiquitous in the atmosphere and can provide an important reaction media for aqueous-phase chemical reactions. Gaseous precursors (mainly VOCs) or their gas-phase initial or first-generation oxidation products (including intermediate-volatility and semi-volatile organic compounds; I/SVOCs) can undergo chemical reactions in the atmospheric condensed phase (aqueous phase) to form low-volatility, highly oxidized organic matter[e.g.

[Day-Night Differences and Source Apportionment of Inorganic Components of PM During Summer-Winter in Changzhou City].

To investigate the day-night variation characteristics of inorganic components in atmospheric aerosol, PM samples were continuously collected for one month in Changzhou during summer and winter. Eleven water-soluble ions (WSⅡs) and 13 metal elements were compared in terms of their day-night character and sources. The results indicated that the day time average PM mass concentration was higher than the night time, while the percentage of the total WSⅡs in PM during the night was higher.

[Characteristics and Source Identification of Carbonaceous Aerosols in PM Measurements During Summer and Fall in Changzhou].

To better understand the characterization and sources of carbonaceous components, a total of 60 fine particle (PM) samples were collected in Changzhou during summer (July to August) and fall (October to November) of 2016. The average mass concentrations of PM, organic carbon (OC), and elemental carbon (EC) during this study period were observed to be 73.0, 14.

Template-Assisted Hydrothermal Growth of One-Dimensional Zinc Oxide Nanowires for Photocatalytic Application.

One-dimensional (1D) semiconductor ZnO nanowires have been successfully synthesized by a novel soft-chemical hydrothermal method with allylpolyethoxy amino carboxylate (AA-APEA) at low temperature. Their structure and properties have been characterized by a series of techniques, including X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM). It was found that ZnO nanowires with diameters around 50 nm and lengths up to about several micrometers are well-distributed.

The performance and evolution of bacterial community of activated sludge exposed to trimethoprim in a sequencing batch reactor.

The performance and microbial community changes of an activated sludge sequencing batch reactor were evaluated after exposure to trimethoprim for 51days. The average chemical oxygen demand, ammonia nitrogen, phosphorus efficiencies were 88.6%±0.