From January to March 2015, an atmospheric aerosol measurement campaign, “Aerosoles en Ciudad Universitaria 2015” (ACU15), was carried out in Mexico City determine the particles’ optical properties and chemical composition. Two photoacoustic spectrometers measured scattering absorption coefficient at two different wavelengths. The average 532 nm 12.71 ± 9.48 Mm−1 870 10.35 7.36 Mm−1. 65.63 47.1...

Groundwater contamination in coastal areas has attracted widespread attention. However, studies on the hydrogeochemical characteristics and controlling mechanisms aquifers are still lacking. In this study, 71 sets of groundwater samples were collected during dry wet seasons a city, Shandong Province. Correlation principal component analyses used to identify pollution sources. Meanwhile, Piper d...

From neutral solutions, dimeric 1,3-propanediaminetetraacetato lanthanides (NH4)2[Ln2(1,3-pdta)2(H2O)4]·8H2O [Ln = La, 1; Ce, 2] and K2[Ln2(1,3-pdta)2(H2O)4]·11H2O [Ln = La, 3; Ce, 4] (1,3-H4pdta = 1,3-propanediaminetetraacetic acid, C11H18N2O8) were isolated in high yields. The reaction of excess strontium nitrate with 1 resulted in the formation of a two dimensional coordination polymer [La2(...

Novel CrZrOx catalysts were designed and synthesized by the co-precipitation method first time used for selective catalytic reduction of NOx with NH3 (NH3-SCR). The promotional effect ZrO2 on Cr2O3 was investigated. SCR performance significantly enhanced appropriate addition in CrZrOx, owing to formation solid solution structure Cr-O-Zr conjunction bonds. Among tested catalysts, catalyst Cr:Zr ...

Abstract. Aerosol acidity plays a key role in regulating the chemistry and toxicity of atmospheric aerosol particles. The trend pH its drivers is crucial understanding multiphase formation pathways aerosols. Here, we reported first analysis from 2011 to 2019 eastern China, calculated with ISORROPIA model based on observed gas compositions. implementation Air Pollution Prevention Control Action ...

Abstract. To better understand the origins and seasonality of atmospheric aerosols in North China, we collected fine (PM2.5) at an urban site (Nankai District, ND) a suburban (Haihe Education Park, HEP) Tianjin from July 2018 to 2019. The PM2.5 was studied for carbonaceous, nitrogenous ionic components stable carbon nitrogen isotope ratios total (δ13CTC) (δ15NTN). On average, mass concentration...

BACKGROUND Estimating the health effects of ambient air pollutant mixtures is necessary to understand the risk of real-life air pollution exposures. METHODS Pediatric Emergency Department (ED) visit records for asthma or wheeze (n = 148,256), bronchitis (n = 84,597), pneumonia (n = 90,063), otitis media (n = 422,268) and upper respiratory tract infection (URI) (n = 744,942) were obtained from...

Continuous measurements of meteorological parameters, gaseous pollutants, particulate matters, and the major chemical species in PM2.5 were conducted in urban Hangzhou from 1 September to 30 November 2013 to study the potential sources and formations of PM2.5 pollution. The average PM2.5 concentration was 69 μg ̈m ́3, ~97% higher than the annual concentration limit in the national ambient air qua...

We present a new estimate of the projected X-ray mass of Abell 1689 observed with Chandra, in an attempt to clarify the issue of whether or not there exists a discrepancy between X-ray and gravitational lensing mass estimates claimed in previous investigations based on Einstein, ROSAT and ASCA observations. A particular attention is paid to examining if there is an offset between X-ray centroid...