scholarly journals Interaction of oxalic acid with methylamine and its atmospheric implications

RSC Advances ◽  
2018 ◽  
Vol 8 (13) ◽  
pp. 7225-7234 ◽  
Author(s):  
Yu Hong ◽  
Yi-Rong Liu ◽  
Hui Wen ◽  
Shou-Kui Miao ◽  
Teng Huang ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Atmospheric Aerosols ◽  
Dicarboxylic Acids

Oxalic acid, which is one of the most common dicarboxylic acids, is expected to be an important component of atmospheric aerosols.

scholarly journals Dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls in atmospheric aerosols from Mt. Fuji, Japan: Implication for primary emission versus secondary formation

2019 ◽  
Vol 221 ◽  
pp. 58-71 ◽  
Author(s):  
Bhagawati Kunwar ◽  
Kimitaka Kawamura ◽  
Shintaro Fujiwara ◽  
Pingqing Fu ◽  
Yuzo Miyazaki ◽  
...  
Keyword(s):  
Atmospheric Aerosols ◽  
Dicarboxylic Acids ◽  
Secondary Formation ◽  
Oxocarboxylic Acids

scholarly journals Aircraft observations of water-soluble dicarboxylic acids in the aerosols over China

2016 ◽  
Author(s):  
Yan-Lin Zhang ◽  
Kimitaka Kawamura ◽  
Ping Qing Fu ◽  
Suresh K. R. Boreddy ◽  
Tomomi Watanabe ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Organic Compounds ◽  
Aqueous Phase ◽  
Dicarboxylic Acids ◽  
Liquid Water Content ◽  
Water Soluble ◽  
Aircraft Observations ◽  
Volatile Organic ◽  
Intercontinental Transport ◽  
Surface Measurements

Abstract. Vertical profiles of low molecular weight dicarboxylic acids, related organic compounds and SOA tracer compounds in particle phase have not yet been simultaneously explored in East Asia, although there is growing evidence that aqueous phase oxidation of volatile organic compounds may be responsible for the elevated organic aerosols (OA) in the free troposphere. Here, we found consistently good correlation of oxalic acid, the most abundant organics globally, with its precursors as well as biogenic-derived secondary OA (SOA) compounds in Chinese tropospheric aerosols by aircraft measurements. Anthropogenically derived dicarboxylic acids (i.e., C5 and C6 diacids) at high altitudes were 4–20 times higher than those from surface measurements and even occasionally dominant over oxalic acid at altitude higher than 2 km, which is in contrast to the predominance of oxalic acid previously reported globally including the tropospheric and surface aerosols. This indicates an enhancement of tropospheric SOA formation from anthropogenic precursors. Furthermore, oxalic acid-tosulfate ratio maximized at altitude of ~2 km, explaining aqueous-phase SOA production that was supported by good correlations with predicted liquid water content, organic carbon and biogenic SOA tracers. These results demonstrate that elevated oxalic acid and related SOA compounds from both the anthropogenic and biogenic sources may substantially contribute to tropospheric OA burden over polluted regions of China, implying aerosol-associated climate effects and intercontinental transport.

scholarly journals Vertical distribution of particle-phase dicarboxylic acids, oxoacids and α-dicarbonyls in the urban boundary layer based on the 325-meter tower in Beijing

2020 ◽  
Author(s):  
Wanyu Zhao ◽  
Hong Ren ◽  
Kimitaka Kawamura ◽  
Huiyun Du ◽  
Xueshun Chen ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Oxalic Acid ◽  
Vertical Distribution ◽  
Organic Acids ◽  
Anthropogenic Activities ◽  
Ground Surface ◽  
Dicarboxylic Acids ◽  
Ground Level ◽  
Water Soluble ◽  
Motor Vehicles

Abstract. Vertical distribution of dicarboxylic acids, oxoacids, α-dicarbonyls, and other organic tracer compounds in fine aerosols (PM2.5) was investigated from the ground surface (8 m) to 260 m at a 325-meter meteorological tower in Beijing in the summer of 2015. Results showed that the concentrations of oxalic acid (C2), the predominant diacid, were more abundant at 120 m (210 ± 154 ng m−3) and 260 m (220 ± 140 ng m−3) than those at the ground level (160 ± 90 ng m−3). Concentrations of phthalic acid (Ph) decreased with the increase of heights, demonstrating that the vehicular exhausts at the ground surface was the main contributor. Positive correlations were noteworthy for C2/total diacids with mass ratios of C2 to main oxoacids (Pyr, ωC2) and α-dicarbonyls (Gly, MeGly) in polluted days (0.42 ≤ r2 ≤ 0.65), especially at the ground level. In clean days, the ratios of carbon content in oxalic acid to water soluble organic carbon (C2-C/WSOC) showed larger values at 120 m and 260 m than those at the ground surface. However, in polluted days, the C2-C/WSOC ratio mainly reached its maximum at the ground level. These phenomena may indicate the enhanced contribution of aqueous-phase oxidation to oxalic acid in polluted days. Combined with the influence of wind field, total diacids, oxoacids and α-dicarbonyls decreased by 22 %–58 % under the control on anthropogenic activities during the 2015 Victory Parade period. Furthermore, the PMF results showed that the secondary formation routes (secondary sulfate formation and secondary nitrate formation) were the dominant contributors (37–44 %) to organic acids, followed by biomass burning (25–30 %) and motor vehicles (18–24 %). In this study, the organic acids at the ground level were largely associated with local traffic emissions, while the long-range atmospheric transport followed by photochemical aging contributed more to diacids and related compounds in the boundary layer over Beijing than the ground surface.

scholarly journals Optical Absorption, Stability and Structure of NpO2+ Complexes with Dicarboxylic Acids

2005 ◽  
Vol 893 ◽  
Author(s):  
Guoxin Tian ◽  
Linfeng Rao
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Oxalic Acid ◽  
Coordination Mode ◽  
Iminodiacetic Acid ◽  
Dicarboxylic Acids ◽  
Oxydiacetic Acid

AbstractComplexation of NpO2+ with oxalic acid (OX), 2,2'-oxydiacetic acid (ODA), 2,2'-iminodiacetic acid (IDA) and 2,2'-thiodiacetic acid (TDA), has been studied using spectrophotometry in 1 M NaClO4. Both the position and the intensity of the absorption band of NpO2+ at 980 nm are affected by the formation of NpO2+/dicarboxylate complexes, providing useful information on the complexation strength, the coordination mode and the structure of the complexes.

scholarly journals REACTIVE EXTRACTION OF DICARBOXYLIC ACIDS I. MECHANISM, LIMITING STEPS AND KINETICS

1997 ◽  
Vol 5 (5) ◽  
pp. 97-110
Author(s):  
Dan Cascaval ◽  
Radu Tudose ◽  
Comeliu Oniscu
Keyword(s):  
Mass Transfer ◽  
Oxalic Acid ◽  
Succinic Acid ◽  
Transfer Process ◽  
Adipic Acid ◽  
Glutaric Acid ◽  
Butyl Acetate ◽  
Dicarboxylic Acids ◽  
Mass Transfer Process ◽  
Reactive Extraction

In this paper the reactive extraction of some dicarboxylic acids (oxalic acid, malonic acid, succinic acid, glutaric acid, and adipic acid) have been studied. These acids have been extracted by Amberlite LA-2 in butyl acetate using a modified extraction cell of the Lewis type. Mechanism, limiting steps, and kinetic of the mass transfer process have been settled.

scholarly journals Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer

2012 ◽  
Vol 9 (11) ◽  
pp. 4725-4737 ◽  
Author(s):  
K. Kawamura ◽  
K. Ono ◽  
E. Tachibana ◽  
B. Charriére ◽  
R. Sempéré
Keyword(s):  
Oxalic Acid ◽  
Arctic Ocean ◽  
Late Summer ◽  
Dicarboxylic Acids ◽  
Water Soluble ◽  
The Arctic ◽  
Marine Atmosphere ◽  
Marine Aerosols ◽  
Δ13c Values ◽  
The Arctic Ocean

Abstract. Oxalic and other small dicarboxylic acids have been reported as important water-soluble organic constituents of atmospheric aerosols from different environments. Their molecular distributions are generally characterized by the predominance of oxalic acid (C2) followed by malonic (C3) and/or succinic (C4) acids. In this study, we collected marine aerosols from the Arctic Ocean during late summer in 2009 when sea ice was retreating. The marine aerosols were analyzed for the molecular distributions of dicarboxylic acids as well as ketocarboxylic acids and α-dicarbonyls to better understand the source of water-soluble organics and their photochemical processes in the high Arctic marine atmosphere. We found that diacids are more abundant than ketoacids and α-dicarbonyls, but their concentrations are generally low (< 30 ng m−3), except for one sample (up to 70 ng m−3) that was collected near the mouth of Mackenzie River during clear sky condition. Although the molecular compositions of diacids are in general characterized by the predominance of oxalic acid, a depletion of C2 was found in two samples in which C4 became the most abundant. Similar depletion of oxalic acid has previously been reported in the Arctic aerosols collected at Alert after polar sunrise and in the summer aerosols from the coast of Antarctica. Because the marine aerosols that showed a depletion of C2 were collected under the overcast and/or foggy conditions, we suggest that a photochemical decomposition of oxalic acid may have occurred in aqueous phase of aerosols over the Arctic Ocean via the photo dissociation of oxalate-Fe (III) complex. We also determined stable carbon isotopic compositions (δ13C) of bulk aerosol carbon and individual diacids. The δ13C of bulk aerosols showed −26.5‰ (range: −29.7 to −24.7‰, suggesting that marine aerosol carbon is derived from both terrestrial and marine organic materials. In contrast, oxalic acid showed much larger δ13C values (average: −20.9‰, range: −24.7‰ to −17.0‰) than those of bulk aerosol carbon. Interestingly, δ13C values of oxalic acid were higher than C3 (av. −26.6‰) and C4 (−25.8‰) diacids, suggesting that oxalic acid is enriched with 13C due to its photochemical processing (aging) in the marine atmosphere.

The effect of the boiling process on the Oxalic acid content of some vegetables in the Syrian local market

2021 ◽  
pp. 5341-5344
Author(s):  
Alaa Alshikh Mohamad ◽  
Joumaa Al- Zehouri
Keyword(s):  
Trace Elements ◽  
Organic Compound ◽  
Oxalic Acid ◽  
Acid Content ◽  
Divalent Cations ◽  
Dicarboxylic Acids ◽  
The Body ◽  
Local Market ◽  
Boiling Process ◽  
Minerals And Trace Elements

Oxalic acid HOOC-COOH (OA) is the first in the homologous series of dicarboxylic acids. It is one of the most common acids present in vegetable world1, it is one of the abundant organic compound acts as an anti-nutrient present in most vegetables in various quantities. It is found as salts of insoluble complexes with divalent cations, minerals and trace elements. Oxalates react with calcium to precipitate calcium oxalate and accumulation of oxalates in the body prevents the absorption and utilization of calcium; which in turn causes calcium imbalance, rickets and osteomalacia. In the present study oxalate content of various vegetables commonly available in local market of Syria were determined and effect of boiling on oxalate content of selected vegetable were investigated. Most of the samples analyzed were contained more than 100mg/100g on dry weigh basis. The higher value of total oxalate content was found in Parsley (1466.82 mg/100g); spinach and Cabbage contain (478.7, 191.08 mg/100g). Boiling has shown reduction in total oxalate content and least reduction was obtained in Parsely leaves (28.33%) and highest reduction was obtained from Spinach (40.00%)

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