Luminescence study of europium(III) complexes with several dicarboxylic acids in aqueous solution

1995 ◽  
Vol 225 (1-2) ◽  
pp. 257-260 ◽  
Author(s):  
Stefan Lis ◽  
Gregory R. Choppin
Keyword(s):  
Aqueous Solution ◽  
Dicarboxylic Acids ◽  
Luminescence Study

Kinetics of complex formation between some dicarboxylic acids and iron(III) in aqueous solution

1977 ◽  
Vol 22 ◽  
pp. 61-67 ◽  
Author(s):  
G. Calvaruso ◽  
F.P. Cavasino ◽  
E.Di Dio ◽  
R. Triolo
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Dicarboxylic Acids ◽  
Kinetics Of

scholarly journals Thermodynamic properties and cloud droplet activation of a series of oxo-acids

2010 ◽  
Vol 10 (13) ◽  
pp. 5873-5890 ◽  
Author(s):  
M. Frosch ◽  
A. A. Zardini ◽  
S. M. Platt ◽  
L. Müller ◽  
M.-C. Reinnig ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Cloud Condensation Nuclei ◽  
Cloud Droplet ◽  
Dicarboxylic Acids ◽  
Atmospheric Particulate Matter ◽  
Flow Tube ◽  
Order Of Magnitude ◽  
Ccn Activity

Abstract. We have investigated the thermodynamic properties of four aliphatic oxo-dicarboyxlic acids identified or thought to be present in atmospheric particulate matter: oxosuccinic acid, 2-oxoglutaric acid, 3-oxoglutaric acid, and 4-oxopimelic acid. The compounds were characterized in terms of their cloud condensation nuclei (CCN) activity, vapor pressure, density, and tendency to decarboxylate in aqueous solution. We deployed a variety of experimental techniques and instruments: a CCN counter, a Tandem Differential Mobililty Analyzer (TDMA) coupled with a laminar flow-tube, and liquid chromatography/mass spectrometry (LC/MS). The presence of the oxo functional group in the α-position causes the vapor pressure of the compounds to diminish by an order of magnitude with respect to the parent dicarboxylic acid, while the CCN activity is similar or increased. Dicarboxylic acids with an oxo-group in the β-position decarboxylate in aqueous solution. We studied the effects of this process on our measurements and findings.

scholarly journals Glassy aerosols with a range of compositions nucleate ice heterogeneously at cirrus temperatures

2012 ◽  
Vol 12 (18) ◽  
pp. 8611-8632 ◽  
Author(s):  
T. W. Wilson ◽  
B. J. Murray ◽  
R. Wagner ◽  
O. Möhler ◽  
H. Saathoff ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Citric Acid ◽  
Glassy State ◽  
Dicarboxylic Acids ◽  
Active Surface ◽  
Ice Nucleation ◽  
Dust Particles ◽  
Chemical Compositions ◽  
Tropical Tropopause ◽  
Cloud Models

Abstract. Atmospheric secondary organic aerosol (SOA) is likely to exist in a semi-solid or glassy state, particularly at low temperatures and humidities. Previously, it has been shown that glassy aqueous citric acid aerosol is able to nucleate ice heterogeneously under conditions relevant to cirrus in the tropical tropopause layer (TTL). In this study we test if glassy aerosol distributions with a range of chemical compositions heterogeneously nucleate ice under cirrus conditions. Three single component aqueous solution aerosols (raffinose, 4-hydroxy-3-methoxy-DL-mandelic acid (HMMA) and levoglucosan) and one multi component aqueous solution aerosol (raffinose mixed with five dicarboxylic acids and ammonium sulphate) were studied in both the liquid and glassy states at a large cloud simulation chamber. The investigated organic compounds have similar functionality to oxidised organic material found in atmospheric aerosol and have estimated temperature/humidity induced glass transition thresholds that fall within the range predicted for atmospheric SOA. A small fraction of aerosol particles of all compositions were found to nucleate ice heterogeneously in the deposition mode at temperatures relevant to the TTL (<200 K). Raffinose and HMMA, which form glasses at higher temperatures, nucleated ice heterogeneously at temperatures as high as 214.6 and 218.5 K respectively. We present the calculated ice active surface site density, ns, of the aerosols tested here and also of glassy citric acid aerosol as a function of relative humidity with respect to ice (RHi). We also propose a parameterisation which can be used to estimate heterogeneous ice nucleation by glassy aerosol for use in cirrus cloud models up to ~220 K. Finally, we show that heterogeneous nucleation by glassy aerosol may compete with ice nucleation on mineral dust particles in mid-latitudes cirrus.

scholarly journals Thermodynamic properties and cloud droplet activation of a series of oxo-acids

2010 ◽  
Vol 10 (2) ◽  
pp. 3755-3805 ◽  
Author(s):  
M. Frosch ◽  
A. A. Zardini ◽  
S. M. Platt ◽  
L. Müller ◽  
M.-C. Reinnig ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Cloud Condensation Nuclei ◽  
Cloud Droplet ◽  
Dicarboxylic Acids ◽  
Atmospheric Particulate Matter ◽  
Flow Tube ◽  
Order Of Magnitude ◽  
Ccn Activity

Abstract. We have investigated the thermodynamic properties of four aliphatic oxo-dicarboyxlic acids identified or thought to be present in atmospheric particulate matter: oxosuccinic acid, 2-oxoglutaric acid, 3-oxoglutaric acid, and 4-oxopimelic acid. The compounds were characterized in terms of their cloud condensation nuclei (CCN) activity, vapor pressure, density, and tendency to decarboxylate in aqueous solution. We deployed a variety of experimental techniques and instruments: a CCN counter, a Tandem Differential Mobililty Analyzer (TDMA) coupled with a laminar flow-tube, and liquid chromatography/mass spectrometry (LC/MS). The presence of the oxo functional group in the α-position causes the vapor pressure of the compounds to diminish by an order of magnitude with respect to the parent dicarboxylic acid, while the CCN activity is similar or increased. Dicarboxylic acids with an oxo-group in the β-position were found to decarboxylate in aqueous solution.

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