Atmosphere peroxide analysis

A detailed analysis of the atmospheric measurements over Antarctica by Anderson et al. (19) indicates that the cycle comprising reactions 17 -19 (the chlorine peroxide cycle) accounts for about 75% of the observed ozone depletion, and reactions 21 - 23 account for the rest. While a clear overall picture of polar ozone depletion is emerging, much remains to be learned. For example, the physical chemistry of the acid ices that constitute polar stratospheric clouds needs to be better understood before reliable predictions can be made of future ozone depletion, particularly at northern latitudes, where the chemical changes are more subtle and occur over a larger geographical area. 

X. Xu, A.M. van der Craats, E.M. Kok and P.C.A.M. de Bruyn, Trace analysis of peroxide explosives by high performance liquid chromatography — atmospheric pressure chemical ionization — tandem mass spectrometry (HPLC-APCl-MS/MS) for forensic applications ,... 

Analysis of peroxyacetic acid in the presence of hydrogen peroxide in workplace atmosphere has been reported (Hecht et al. 2004). The procedure involves sampling hydrogen peroxide on a quartz fiber filter impregnated with titanium oxysulfate hydrate. After the removal of hydrogen peroxide, the air is passed through a tube filled with silica gel soaked with methyl p-tolylsulfoxide for the... 

Overall the vinyl, phenyl, and ethynyl-alkyl hydroperoxides and methylperoxides do not exist as stable species under atmospheric conditions and its life time scales of seconds. Determination of the enthalpies of formation provides analysis of the relative bond strengths in these species and subsequent information concerning the reactions of peroxide radicals, which are important in both combustion and atmospheric chemistry of hydrocarbons. Reactions of... 

Frebel, A. (2007) Discovery of HE 1523-0901, a strongly r-process-enhanced metal-poor star with detected uranium. The Astrophysical Journal 660, L117. doi 10.1086/518122 Fricke,H. (1934) Reduction of oxygen to hydrogen peroxide by the irradiation of its aqueous solution with X-rays. Journal of Chemical Physics 2, 556-557 Friedfeld S., M. Fraser, K. Ensor, S. Tribble, D. Rehle, D. Leleux and F. Tittel (2002) Statistical analysis of primary and secondary atmospheric formaldehyde. Atmospheric Environment 36, 4161—Alls... 

Pretreated (enzymatic and enzymatic-I-hydrogen peroxide) knitted wool fabrics were treated with argon and atmospheric air plasma to improve adsorption capacity (Demir et al., 2010). After plasma treatment, a chitosan solution was appUed for antimicrobial effect. The treated fabrics were evaluated in terms of washing stabiUty as well as antimicrobial activity. The surface morphology was characterized by SEM images and Fourier transform infrared (FilR) analysis. The results indicate that the atmospheric plasma treatment had an etching effect and increased the fiinctionahty of wool surface. Atmospheric plasma treatment also enhanced the adhesion of chitosan to the surface and improved the antimicrobial activity. 

When lipoprotein are subjected to the attack of peroxyl radicals, thermally induced from aqueous solutions of azo-initiator 2,2 -azobis (2methylpropionamidine).dihydrochloride (AAPH), the lipoperoxidation occurs according to a radical pathway (Litescu et al, 2002 Tache et al, 2011) leading to lipo-peroxides formation on the LDL layer. In our experiments the FTIR analysis was performed first on the LDL deposed on the solid support, then the LDL was subjected to free radicals attack for 10 minutes, allowed to dry on inert atmosphere and after that the oxidised LDL layer was once more assessed by FTIR. 

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