Oxidation methods, comparison

Collins and Williams [30] have recently described a modification of Ehr-hardt s earlier photochemical method [57], which offers the practical advantages of speed, convenience, and the potential for real-time analyses. However, until the accuracy of the results is established, the method will not receive general acceptance. Collins and Williams [30] examined the completeness of oxidation of their photo-oxidation system using three independent methods, but pointed out that while essentially complete oxidation was indicated, definitive proof was lacking. A more satisfactory solution to the problem might be found through comparison of results of the photo-oxidation method with the dry-combustion method, which most analysts are willing to accept as complete [96]. 

Table 11.2. Comparison of the different oxidation methods for analysis of organic carbon in filtered and unfiltered seawater...

Gershey, R.M., M.D. MacKinnon, P.J. leB Williams, and R.M. Moore. 1979. Comparison of three oxidation methods used for the analysis of the dissolved organic carbon in seawater. Marine Chemistry 7 289-306. 

Bronk, D.A., M.W. Lomas, P.M. Glibert, K.J. Schukert, and M.P. Sanderson. 2000. Total dissolved nitrogen analysis Comparisons between the persulfate, UV and high temperature oxidation methods. Mar. Chem. 69 163-178. 

Comparison of conjugated and usual dehydrogenation results indicates the desirability of the oxidation method. Each consecutive reaction described by the chain non-branched scheme represents a combination of initiation, propagation and chain termination stages. 

Hatcher, P.G., Nanny, M.A., Minard, R.D., Dible, S.C., and Carson, D.M. (1995) Comparisons of two thermochemolytic methods for the analysis of lignin in decomposing wood The CuO oxidation method and the method of thermochemolysis with TMAH. Org. Geochem. 23, 881-888. 

Table 7.2.1. A comparison of the aminolysis and periodate oxidation methods in the determination of the phenolic hydroxyl content of Norway spruce and aspen wood meals (Lai et al. 1990)...

Here again the peracetic oxidation method was used to prepare comparison samples of diperoxides. Oxidation of 3-pentanone, for example, gave a 46% yield of 16. This method can also be used to prepare diperoxides such as 15. When equimolar amounts of acetone and 3-pentanone are oxidized by the peracetic acid method, diperoxide 15 is obtained along with 9 and 16. Similarly, oxidation of equimolar amounts of acetone and 2-butanone gave 9, 10, and 11. 

New Fe-Mo-Ti mixed oxides prepared via the sol-gel method comparison of the textural properties with solids obtained by impregnation... 

V7. Vestergaard, P., and Sayegh, J. F., Semi-automated assays for urinary 17-ketogenic steroids a comparison of bismuthate and periodate oxidation methods. Clin. Chim. Acta 14, 247-262 (1966). 

Fig. 6. Indirect comparison of depth-averaged TOC concentrations measured in the northwestern Atlantic with different oxidation methods (MacKinnon, 1978). A, Menzel (1970), persulfate oxidation a, MacKinnon (1978), dry oxidation A, Sharp (1973b), direct injection o, Skopintsev et al. (1966), dry oxidation , Gordon and Sutcliffe (1973), dry oxidation.

Fig. 9. Comparison of depth-averaged profiles of dissolved organic carbon (DOC) concentrations of samples from the Nova Scotian shelf measured with various oxidation methods. Data from Gershey et al. (1979). = persulfate oxidation (Menzel and Vaccaro, 1964) o = dry oxidation (MacKinnon, 1978) = photo-oxidation (Collins and Williams, 1977).

Comparison of oxidation methods used for analysis of organic matter in sea water (based on results of comparison by Gershey et al., 1979)... 

Noble metal-metal oxide dumbbell-shaped NPs have been synthesized based on seed-mediated growth. Metal oxides are grown over the pre-synthesized noble metal seeds by the thermal decomposition of the metal carbonyl followed by oxidation in air. They show enhanced catalytic activity towards CO oxidation in comparison with their counterparts [94]. Heterostructured Cu2S-ln2S3 with various shapes and compositions can be obtained by a high-temperature precursor-injection method wherein Cuj is used as the catalyst for the nucleation and growth of In Sj NPs [95]. 

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