Polarographische untersuchungen an phosphororganischen verbindungen

Sohr, H.; Löhs, Karlheinz

doi:10.1016/0022-0728(67)80099-8

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…The ability of surface active agents, such as trialkyl and triaryl phosphates, thiophosphates, phosphonates, and phosphine oxides, to inhibit electron transfer in the reduction of Cu and Cd was reported (1208)(1209)(1210)(1211).…”

Section: Organic Halogenmentioning

confidence: 99%

Organic polarography

Pietrzyk¹

1968

Anal. Chem.

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Section: Organic Halogenmentioning

confidence: 99%

Organic polarography

Pietrzyk¹

1968

Anal. Chem.

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“…This situation requires C-P bond cleavage probably after an initial formation of a radical anion. The aroyl radical must couple rapidly at the electrode surface (6)(7)(8)(9). A few electrochemical studies which describe the development of polarographic methods for analyses of such compounds as Malathion [S-(l,2-dicarbethoxyethyl) 0,O-dimethyl dithiophosphate] and Parathion (0,O-diethyl 0-p-nitrophenyl thiophosphate) have also been reported (10)(11)(12)(13).…”

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confidence: 99%

Low-resolution mass spectrometric determination of aromatic fractions from petroleum

Robinson¹,

Cook²

1969

Anal. Chem.

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difficulty in that the matrix containing the rate constants is not a symmetric matrix. It is, however, a "banded" matrixi.e., one in which all elements are zero except those on the main diagonal and the two diagonals adjacent to it. It can be shown that the eigenvalues (but not the eigenfunctions) of this matrix are the same as those of a symmetric matrix with the same main diagonal elements, but off-diagonal elements lii = The eigenvalues are therefore obtained by solving this symmetric matrix and the coefficients are calculated by solving the five simultaneous linear equations with five unknowns.A mass spectrometric procedure far determining up to 21 compound types in petroleum aromatic fractions is described. The entire composition of any sample is accounted for in terms of 12 hydrocarbon types, 3 thiopheno types, and 6 unidentified groups. Inclusion of the unidentified components avoids the difficulties encountered in earlier methods which described composition in terms of a fixed number of named types. Reasonable results have been obtained for a wide variety of samples. MASSSPECTROMETRIC methods for determining compound types in petroleum have been used routinely for more than 15 years. Since the first application to the analysis of gasolines ( I ) , such methods have been extended to the heaviest volatile fractions of petroleum. However, a method to determine compound types in the wide variety of heavy aromatic fractions encountered in the petroleum industry has not been reported. The absence of such a procedure undoubtedly reflects the uncertain knowledge of the composition of petroleum aromatics and also reflects the complexity of the problem of obtaining adequate group type analyses. Hastings et al. (2) determined 12 compound types, including three thiopheno types, by using summations of the most intense (M-I)+ peaks for each type. (If a series of molecular ions are designated (M)+ the series of ions at each of the next lower masses may be expressed as (M-l>+.) When applied to very light or very heavy fractions, the results are difficult to interpret. Orkin et al. (3) used monoisotopic peaks to determine seven compound types. Summations over a limited mass range contain both (M)+ and (M-l)+ peaks, and equal sensitivities are assumed for each type. No sulfur types are included. This forces a large number of compound types into the seven groups and fails to further resolve the types. Gallegos et al. (4) developed a high resolution mass (1) R. A. Brown, ANAL. CHEM., 23,430(1951).

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“…published concerning polarographic studies of hydroxyalkylphosphines (7), phosphonium salts (2), and other compounds such as triphenylphosphine (3), 0,0-dimethyl 2,2,2trichloro-1 -hydroxyethylphosphonate (4), and various nitrophenyl phosphates (5). A series of papers has been released concerning the polarographic behavior of various metal ions and complex ions in the presence of certain organophosphorus compounds (6)(7)(8)(9). A few electrochemical studies which describe the development of polarographic methods for analyses of such compounds as Malathion [S-(l ,2-dicarbethoxyethyl) , -dimethyl dithiophosphate] and Parathion ( , -diethyl 0-/>nitrophenyl thiophosphate) have also been reported (10)(11)(12)(13).…”

mentioning

confidence: 99%