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Alkylbenzene

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Karl Wuhrmann – One of the best experts on this subject based on the ideXlab platform.

  • The influence of the sulphonic group on the biodegradability of n-Alkylbenzene sulphonates.
    Xenobiotica, 2008
    Co-Authors: H. Leidner, Rolf Gloor, D. Wüest, Karl Wuhrmann

    Abstract:

    1. Model compounds of the type β-n-Alkylbenzene sulphonates, β-n-alkylbenzoic acids and phenylcarboxylic acids were tested for biodegradability. Bioassays were performed with unadapted mixed cultures (soil suspensions) using the Organization for Economic Cooperation and Development (OECD) screening test.2. Degradation was measured by dissolved organic carbon analysis and g.l.c. or h.p.l.c.3. β-n-Alkylbenzene sulphonates were resistant to microbial attack. The carboxylated compounds with analogous structures, however, with one exception, were easily decomposed.4. The results indicate that the persistent character of β-n-Alkylbenzene sulphonates is mainly due to the sulphonic substituent.

  • The influence of the sulphonic group on the biodegradability of n-Alkylbenzene sulphonates.
    Xenobiotica, 2008
    Co-Authors: H. Leidner, Rolf Gloor, D. Wüest, Karl Wuhrmann

    Abstract:

    1. Model compounds of the type β-n-Alkylbenzene sulphonates, β-n-alkylbenzoic acids and phenylcarboxylic acids were tested for biodegradability. Bioassays were performed with unadapted mixed cultures (soil suspensions) using the Organization for Economic Cooperation and Development (OECD) screening test.2. Degradation was measured by dissolved organic carbon analysis and g.l.c. or h.p.l.c.3. β-n-Alkylbenzene sulphonates were resistant to microbial attack. The carboxylated compounds with analogous structures, however, with one exception, were easily decomposed.4. The results indicate that the persistent character of β-n-Alkylbenzene sulphonates is mainly due to the sulphonic substituent.

H. Leidner – One of the best experts on this subject based on the ideXlab platform.

  • The influence of the sulphonic group on the biodegradability of n-Alkylbenzene sulphonates.
    Xenobiotica, 2008
    Co-Authors: H. Leidner, Rolf Gloor, D. Wüest, Karl Wuhrmann

    Abstract:

    1. Model compounds of the type β-n-Alkylbenzene sulphonates, β-n-alkylbenzoic acids and phenylcarboxylic acids were tested for biodegradability. Bioassays were performed with unadapted mixed cultures (soil suspensions) using the Organization for Economic Cooperation and Development (OECD) screening test.2. Degradation was measured by dissolved organic carbon analysis and g.l.c. or h.p.l.c.3. β-n-Alkylbenzene sulphonates were resistant to microbial attack. The carboxylated compounds with analogous structures, however, with one exception, were easily decomposed.4. The results indicate that the persistent character of β-n-Alkylbenzene sulphonates is mainly due to the sulphonic substituent.

  • The influence of the sulphonic group on the biodegradability of n-Alkylbenzene sulphonates.
    Xenobiotica, 2008
    Co-Authors: H. Leidner, Rolf Gloor, D. Wüest, Karl Wuhrmann

    Abstract:

    1. Model compounds of the type β-n-Alkylbenzene sulphonates, β-n-alkylbenzoic acids and phenylcarboxylic acids were tested for biodegradability. Bioassays were performed with unadapted mixed cultures (soil suspensions) using the Organization for Economic Cooperation and Development (OECD) screening test.2. Degradation was measured by dissolved organic carbon analysis and g.l.c. or h.p.l.c.3. β-n-Alkylbenzene sulphonates were resistant to microbial attack. The carboxylated compounds with analogous structures, however, with one exception, were easily decomposed.4. The results indicate that the persistent character of β-n-Alkylbenzene sulphonates is mainly due to the sulphonic substituent.

Shuichang Zhang – One of the best experts on this subject based on the ideXlab platform.

  • geochemistry of Alkylbenzenes in the paleozoic oils from the tarim basin nw china
    Organic Geochemistry, 2014
    Co-Authors: Shuichang Zhang, Haiping Huang, Jin Su, Haifeng Zhang

    Abstract:

    a b s t r a c t Monoaromatic hydrocarbons (Alkylbenzenes) in Paleozoic oils/condensates from the Tarim Basin were quantitatively analyzed using gas chromatography–mass spectrometry. Their relative abundances and distributions show large variation, which are most likely controlled by the temperature and duration of the catagenesis stage of petroleum maturation. Relatively high abundance of long chain linear substituted Alkylbenzenes and alkyltoluenes in the studied samples implies that source rocks of these oils/ condensates contain high contents of algal material. The dominance of dodecylbenzene in these n-Alkylbenzenes suggests the formation of Alkylbenzenes from fatty acids via lactone formation (dehydration). The 1,2,3,4-tetramethylbenzene (TeMB), 1-methyl-3-phytanylbenzene (1-M-3-PyB) and aryl isoprenoids are mainly derived from carotenoids produced by Chlorobiaceae and their occurrence may indicate a highly reducing depositional environment. However, the concentration of these compounds diminishes significantly at high maturity. With increasing thermal maturity, the prominent trend of demethylation of Alkylbenzenes is accompanied by shortening of alkyl side chains. Large variation in the C4-Alkylbenzene isomer distribution is also controlled by thermal maturity. The 1,2,3,5-TeMB and 1,2,4,5-TeMB isomers are more stable than other TeMB isomers and the overall thermodynamic stability of TeMBs is lower than that of dimethylethylbenzenes. Therefore, several maturity parameters can be derived based on Alkylbenzene stability. Absolute concentrations of Alkylbenzenes generally increase with increasing thermal maturity, but concentrations of 1-M-3-PyB and aryl isoprenoids decrease significantly at high maturity. Maturity parameters obtained from Alkylbenzenes are especially useful for highly mature oils and condensates when most biomarkers are depleted. Caution is advised when interpreting the paleoenvironment and thermal maturity of an oil from the Alkylbenzene signatures because they are affected by various other processes such as evaporative fractionation, thermal cracking and biodegradation as well.