Photodegradation of the surfactants na-dodecylbenzenesulfonate and dodecylpyridinium-chloride as affected by humic substances

Hermann, Reinhold; Gerke, Jörg; Ziechmann, W.

doi:10.1007/bf02128649

Cited by 10 publications

(8 citation statements)

References 17 publications

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“…Obviously, the UV pretreatment did not destroy all of the soil organic matter that was not BC. Humic substances are relatively resistant to UV irradiation [56][57][58][59]. Consequently, part of the humic substances survive the irradiation and are determined as BC.…”

Section: Black Carbon In Soilmentioning

confidence: 99%

“…With the aid of catalysts such as Fe(III)-Fe(II), Mn(IV)-Mn(III)-Mn(II), or soil oxidoreductases such as polyphenoloxidases, brown to dark brown polymers are synthesized, also incorporating amino acids, amino sugars, sugars [6], probably black carbon, and a variety of organic xenobiotics, e.g., triazines (Senesi et al [65]; Müller-Wegener [66,67]), or surfactants [58,68].…”

Section: Humic Substances In Soils: a Reformulated Viewmentioning

confidence: 99%

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Concepts and Misconceptions of Humic Substances as the Stable Part of Soil Organic Matter: A Review

Gerke¹

2018

Agronomy

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127

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In the last three decades, the concept of soil humic substances has been questioned in two main directions. Misinterpretations of CP MAS 13 C NMR spectroscopy led to the conclusion that soil organic matter is mainly aliphatic, questioning the theory of polymerization of humic substances from phenolic molecules. Conversely, some critics of humic substances assume that a great proportion of aromatic soil organic carbon originates from fire-affected carbon, often termed as black carbon (BC). However, the determination of BC in soil by two widely applied methods, the benzene polycarboxylic acid marker method and the UV method, is not reliable and seems to strongly overestimate the BC content of soils. The concept of humic substances continues to be relevant today. The polymerization of phenolic molecules that originate from the degradation of lignin or synthesis by microorganisms may lead to humic substances which can incorporate a variety of organic and inorganic molecules and elements. The incorporation, e.g., of triazines or surfactants into the humic matrix, leading to bound residues, illustrates that humic substances are important to explain central reactions in soil. Humic substances are also important to understand the availability of plant nutrients in soil, including P, Fe, and Cu, and they may have a direct effect on the growth of higher plants in soil. Therefore, there are good reasons to reformulate or to further develop the concepts and models of humic substances introduced and developed by M.

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Section: Black Carbon In Soilmentioning

confidence: 99%

Section: Humic Substances In Soils: a Reformulated Viewmentioning

confidence: 99%

Concepts and Misconceptions of Humic Substances as the Stable Part of Soil Organic Matter: A Review

Gerke¹

2018

Agronomy

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127

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“…Therefore, in this study, without adequate interaction between LAS and bacteria in the biofilms, the biodegradation of LAS was minor in a 36-h period. As to photolysis, studies were usually carried out under UV illumination in the presence of oxidants, such as H 2 O 2 and O 3 [14,17,19,36,37], and/or photocatalysts such as TiO 2 and ZnO [37,41,42], and/or photosensitizer such as dyes and humic substances [42,43], and the degradation was usually fairly quick. However, the photolysis of LAS in pure water under illumination of visible light could hardly be observed [19,42], and the photolysis in sterilized natural water was also found to be relatively slow (t 1/2 = 6-14 d) [19].…”

Section: Discussionmentioning

confidence: 99%

The degradation of linear alkylbenzene sulfonate (LAS) in the presence of light and natural biofilms: The important role of photosynthesis

Xia¹,

Li²,

Su³

et al. 2012

Journal of Hazardous Materials

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“…The UV/NMR method after Skjemstad et al [19] also overestimates BC which may explain the extremely high BC values for this method in the comparative study to Schmidt et al [17]. This may be due to only partial destruction of non-BC carbon in soil, mainly humic substances which were shown to be resistant to UV irradiation (e.g., [30] and references therein). Novotny et al [10] formulated the same argument on the rejection of the UV/NMR method for the determination of soil BC as follows: "Removal … of non-pyrogenic C depends on the oxidation intensity which is overall lowest in the case of photooxidation….…”

Section: Simpson and Hatchermentioning

confidence: 92%

Black (pyrogenic) carbon in soils and waters: a fragile data basis extensively interpreted

Gerke

2019

Chem. Biol. Technol. Agric.

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Black (pyrogenic) carbon (BC) has its origin in incomplete combustion of organic matter. It is considered to be a stable fraction of soil organic carbon (SOC) accounting for a great proportion of SOC in many soils. The aim of this article is to verify the reliability of the three most widely applied methods to determine BC in soils: the benzene polycarboxylic acid (BPCA) method, the UV/NMR method and the 13 CNMR method. All these methods strongly overestimate BC in soil and dissolved BC in waters. The main reason for the overestimation can be attributed to the fact that these three methods measure the polycyclic aromatic carbon (PAC) present in BC. However, PAC structures are also a component of humic substances so that a part of humic C is measured as BC. It can be concluded that the importance of BC in soil and waters is strongly overestimated and should be critically reevaluated.

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Photodegradation of the surfactants na-dodecylbenzenesulfonate and dodecylpyridinium-chloride as affected by humic substances

Cited by 10 publications

References 17 publications

Concepts and Misconceptions of Humic Substances as the Stable Part of Soil Organic Matter: A Review

Concepts and Misconceptions of Humic Substances as the Stable Part of Soil Organic Matter: A Review

The degradation of linear alkylbenzene sulfonate (LAS) in the presence of light and natural biofilms: The important role of photosynthesis

Black (pyrogenic) carbon in soils and waters: a fragile data basis extensively interpreted

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