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首页> 外文期刊>Environmental Science & Technology >Monitoring the Primary Biodegradation of Linear Alkylbenzene Sulfonates and Their Coproducts in Anoxic Sediments Using Liquid Chromatogranhy-Mass Spectrometry
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Monitoring the Primary Biodegradation of Linear Alkylbenzene Sulfonates and Their Coproducts in Anoxic Sediments Using Liquid Chromatogranhy-Mass Spectrometry

机译：使用液相色谱-质谱法监测缺氧沉积物中线性烷基苯磺酸盐及其副产物的主要生物降解

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An accompanying article has demonstrated the anaerobic degradation of the surfactant linear alkylbenzene sulfonate (LAS) in microcosms filled with marine sediments through the generation of sulfophenylcarboxylic acids (SPCs). A detailed study shows that this process was uniform in the blanks (non-spiked natural sediments) for every LAS homologue during the complete course of the experiment. However, when sediments were spiked with commercial LAS and, therefore, enriched with short-chain homologues, degradation was enhanced for these homologues until their percentages were close to those for non-spiked sediments. The reason is that short-chain homologues are more bioavailable due to their higher solubility and lower sorption capacity. Thus, sorption on sediments was found to be increased with the length of the alkyl chain for LAS homologues, following a linear Freundlich isotherm, whereas the metabolites generated were predominant in solution due to their much higher polarity. Intermediate-chain SPC homologues (C_7-C_9 SPCs) were the most abundant during the experiment, but a significant increase in the concentration of shorter-chain SPC homologues (C_4-C_6 SPCs) was detected toward the end. In the case of isomers, the steric effect of the aromatic group implies that LAS primary degradation took place preferentially over external isomers. Therefore, the generation of external isomers of SPCs was predominant during the complete experiment although internal isomers of SPCs became more evident when the degradation process had advanced and external isomers of LAS became scarce. The identity of both types of SPC isomer was confirmed by tandem mass spectrometry. With respect to LAS coproducts, the relative percentage of iso-LAS increased during the complete experiment and removal percentages for dialkyl tetralinsulfonates ( < 30%) were typically lowerthatthose for LAS (66-79%), although a similar behavior was observed for their homologues in both cases.
机译：随附的文章已证明，通过生成磺基苯基羧酸（SPC），在充满海洋沉积物的微观世界中，表面活性剂线性烷基苯磺酸盐（LAS）的厌氧降解。详尽的研究表明，在整个实验过程中，每个LAS同源物的空白（未加标的自然沉积物）的过程都是一致的。但是，当沉积物掺有商品化LAS并因此富含短链同系物时，这些同系物的降解会加剧，直到其百分率接近未掺入沉积物的百分率为止。原因是短链同源物由于其较高的溶解度和较低的吸附能力而具有更高的生物利用度。因此，发现在线性的弗氏等温线之后，对于LAS同系物，沉积物上的吸附随着烷基链的长度而增加，而由于其极性更高，所生成的代谢产物在溶液中占主导地位。在实验过程中，中链SPC同源物（C_7-C_9 SPC）最丰富，但是到最后，短链SPC同源物（C_4-C_6 SPC）的浓度显着增加。在异构体的情况下，芳族基团的空间效应表明LAS一级降解优先于外部异构体发生。因此，在整个实验过程中，SPC的外部异构体的生成占主导地位，尽管当降解过程已经进行且LAS的外部异构体稀缺时，SPC的内部异构体变得更加明显。通过串联质谱法证实了两种类型的SPC异构体的身份。关于LAS副产物，在整个实验过程中iso-LAS的相对百分比增加，四烷基磺酸二烷基酯的清除百分比（<30％）通常比LAS的低（66-79％），尽管它们的同系物观察到相似的行为。在两种情况下。

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