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首页> 外文期刊>Environmental toxicology and chemistry >LINEAR ALKYLBENZENESULFONATE (LAS) SURFACTANTS IN A SIMPLE TEST TO DETECT REFRACTORY ORGANIC CARBON (ROC): ATTRIBUTION OF RECALCITRANTS TO IMPURITIES IN LAS
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LINEAR ALKYLBENZENESULFONATE (LAS) SURFACTANTS IN A SIMPLE TEST TO DETECT REFRACTORY ORGANIC CARBON (ROC): ATTRIBUTION OF RECALCITRANTS TO IMPURITIES IN LAS

机译：线性烷基苯磺酸盐（LAS）表面活性剂的简单检测方法，用于检测耐火有机碳（ROC）：归因于LAS中杂质的归因

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The standard procedure to examine the biodegradability of a (group of) compound(s) in a trickling filter is a continuous-flow system. In this test, nondegraded metabolites from a commercial linear alkylbenzenesulfonate (LAS) surfactant are detected (Koelbener, Baumann, Leisinger, and Cook; accompanying paper). This procedure has now been augmented by two phases in closed cycle to give a test for refractory organic carbon (ROC test). First, the concentration of nondegraded metabolites was increased by readdition of LAS to the solution being cycled through the filter. Second, the concentrated residues were further recycled till the net dissolved organic carbon (DOC) stabilised at a finite value and the net released CO_2 stabilised at about zero. The organic compounds remaining at this phase of the experiment were considered recalcitrant and could be examined by global (e.g., DOC) and specific (e.g., HPLC) assays. Four different commercial preparations of LAS were examined, as were the (4-sulfophenyi)undecane homologue (C_(11)-LAS), the (4-sulfophenyl)dodecane homologue (C_(12)-LAS), and some related compounds. The four commercial LAS preparations contained different levels of impurities (2% to about 17%, according to the producers), which were largely dialkyltetralinesulfonates (DATS) and branched-chain alkylbenzenesulfonates (bABS). The refractory organic carbon (ROC) remaining after biodegradation varied from 3 to 14%. The results were a characteristic of the LAS under study and were independent of the source of the biomass used in the experiment. Residues were examined by HPLC, and 50 to 100 peaks were observed, which were usually characteristic of the LAS studied. No peak has been conclusively identified. We consider the recalcitrants to represent carboxylated DATS and carboxylated bABS.
机译：检查滴滤池中（一种或多种）化合物的生物降解性的标准程序是连续流系统。在该测试中，检测到了来自商用线性烷基苯磺酸盐（LAS）表面活性剂的未降解代谢物（Koelbener，Baumann，Leisinger和Cook；随附论文）。现在，该程序在封闭循环中增加了两个阶段，以进行难熔有机碳测试（ROC测试）。首先，通过将LAS重新分配到循环通过过滤器的溶液中来增加未降解代谢物的浓度。第二，将浓缩的残余物进一步循环利用，直到净溶解有机碳（DOC）稳定在有限值，净释放的CO_2稳定在大约零为止。在此实验阶段剩余的有机化合物被认为是顽强的，可以通过整体（例如DOC）和特定（例如HPLC）分析进行检查。研究了LAS的四种不同的商业制剂，包括（4-磺基苯乙）十一烷同系物（C_（11）-LAS），（4-磺基苯基）十二烷同系物（C_（12）-LAS）和一些相关化合物。四种商业化的LAS制剂含有不同含量的杂质（根据生产商的说法，为2％至约17％），其中大部分为二烷基四甲苯磺酸盐（DATS）和支链烷基苯磺酸盐（bABS）。生物降解后残留的难熔有机碳（ROC）从3％到14％不等。结果是所研究的LAS的特征，并且与实验中使用的生物质来源无关。通过HPLC检查残留物，并观察到50至100个峰，这通常是所研究的LAS的特征。没有确定的峰。我们认为顽固剂代表羧化DATS和羧化bABS。

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