Dpto. de Química Física, Facultad de Ciencias del Mar, Universidad de Cádiz, Campus Río San Pedro s/n, 11510, Puerto Real, Cádiz, Spain.
Environ Monit Assess. 2010 Mar;162(1-4):417-25. doi: 10.1007/s10661-009-0806-z. Epub 2009 Feb 24.
Aerobic biodegradation of linear alkylbenzene sulfonates (LAS) and sulfophenylcarboxylic acids (SPCs) in water, at different salinity values, has been studied. Three experiments have been carried out employing a staircase model system with continuous dosage of LAS to the system and using concentrations of LAS of the same order as those detected in littoral waters receiving urban wastewater discharges. LAS biodegradation was observed to be almost complete (showing a great extent), and in all cases exceeds 98.4%. At the very low concentration values of LAS utilized in the experiments, no significant variations in the biodegradation of LAS due to the effect of the different salinity values assayed were observed. The biodegradation intermediates detected for all the cases were sulfophenylcarboxylic acids with carboxylic chains of between five and 13 carbon atoms. The detection of C13-SPC (which is only produced by C13-LAS) confirms the existence of omega-oxidation. The total disappearance of SPCs in all cases indicates that mineralization of LAS at the concentrations tested was complete.
研究了在不同盐度值下，水中直链烷基苯磺酸盐（LAS）和磺基苯羧酸（SPC）的好氧生物降解情况。采用连续投加 LAS 的阶梯模型系统进行了三项实验，LAS 的浓度与接受城市污水排放的近岸水域中检测到的浓度相同。LAS 的生物降解几乎完全（显示出很大程度），在所有情况下均超过 98.4%。在实验中使用的 LAS 的非常低浓度值下，由于测定的不同盐度值的影响，LAS 的生物降解没有观察到明显的变化。对于所有情况，检测到的生物降解中间体均为磺基苯羧酸，其羧酸链长为 5 至 13 个碳原子。C13-SPC 的检测（仅由 C13-LAS 产生）证实了 ω-氧化的存在。在所有情况下 SPC 的完全消失表明，在所测试的浓度下 LAS 的矿化是完全的。
