Identification of oxidative coupling products of xylenols arising from laboratory-scale phytoremediation.

摘要: Abstract Oxidative coupling reactions take place during the passage of xylenols through a laboratory-scale helophyte-based constructed wetland system. Typical product groups including tetramethyl-[1,1′-biphenyl] diols and tetramethyl diphenylether monools as stable organic intermediates could be identified by combination pre-chromatographic derivatization GC/MS analysis. Structural assignment individual analytes was performed an increment system developed Zenkevich to pre-calculate retention sequences. The most abundant analyte turned out 3,3′,5,5′-tetramethyl-[1,1′-biphenyl]-4,4′-diol, which can formed radicals based on 2,6-xylenol or attack 2,6-xylenol-based radical 2,6-xylenol. Organic originating from oxidative also in anaerobic systems. This finding suggested presence (at least partly) oxic conditions rhizosphere.