2,4,4-trichloro-2’-hydroxymethyl-diphenylether; formula: C13H9Cl3O2; CAS Registry Number: 4640-01-1
Structure of Methyl-triclosan
Source: Wikimedia

Product of methylation of triclosan

Methyl-triclosan is a transformation product of the biocide triclosan. Triclosan is widely used, for instance in disinfectants, soaps, and deodorants, as preservative in cosmetic products and as antibacterial treatment of textiles.

Methylation of triclosan in sewage treatment plants (STP) may result in the formation of methyl-triclosan which partly enters surface waters via the STP-effluents. Methyl-triclosan is assessed as persistent in the environment and toxic to aquatic organisms. Because of its lipophilicy it can accumulate in organisms.


Bream Bioindicator in rivers and lakes
Suspended particulate matter Fine insoluble mineral or organic particles in the water phase

Sampling area

Saarländischer Verdichtungsraum Important, old-industrialised conurbation in Germany.
Bornhöveder Seengebiet Main water divide between the North- and Baltic Sea
Rhein Longest river in Germany
Elbe Fourth largest river basin in Central Europe
Verdichtungsraum Halle-Leipzig Region in the chemical triangle of Central Germany
Donau Second largest river in Europe

Sampling period

1994 - 2012

Extended information