pH affects mercury distribution, not methylation.
D055598:Chemical Phenomena; D002621:Chemistry; D006863:Hydrogen-Ion Concentration; D008628:Mercury; D008745:Methylation; D008767:Methylmercury Compounds; D012995:Solubility; D013997:Time Factors; D014873:Water Pollutants; D014874:Water Pollutants, Chemical
D008767:Methylmercury Compounds; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D008628:Mercury