“…Heavy metals have been introduced to soil through agricultural management, such as the addition of composts (Sharifi & Renella, 2015), fertilizers (Chen et al, 2014) and pesticides (Morgan, 2013), industrial activities (Gottesfeld et al, 2018;Khaledian, Pereira, Brevik, Pundyte & Paliulis, 2017), mining (Mbila & Thompson, 2004), poorly regulated or illegal recycling of electronic wastes or e-wastes (Wu et al, 2015) and the construction of structures using treated timber or lumber (Gardner, Weindorf & Flynn, 2013). The petroleum industry can negatively affect soil near oil or water production and spill sites or near waste disposal locations with a wide range of organic chemicals, heavy metals (Laffon, Pásaro & Valdiglesias, 2016), salts (Lauer, Harkness & Vengosh, 2016) and naturally occurring radioactive materials (NORM) (Zielinski & Otton, 1999). Organic chemicals have been added to soil through agricultural and industrial activities and waste disposal, including the discarding of pharmaceutical wastes (Burgess, 2013).…”