TPH (lubricant and diesel)-contaminated soils were collected for
laboratory microcosm studies. Soil analyses included the following:
TPH concentrations, pH, organic and moisture contents, nutrient
concentrations, cation exchange capacity (CEC), and total (cultivable)
heterotrophs, electric conductivity (EC). Analyses were performed
using methods described in Standard Methods (APHA,
2011). The soil formation was mainly silty loam and the soil characteristics
were as follows: pH ¼ 7; ORP ¼ 245 mv; organic matter
content ¼ 1.01%; CEC ¼ 1.02 meq/100 g; total nitrogen ¼ 0.53 g/kg;
total phosphorus ¼ 0.12 mg/kg; total heterotrophs ¼ 3.5 103 CFU/
g.