Table 5.

Additional parameters to consider in future studies.

Parameters	Importance
CEC (meq kg−1)	Low levels reduce availability of soil nutrients, especially related to low OM
Salinity (dS/m)	Some remediation agents could increase salinity; probably not a factor in this study considering neutral—mildly alkaline conditions (high salinity is usually associated with high pH)
Microbial biomass/respiration (CFU g−1; mg CO2 h−1 kg−1)	Extreme pH, oxidizing conditions, and high surfactant concentrations may reduce microbial biomass, activity and important soil functions; this may not be a factor at this site considering the five year time span since remediation, humid tropical climate, and Fluvisol conditions (generally optimal for soil recovery)
Plant bioassay	This is a true confirmation of successful site remediation; a previous in situ study at this site with radish did not show reduced emergence, establishment or vigor, but bulb diameter was much less in the remediated soil; possibly due to soil compaction

Cation Exchange Capacity (CEC), Colony Forming Units (CFU).