Abstract: Remediation of m-chloronitrobenzene(MCNB)-or m-nitrotoluene(MNT)-contaminated soils with zero-valent iron(ZVI)at ambient temperature and pressure was studied.Results show that ZVI efficiently reduced MCNB and MNT in soils into their respective anilines,without triggering any further dechlorination reaction or further demethylase reaction.The efficiency of reduction was significantly affected by reaction time,soil moisture content,initial soil pH,ZVI dosage and reaction temperature.When in the soil the concentration of the two pollutants were about 2.5×10^-6 mol·g-1,the moisture content 0.75 mL·g^-1,the initial pH 6.8 and the application rate of ZVI 25 mg·g^-1 soil,incubation at temperature(25±1)℃ for 5 hours,over 80% of both pollutants were reduced.Laboratory data also show that a longer reaction time,a lower acidity,a higher dosage of ZVI and a relatively higher temperature of reaction as well as a saturated moisture content may significantly increase the reduction rate.

Key words: m-chloronitrobenzene(MCNB), m-nitrotoluene(MNT), zero-valent iron(ZVI), soil, reduction