Microcalorimetry and enzyme activity to determine the effect of nickel and sodium butyl xanthate on soil microbial community.In non-ferrous metal tailings, combined pollution in the surrounding soil is caused by heavy metals and flotation chemicals.  The combined effects of nickel (Ni) and its primary ore processing collector, sodium butyl xanthate (SBX), on soil microbial activity were investigated following the fluorescein diacetate hydrolase (FDA) and sucrase (SA) activities, and isothermal microcalorimetry during 60 days.  Thus, microcalorimetry was a useful method to characterize soil microbial communities.
Microcalorimetry
The combined effects of nickel (Ni) and its primary ore processing collector, sodium butyl xanthate (SBX), on soil microbial activity were investigated following the fluorescein diacetate hydrolase (FDA) and sucrase (SA) activities, and isothermal microcalorimetry during 60 days. 
fluorescein diacetate hydrolase (FDA)
The combined effects of nickel (Ni) and its primary ore processing collector, sodium butyl xanthate (SBX), on soil microbial activity were investigated following the fluorescein diacetate hydrolase (FDA) and sucrase (SA) activities, and isothermal microcalorimetry during 60 days. 
sucrase (SA)