Environmental Transformation of Alkylated and Inorganic Forms of Certain Metals

Effects of nickel and lead and a support material on the methanogenesis from sewage sludge

“…The higher negative influence of the heavy metals tested on the methanogenesis from loading sludge, compared to sludge from anaerobic digester, can be due to the different microbial composition of both sludges or to a higher acclimatization degree of the micro-organisms in the anaerobic digester for some heavy metals (Ahring and Westermann 1983 ;Capone et al 1983 ;Parkin et al 1983). This acclimatization of the micro-organisms may reflect a variety of processes, such as enzyme induction, development of tolerance, changes in the microbial metabolism, to name a few (Saxena and Howard 1977;Gadd and Griffiths 1978).…”

Sediment-associated contaminants ? an overview of scientific bases for developing remedial options

“…Changes in redox potential have a greater effect on the mobility of toxic metals than on changes of pH during dredging (Weber et al, 1982), while the opposite is true for land disposal of dredged materials (Gambrell et al, 1977). Biological factors in respect to dredging operations include species transformations of toxic metals by methylation (Saxena & Howard, 1977), biodegradation of PCBs (Clark et al, 1979), and a wide range of processes affecting bioconcentration of contaminants, either by direct exchange of chemicals from suspended particulates to gill or tissue surfaces or by stripping of chemicals from particulates as they pass through digestive tracts (Allan 1984). There are many indications that dredging has immediate, but no long-term effect on benthic organisms (Sweeney et al, 1975).…”

Organometallic Compounds in the Environment

“…Microorganisms can transform many inorganic and organometallic com pounds (3)(4)(5)(6)(7). Microorganisms can transform many inorganic and organometallic com pounds (3)(4)(5)(6)(7).…”