Abstract
Chromium (Cr) in the trivalent form (Cr III) is an important component of a balanced human and animal diet and its deficiency causes disturbance to the glucose and lipid metabolism in humans and animals. In contrast, hexavalent Cr (Cr VI) is a highly toxic carcinogen and may cause death to animals and humans if ingested in large doses. Recently, concern about Cr as an environmental pollutant has been escalating due to its build up to toxic levels in the environment as a result of various industrial and agricultural activities. In the present study, the hexavalent chromium was reduced into trivalent chromium from chromium contaminated (300 μg g) soil. In the presence of organic amendments (poultry manure) and microbial inoculants (Pseudomonas fluorescens and Trichoderma viride) the chromium (VI) reduction was observed in maximum in the poultry manure treatment (91%) whereas poultry manure with Pseudomonas fluorescens reduced the hexavalent chromium up to 90 %.
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