Chromium (VI) removal by a chromate-resistant strain of Aspergillus Niger [Remoción de cromo (VI) por una cepa de Aspergillus Niger resistente a cromato]
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The objective of this work was to analyze the capability a fungal strain of Aspergillus Niger to reduce chromium (VI), using the colorimetric method of diphelylcarbazide. When the strain was incubated in minimal medium with glucose and other inexpensive commercial carbon sources such as unrefined sugar or glycerol, in presence of 50 mg/L of Cr (VI), the strain completely removed Cr (VI). Also, Cr (III) was produced in the growth medium after 6 days of incubation, at 28°C, pH of 5.3 and 6.2, agitation speed of 100 rpm and an inoculum of 8.3 mg of dry weight. These results indicate that the fungal strain of Aspergillus Niger has the capacity of reducing Cr (VI) to Cr (III), and therefore it can be used in for reducing Cr (VI) pollution.