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Chromium Resistant Bacteria : Impact on Plant Growth in Soil Microcosm

Sayel H., Joutey N. T., Ghachtouli N. E.

Archives of Environmental Protection

2014

Vol. 40, no. 2

81--89

Three chromium resistant bacterial strains, Pseudomonas fl uorescens PF28, Enterobacter amnigenus EA31 and Enterococcus gallinarum S34 isolated from tannery waste contaminated soil were used in this study. All strains could resist a high concentration of K2Cr2O7 that is up to 300 mg/L. The effect of these strains on clover plants (Trifolium campestre) in the presence of two chromium salts CrCl3 and K2Cr2O7 was studied in soil microcosm. Application of chromium salts adversely affected seed germination, root and shoot length. Bacterial inoculation improved the growth parameters under chromate stress when compared with non inoculated respective controls. There was observed more than 50% reduction of Cr(VI) in inoculated soil microcosms, as compared to the uninoculated soil under the same conditions. The results obtained in this study are signifi cant for the bioremediation of chromate pollution.

Studies on mechanism of 2-pyridinecarboxaldehyde oxidation by dichromates in strongly acidic aqueous solutions. The unusual reaction order on concentration of the aldehyde

Kita E., Kita P., Uścińska G.

Polish Journal of Chemistry

1998

Vol. 72, nr 8

1949-1957

2-Pyridinecarboxaldehyde (pyad) has been oxidized by Cr2O7(-2) ion at pH range 0-1 to 2-pyridinecarboxylic acid (pyac). The produced CR(III) exists in the form of three complex ions: [CR(pyac)(H2O)4](2+), [Cr(pyac)2(H2O)2](+) and [Cr(H2O)6](3+). The reaction follows unusual mixed fourth-order rate law: first-order on concentrations of H(+)-aq and CR(VI) and second-order on concentration of the aldehyde. Mechanism of the reaction has been discussed.