Behaviour of soil bacteria to nitrilotriacetate and nickel
2003
Galimska-Stypa, R. | Susek-Beska, S. (Uniwersytet Slaski, Katowice (Poland). Dept. of Microbiology)
The studies evaluated the impact of NTA on bacteria in nickel contaminated soil by determining changes in the number of free Ni sup(2+)sub(aq) ions under the influence of the chelator. It was found out that nickel toxicity in soil was usually reduced with addition of NTA, what was represented by a stimulation of the population growth of Gram negative bacteria and Pseudomonas, the strongest stimulation was observed at the Ni/NTA molar ratio of 1:4. NTA elevated the number of water-washable nickel ions in soil and considerably reduced the number of free, non-complexed nickel ions, which were detected only at the lowest dose of chelator, i.e. at the Ni/NTA molar ratio of 1:1. The amounts of Ni sup(2+)sub(aq) ions in this soil was aproximately 6 times lower compared to the soil containing only nickel, what meant a 10-fold increase in nickel ions, which were introduced into soil
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