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Kinetics of atrazine, deisopropylatrazine, and deethylatrazine soil biodecomposers
Twenty-two experimental sets were used to determine the biodecomposition parameters of atrazine (ATZ), deisopropylatrazine (DIATZ), and deethylatrazine (DEATZ) by inverse solution of Michaelis-Menten-Monod kinetic equations. The averaged maximum specific growth rate ([mu]), Michaelis-Menten half-saturation concentration (K), and biomass yield (Y) ranged between 2.00 x 10.sup.-7 and 4.62 x 10.sup.-5 1/s, 3.43 x 10.sup.-6 and 1.39 x 10.sup.1 mol/L, and 1.20 x 10.sup.2 and 2.98 x 10.sup.5 mg-wet-Bio/mol-Subs, respectively. Parameters grouped by reaction pathway appeared clustered by aerobic and anaerobic catabolic breakdown, and were poorly correlated between each other (R ranging from -0.27 to 0.63, p [greater than or equal to] 0.05). The tested bacterial strains decomposed ATZ, DIATZ, and DEATZ relatively rapidly in laboratory conditions, with an half-life (t.sub.1/2) ranging between 3 and 6 days. Numerical modeling showed that ATZ, DIATZ, and DEATZ half-lives were particularly sensitive to their initial concentration and the initial microbial biomass concentration. This study suggests that these bacterial strains can effectively be used or enhanced for bioremediation of agricultural soils where atrazine has been applied as long as these bacteria already coexist in or can integrate with the local soil microbial population at a given location.
Kinetics of atrazine, deisopropylatrazine, and deethylatrazine soil biodecomposers
Twenty-two experimental sets were used to determine the biodecomposition parameters of atrazine (ATZ), deisopropylatrazine (DIATZ), and deethylatrazine (DEATZ) by inverse solution of Michaelis-Menten-Monod kinetic equations. The averaged maximum specific growth rate ([mu]), Michaelis-Menten half-saturation concentration (K), and biomass yield (Y) ranged between 2.00 x 10.sup.-7 and 4.62 x 10.sup.-5 1/s, 3.43 x 10.sup.-6 and 1.39 x 10.sup.1 mol/L, and 1.20 x 10.sup.2 and 2.98 x 10.sup.5 mg-wet-Bio/mol-Subs, respectively. Parameters grouped by reaction pathway appeared clustered by aerobic and anaerobic catabolic breakdown, and were poorly correlated between each other (R ranging from -0.27 to 0.63, p [greater than or equal to] 0.05). The tested bacterial strains decomposed ATZ, DIATZ, and DEATZ relatively rapidly in laboratory conditions, with an half-life (t.sub.1/2) ranging between 3 and 6 days. Numerical modeling showed that ATZ, DIATZ, and DEATZ half-lives were particularly sensitive to their initial concentration and the initial microbial biomass concentration. This study suggests that these bacterial strains can effectively be used or enhanced for bioremediation of agricultural soils where atrazine has been applied as long as these bacteria already coexist in or can integrate with the local soil microbial population at a given location.
Kinetics of atrazine, deisopropylatrazine, and deethylatrazine soil biodecomposers
la Cecilia, Daniele (author) / Maggi, Federico
2016
Article (Journal)
English
BKL:
43.00
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