Abstract
The Chapala Lake is one of the most polluted lakes in Mexico, due to the in flow of effluents from several industrial plants, the lake accumulates pollutants such as chromium(VI) which is considered important for aquatic ecosystem. This study aimed was to evaluate the ability to decrease the concentration of chromium (VI) by Lysinibacillus macroides 2(1B)104A, isolated from sediments of the Chapala Lake. The strain was identified through 16S rRNA sequencing and phylogenetic analysis. Results showed that this strain grows in concentrations of 50, 100, 200 and 300 mgL-1 Cr(VI), in pH ranging 6 to 7, showing 79.508% reduction in concentration 50 mgL-1, determining that the reduction occurs extracellularly. Likewise, it was observed that Lysinibacillus macroides reduced the concentration of Cr(IV) in the broth, it was not observed that the bacteria could sequester Cr(VI) in the membrane or intracellularly. However, it reduced the concentration of Cr(VI) in the broth. Lysinibacillus macroides 2(1B)104A isolate showed having the ability that decrease the concentration of Cr(VI), which makes it a viable options for bioremediation of water polluted with this metal.
Highlights
The Chapala Lake represents the final part of the Lerma-Chapala basin, located in the states of Jalisco and Michoacán, Mexico
Isolation and selection of the bacterial strain. twenty-six bacterial strains resistant heavy metals from sediments collected in Chapala Lake were isolated
Several studies have reported the presence of heavy metals in the Chapala Lake
Summary
The Chapala Lake represents the final part of the Lerma-Chapala basin, located in the states of Jalisco and Michoacán, Mexico This lake is an example of the disconnection between people who pollute upstream, and those who suffer the effects of pollution downstream of the basin, which flows into the Chapala Lake. The consequence of this water pollution is the generation of imbalances in ecosystems related to this Lake, affecting several human activities, such as: fishing, agriculture, ranching and recreative activities (Sandoval-Moreno & OchoaOcaña 2010). Solid and liquid wastes of chromium are released into surrounding areas and water
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