Abstract

CANAZA, Alejandro; POZO, Lizzette; FERRUFINO-GUARDIA, Erick  and  VARGAS, Virginia A.. Biosorption of lead(ii) ions by dead bacterial Biomass isolated from mine water. Rev. Bol. Quim [online]. 2021, vol.38, n.3, pp.119-125.  Epub Aug 31, 2021. ISSN 0250-5460.  https://doi.org/10.34098/2078-3949.38.3.3.

Lead and its different chemical forms have been widely used in industry over the past years and the result is the high pollution detected in water and soil environments. Lead (II) resistant microorganisms were isolated from liquid samples collected from Mina Asientos, Cochabamba-Bolivia. Eleven strains were isolated in solid media with 200 ppm Pb(II) and 4 strains were selected for metal removal in liquid samples. One strain presented the highest Pb(II) removal values for 250 ppm Pb(II). The selected strain designated as MA-4 was subjected to phylogenetic studies and showed 99.9 % sequence similarity with Pseudomonas monteilii. The biosorption follows Langmuir and Freundlich isotherm models, with qmax and Kf values of 166.67 and 11.09, respectively. These results implied a strong binding capacity to dead biomass and its potential application in biosorption process.

Keywords : Biosorption; Lead; Bacterial biomass.

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