“Caracterización fisicoquímica y bacteriológica de las aguas de la laguna de Ozogoche de la zona central del Ecuador”.

Abstract

Laguna de Ozogoche forms part of the grand sistema lacustre ecuatoriano which pertain to the Zona Central del Ecuador. It is situated in the Provincia de Chimborazo, Cantón Alausí within the southwest region of the Parque Nacional Sangay and it is under the protection of the Ministerio del Ambiente; the entity that extended the respective permit to direct the study in search of the physicochemical and bacteriological characterization of its surface waters. during the period of November 2018 - January 2019, samples were collected in the morning and evening hours from 6 sampling points. A total of 48 samples were analyzed, 100% of which complied with the current regulations of the TULSMA quality indexes, for: temperature, hydrogen pH, nitrates, nitrites, turbidity, sulphates, ammonia, DBO, total dissolved solids, and total coliforms; alkalinity, electrical conductivity below the established, Total Aerobic Mesophiles were in accordance with the OMS. Likewise, the identification process was followed through the application of cultures and biochemical tests that contributed to the recognition of 6 different strains, subsequently inoculated in order to evaluate their behavior against 10 antibiotics: AMC, SAM, CXM, CTX, CN, AK, TE, OFX, F, and SXT. Result strains: K. ozaenae was 100% sensitive; P. vulgaris was resistant to tetracycline and nitrofurantoin; E. cloacae and E. agglomerans were sensitive to cephalosporins, aminoglycosides, tetracycline, quinolone, nitrofurantoin, and trimethoprim/sulfamethoxazole; S. marcescens had intrinsic resistance; and E. aerogenes was resistant to a combination of cefuroxime and β-lactams. Results are consistent with what is described by the CLSI, 2019. The acceptance of this aquifer, in accordance with the designated criterion (for purposes of consumption and domestic use), was secured through the Water Quality Index. The aquifer was given a score of 82%, placing it within the codified range to decree it as pollution free.