Abstract
The bactericidal efficiency of silver nanoparticles (AgNP) was evaluated against bacteria isolated from surface and ground water samples in Egypt. The AgNP were synthesized by typical one-step synthesis protocol, and were characterized using transmission electron microscopy and atomic absorption spectrophotometer. The bactericidal efficiency of AgNP was evaluated by its application in three concentrations i.e., 0.1, 0.05 and 0.01 ppm to water sample, and allowed to interact with bacteria for different duration e.g., 5 min 15 min, 30 min, 1 h and 2 h. Then, the bactericidal efficiency of AgNPs was determined by comparing the counted bacteria before and after the treatments. Higher mean values of total bacterial count (TBC), total coliform count (TCC), and total streptococcal count (TFS) were detected in surface water than in ground water. Also, the results showed that TBC, TCC and TFS exceeded permissible limits. Application of AgNP at different concentration, the number of bacteria in TBC was significantly reduced in all AgNP-exposed samples as compared to the control group (p
Highlights
Water-borne disease is considered as the leading cause of death in many countries especially in developing countries (Yehia and Sabae, 2011)
Antibacterial effects of AgNP in total coliform count (TCC): Findings of this study revealed that the highest mean of TCC was found in the control groups of the three concentrations (309.4±117.5, 255.4±117.6 and 310.6±134.7 CFU/100 mL), while the lowest mean was found with 0.1 ppm of AgNP used after 1 h and 2 h (2.8±0.9 and 13.8±6.4, respectively) (Table 3)
The results describes the possibilities of the use of AgNP as an alternate in water treatment facilited by bactericidal acitivity of AgNP
Summary
Water-borne disease is considered as the leading cause of death in many countries especially in developing countries (Yehia and Sabae, 2011). Over one billion people lack access to fresh water, and this condition is responsible for death of two million people per anum (WHO, 2004; UNESCO, 2006; Halem et al, 2009; WHO/UNICEF, 2012). Drinking water sources receive heavy loads of microorganisms through several ways like industrial, agricultural, and domestic wastes (Annual Drinking Water Quality Report, 2005). Detection of organisms that are normally present in feces of human and other warm-blooded animals is used as the indicator of fecal contamination. Indicator bacteria such as total coliform bacteria, fecal coliform, and fecal streptococci are widely used for the assessment of fecal contamination and possible water quality deterioration in fresh water sources (APHA, 1993, 2005)
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