Investigación de blastocystis sp. en agua de consumo humano en una población escolar de la zona rural del estado Mérida, Venezuela / Blastocystis sp. in drinking water at a rural school in Mérida, Venezuela

Para detectar la presencia de Blastocystis sp. en el agua de consumo de una escuela rural del estado Mérida, se recolectaron 36 muestras provenientes de la fuente natural que surte el tanque de distribución, del tanque y de los grifos, durante los meses de Septiembre 2008, Febrero y Diciembre del 2009 y Mayo 2010. El procesamiento de las muestras se realizó siguiendo la técnica propuesta por Suresh y col. (2005). Los resultados sugieren que el agua de consumo estaba exenta de Blastocystis o que la cantidad de quistes viables presentes en las muestras fue muy baja, lo que no permitió lograr la recuperación del parásito en el cultivo. Por ello se requiere el uso de técnicas más sensibles que permitan detectar cantidades bajas del microorganismo en aguas de consumo humano. El estudio de los hábitos de consumo de agua de la población estudiantil de la escuela rural, mostró que más de la mitad de la población consume agua hervida, esto probablemente se deba a que están conscientes que el agua a la cual tienen acceso proviene de una fuente natural no tratada

In order to determine the presence of Blastocystis sp. in drinking water at a rural school in Merida, 36 water samples were collected from natural sources that feed the distribution tank and faucets during the months of September, 2008, February and December, 2009, and May, 2010. Samples were processed using the technique proposed by Suresh et al. (2005). All samples were negative. These results suggest that the water was exempt from Blastocystis or that the quantity of viable cysts present in the samples was very low, not permitting reproduction in the culture. This report suggests the importance of using more sensitive techniques to detect low amounts of the organismin drinking water. The study of student water consumption habits at the rural school showed that more than half the population consume boiled water; probably, they are aware that the water source has not been treated for drinking

Radioactivity monitoring in drinking water of Zahedan, Iran

The present research has focused on the effect of radioactivity on drinking water from five sites in the region of Zahedan city. The measurement of water activity in wells, river and spring has been used as a screening method. The determination of gamma emitters was performed by use the application of gamma spectrometry. The values of Radium concentration was between less than 2 mBq/l to 3 +/- 0.4 for water wells, 5 +/- 0.4 mBq/L for river, and less than 2 mBq/L for spring. All values of activity in the selected water samples were lower than the permissible limit for drinking water consumption. The water was safe for drinking, washing and agricultural use