The study, presented at the Chilean Geological Congress, at the University of Concepcion, some brands of bottled water would not be suitable for "drinking", according to the Chilean standards themselves.
He found work One-third of the analyzed samples showed concentrations of arsenic above what was determined. They also discovered the excessive presence of nitrates, borons and other soluble elements.
Research entitled "The Water We Drink: The Physico-Chemical Results of Some Chillies in Bottled Water" corresponds to scientists from the Department of Geology and Researchers at the Geothermal Center of Excellence, Los Angeles, University of Chile.
Arsenic, nitrate and boron
Although their results indicate that the quality of the analyzed waters is generally good and that it is in compliance with the Chilean legislation "3 out of 10 analyzed samples exceed permissible arsenic concentrations, according to the standard of Chilean drinking water (NCH409 / 1) and the values proposed by the World Health Organization (WHO) and the United States Environmental Protection Agency, or 10 parts per billion, "the summary document
In addition, in 4 samples, the content of NO3 (nitrate) is detected higher than natural groundwater, which leads to the assumption of very superficial water origin.
In some analyzes, Boron values are relatively high and uranium concentrations are determined, originating in processes of interaction with volcanic rocks.
On the other hand, it was established that Although filtered bottled water contains minimal amounts of dissolved elements, they do not meet all the parameters set out in the Chilean standard. In the sample, the pH is slightly more acidic than the regulated value.
In 10 watermarks in plastic vials, 32 chemical elements were analyzed, including minors and traces.
"The findings of this study allow us to recognize inconsistency between regulating regulated bottled water and regulating drinking water supply. In fact, some of the bottled water analyzed is incompatible with this latter and will not be suitable for drinking water, "researchers said.
At present, companies are not obliged to declare the chemical composition of bottled water, when advertising signals them as healthy and clean water.
In 2015, more than 460 million liters were sold in Chile. The results also show there is no clear relationship between quality and quality.
Soon, the authors intend to extend this study to all water brands available for sale on the Chilean market.