A study presented at the Chilean Geological Congress, at the University of Concepción, indicated that Some brands of bottled water would not be suitable as "potable" because they would have high levels of arsenic.
The work found that, Although all the waters present this element, a third of the samples analyzed contained concentrations higher than those established in the standard of drinking water. They also detected excessive presence of nitrate, boron and other dissolved elements.
BioBioChile contacted the researchers to know the specific brands that were studied, to which they answered that the three brands in which high level of arsenic was detected are Puyehue, Tottus and Jahuel.
Of course, they ensured that, according to the norm that regulates bottled water, these levels would obey the established.
The research titled "The water we drink: physical-chemical results of some Chilean bottled waters", corresponds to scientists from the Department of Geology and researchers at the Center of Geothermal Excellence in Los Andes, University of Chile.
Arsenic, Nitrate and Boron
Although its results indicate that the quality of the analyzed waters is generally good and complies with Chilean legislation,3 of the 10 samples analyzed exceed the permitted concentrations of arsenic, according to the Chilean drinking water standard (NCH409 / 1) and the value suggested by the World Health Organization (WHO) and the US Environmental Protection Agency, or 10 parts per billion, "the report said. document
Moreover, in 4 samples, NO3 (nitrate) levels were detected higher than the natural ones of groundwater, which led to suppose a very superficial origin of the water.
In some analyzes, the values of boron are relatively high and have found concentrations of uranium, whose origin is in the processes of interaction with volcanic rocks.
On the other hand, it was determined that Although the filtered bottled waters contain minimal amounts of dissolved elements, they do not meet all the parameters established in the Chilean standard.. In one sample, the pH is slightly more acidic than the setpoint.
In the 10 watermarks in plastic bottles, 32 chemical elements were analyzed, including minor and trace elements.
"The findings of this study allow us to recognize inconsistency between the regulation regulating bottled water and regulating the supply of drinking water. In fact, some of the bottled waters analyzed do not meet the latest and would not be suitable as drinking water, "the researchers said.
At present, companies are not required to declare the chemical composition of bottled water, when advertising signals as healthy and pure waters.
By 2015, more than 460 million liters were sold in Chile. The results also show that there is no clear price-quality relationship.
Soon, the authors intend to extend this study to all brands of water available for sale in the Chilean market.