September 20, 2010
- A d v e r t i s e m e n t
An IQ comparison shows that Canadian regulations on manganese in drinking water should be updated to protect children, Quebec researchers say.
The average IQ of children whose tap water was in the upper 20 per cent of manganese concentration was six points below children whose water contained little or no manganese, the researchers found.
The study looked at 362 children aged six to 13. The amount of manganese from tap water and food was estimated, based on the results of a questionnaire.
Manganese is a naturally occurring metal found in groundwater. It is an essential nutrient, but in excessive amounts, it can damage the nervous system. It occurs in naturally high levels in several parts of Quebec, New Brunswick and other regions, researchers say.