In a research conducted by the Water Research Institute (WRI), there were traces of two heavy metals, arsenic and mercury, found in the Birim River that had been considered as harmful by the World Health Organisation (WHO).
Although the WRI found small traces of the dangerous chemicals in the river, the WHO observed that such quantities could still cause serious health problems, including a threat to the development of a child in the womb.
http://peacefmonline.com/pages/local/social/201704/310643.php
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