According to recent research, coffee can remove from tap water “78 to 90 per cent of dissolved heavy metals, such as lead and copper, because the coffee grounds, with uncharged or negatively charged molecules, attract the positively charged heavy metals, ” reports the Australian newspaper.
قال الكيميائي البيئي الدكتور مايك ماكلافلين :‏ « كلما كانت القهوة اقوى ،‏ صارت ازالة الفلزات الثقيلة افضل » .‏