with 0,1 mg/l. by the contrary, mexico was the one with the higher limit value with 1,5 mg/l. among the latin-american countries, colombia is the only one that is mentioned as having gold mining industry. the limit value for cyanide is quite high (1 mg/l) to the limit value of argentina. however, three more other countries have the same limit value for cyanide. hexavalent chromium hexavalent chromium is a toxic component that can cause allergic reactions on the skin and also several problems in the respiratory system. this is a component present in the industries of chemicals, leather, textiles, and electro painting, among others. the minimum requirement for this element is presented in bolivia (0.1 mg/l), and the maximum is presented in mexico (0.75 mg/l). despite brazil being one of the main producers of chromium, it doesn't have a maximum limit as do other countries.