[Sources of harmful pollutants and prevention of their discharge].
D001151:Arsenic; D002104:Cadmium; D003485:Cyanates; D004787:Environmental Pollution / Q000517:prevention & control; D007220:Industrial Waste / Q000517:prevention & control*; D007854:Lead; D008626:Mercuribenzoates
D003485:Cyanates; D007220:Industrial Waste; D008626:Mercuribenzoates; D002104:Cadmium; D007854:Lead; D001151:Arsenic