Journal Article 875 Quaternary Ammonium Compounds 839 Research Support, Non-U.S. Gov't 566 N762921K75 230 Nitrogen 230 Nitrates 164 Water Pollutants, Chemical 138 mehr ... Surface-Active Agents 115 Sewage 107 059QF0KO0R 95 Water 95 Nitrites 83 Research Support, U.S. Gov't, Non-P.H.S. 76 Oxygen 73 S88TT14065 73 Cations 62 Phosphates 56 7440-44-0 53 Carbon 53 Micelles 47 26062-79-3 45 27YLU75U4W 45 Phosphorus 45 Polyethylenes 45 Polymers 45 poly-N,N-dimethyl-N,N-diallylammonium chloride 45 Solutions 41 Industrial Waste 39 Membranes, Artificial 39 Plant Proteins 39 weniger ...