Effect of major cations ( Ca ( 2+ ) , Mg ( 2+ ) , Na ( + ) , K ( + ) ) and anions ( SO 42- , Cl ( - ) , NO 3- ) on Ni accumulation and toxicity in aquatic plant ( Lemna minor L. ) : implications For Ni risk assessment .
O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-MAT I-MAT O B-MAT I-MAT I-MAT I-MAT O B-MAT I-MAT O O B-MAT O O O O O O O O O O O O O O B-MAT O O O