邻硝基苯酚在黄河沉积物和水相间的平衡分配

Equilibrium partition behavior of o-nitrophenol between sediments and aqueous phase in the Yellow River

研究了邻硝基苯酚在黄河沉积物和水相间的分配行为 ,计算出中性分子和离子形态的分配系数Kd,Kdi以及总分配系数Kdo.结果表明 ,分配行为与体系的pH值有关 ,中性分子的分配系数Kd 随pH增大而增大 ,中性分子和离子形态的总分配系数Kdo在pH大于 6 .12时减小 ,当pH大于 5 .0 8时 ,吸附态分数在 0 .85以上 .

The equilibrium partition coefficients K d, K di and total partition coefficient K do of neutral molecule and charged ion of o-nitrophenol were calculated in the samples taken from the Yellow River. The results show that partitioning behavior relates with pH of the system. The partition coefficient K d of neutral molecule increases with system's pH increasing. The total partition coefficient K do of neutral molecule and charged ion decreases when system's pH is higher than 6.12, and the part of adsorption is more than 0.85 when system's pH is above 5.08.