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于 1 994年 5月— 1 995年 6月在实验室进行了不同磷酸盐浓度、pH条件下的悬浮物吸附解吸模拟实验 ,对黄河口磷酸盐的缓冲机制进行了探讨。黄河口悬浮物对磷酸盐的吸附量 (解吸量 )随磷酸盐浓度的增大而增大 (减小 ) ,零平衡时磷酸盐浓度 (EPC0 )值在 0 .4— 1 .3μmol/dm3之间 ,且随温度的升高和悬浮物粒度的增大而略有减小。黄河口悬浮物的线性吸附系数 (K)在 0 .0 3— 0 .40dm3/g之间 ,且随温度的升高呈线性关系增加 ,随悬浮物粒度的减小呈指数形式增加。盐度对EPC0 和K基本没有影响。在pH对黄河口悬浮物吸附和解吸磷酸盐的影响实验中 ,首次发现在pH约为 7.7— 9.3范围内存在“稳定pH范围” ,在此范围内悬浮物对磷酸盐的吸附量和解吸量不随水体pH值发生变化。此范围的大小和位置随实验条件不同而略有变化 ,稳定pH范围随温度的上升有所减小且左移 (pH减小方向 ) ,随着悬浮物粒度的增大稳定pH范围有所增大且右移。
In May 1994 - June 1995 in the laboratory under different phosphate concentration, pH, suspended solids adsorption and desorption simulation experiments on the Yellow River Estuary phosphate buffer mechanism were discussed. Phosphate adsorption amount (desorption amount) of suspended solids in the Yellow River estuary increased (decreased) with the increase of phosphate concentration, and the value of the phosphate concentration (EPC0) at zero equilibrium ranged from 0.4 to 1.3μmol / dm3 And decreases slightly with the increase of temperature and the increase of particle size of suspended solids. The linear adsorption coefficient (K) of the suspended sediment in the Yellow River Estuary was between 0. 0 and 3. 0. 40dm3 / g, and it increased linearly with increasing temperature. It increased exponentially with the decrease of particle size. Salinity has virtually no effect on EPC0 and K. In the experiment of the effect of pH on the adsorption and desorption of phosphate by suspended sediment from Yellow River Estuary, it was first found that there was “stable pH range” within the range of pH about 7.7- 9.3. The adsorption and desorption amount of phosphate by suspended solids Does not change with the pH value of the water. The size and location of this range vary slightly with different experimental conditions. The steady pH range decreases with decreasing temperature and moves to the left (decreasing direction of pH). As the particle size of the suspension increases, the stable pH range increases Big and right.