黄河口磷酸盐缓冲机制的研究Ⅱ.黄河口磷—钙矿物的离子平衡

1994年5月—1995年6月，利用黄河口悬浮颗粒物，在实验室内于不同温度、盐度、磷酸盐浓度、pH值及悬浮物粒度条件下进行了悬浮物对磷酸盐的吸附和解吸模拟实验，通过水体中几种磷—钙矿物的离子平衡计算，对黄河口磷酸盐的缓冲机制进行了探讨。结果表明，黄河口现场条件下水体中钙与磷之间存在某些离子平衡，黄河口水体中磷—钙矿物的离子积受温度、悬浮物种类及粒度影响较小，而与水体盐度、磷酸盐及钙含量有关，但不足以形成磷—钙矿物沉淀；磷—钙矿物的沉淀和溶解在黄河口磷酸盐浓度的控制机制上所起的作用较小，而悬浮颗粒物表面对磷酸盐的吸附和解吸起了较大的作用。

DISCUSSION OF PHOSPHATE BUFFER MECHANISM IN HUANGHE RIVER ESTUARY II. THE IONIC EQUILIBRIUM OF Ca-P MINERAL PHASES IN HUANGHE RIVER ESTUARY

In May 1994 to June 1995, the effect of adsorption and desorption of phophate by vallous sizes of HUanghe estuarine suspended particles were inveshgated by means of simulation exPeriments for the Huanghe River estuary in the laboratory, undr vallous condihons of temperabe,salihity, phosphate concentration and pH value. The phosphate buffer mechanism in the Huanghe River estuary was discussed by means of the ionic equilibrium of several Ca-P mineral phaes in the warer.There exists ionic equllibrium between calcium and phosphate in the Huanghe estuary, and saiinity, phosphate and calcium concentrations have a more significan effect on the ionic eqinlibrium than tha of temperabe and the type and size of suspended particles. It is 1ikely tha Ch and P may combine to becom ion parts or compounds in the water, bu thes is not enough to precipitate the Ca-P mineral phases. In the control of the phosphate buffer mechanism, the precipitation and dissolution of Ca-P mineral phases are less effechve and the adsorption and desorphon of phosphate by the surface of suspended particles have a great effect in the Huanghe River estuary.