论文部分内容阅读
研究渤海埕岛油田海域表层沉积物对磷酸盐(以P计)的吸附特征,探究沉积物的再悬浮对其源汇作用的影响。通过批量实验模拟悬浮物固体浓度变化对P吸附解吸产生的影响,并且用修正后的Langmuir吸附等温式对实验结果进行拟合,计算沉积物的临界P平衡浓度(EPC0);并探讨pH变化对吸附量的影响。结果表明,当悬浮物浓度在(0.5~2.0)g/L范围内,研究海域沉积物EPC0值在(0.004 04~0.008 74)mg/L之间,并且随着固体浓度的增加,沉积物EPC0值相应增大,但此值整体低于该海域海水中P的浓度,因此再悬浮沉积物主要表现出P汇的作用;沉积物在pH为7.71时对P吸附量最大,即研究海域海水酸碱度有利于P吸附。
The adsorption characteristics of phosphates (P) in surface sediments of Chengdao oil field in the Bohai Sea were studied, and the effects of sediment resuspension on their source and sink were studied. The effect of the change of solid concentration on the adsorption and desorption of P by batch experiments was simulated, and the experimental results were fitted by the modified Langmuir adsorption isotherm to calculate the critical P equilibrium concentration (EPC0) of the sediments. Effect of adsorption amount. The results showed that when the concentration of suspended solids was in the range of (0.5 ~ 2.0) g / L, the value of EPC0 was 0.004 04 ~ 0.008 74 mg / L in the study area, and with the increase of solid concentration, The value of sediment is correspondingly increased, but this value is lower than the concentration of P in the seawater. Therefore, the resuspended sediments mainly show the effect of P sinks. The maximum adsorption amount of P on the sediments at pH 7.71 is the pH P adsorption is conducive to.