水质特性影响下的Ca^(2+)解吸试验研究

Experimental study of Ca^(2+) desorption influenced by water quality

为了探讨河口地区泥沙颗粒与溶解性物质之间的界面作用,以对天然河道细颗粒泥沙的运动有较大影响且含量相对较高的Ca2+作为典型离子,采用静态试验方法,初步研究了解吸溶液中阳离子初始浓度、种类及伴随阴离子差异等水质特性对Ca2+解吸规律的影响。结果表明,随着解吸溶液中阳离子初始浓度的增加,Ca2+解吸总量呈增加趋势,且趋于一极大值,解吸总量的增加值逐渐减小;H+条件下的Ca2+解吸总量最大,NH4+时次之,Na+时最小;Cl-伴随条件下的Ca2+解吸总量略大于NO3-;对Ca2+解吸起主要影响作用的是阳离子,而非阴离子。

In order to discuss the interface function of sediment particles and dissolved substances in estuary area,taking Ca^2＋ as the representative cation,which is largely existed in rivers and has significant influence on the fine sediment movement,and based on the static experimental method,we primarily investigated the influence of water quality,including initial cation concentration,category and different accompanying anions on the desorption of Ca^2＋.The results indicated that,the total desorption quantity of Ca^2＋ increased gradually and reached to the maximum with the increment of initial cation concentration in desorption solution,while the increment value of Ca^2＋ desorption decreased.The total desorption quantity of Ca^2＋ for H^＋,NH4^＋ and Na^＋ were different and followed the order of H^＋,NH4^＋ and Na^＋.The total desorption quantity of Ca^2＋ for the accompanying anion of Cl^-was slightly larger than that for the accompanying anion of NO3^-.Therefore,the key influential factor of Ca^2＋ desorption were cation,not anions.