青岛近海碱度的研究及其测定方法的比较  

The Total Alkalinity of Seawater in Coastal Waters of Qingdao and Comparison of Different Determination Methods

作　　者：高彩霞[1] 刘春颖[1] 李铁[1] 祝陈坚[1] 张海波[1] 

机构地区：[1]中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2014年第3期64-70,共7页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41176062);国家基础科学人才培养基金项目(J1103313)资助

摘　　要：2012年春季以青岛近海为研究海域，采用pH单点法、自动电位滴定法及溶解无机碳（DIC）计算法测得海水总碱度（Alk），并对这3种方法进行比较；探讨该海域海水Alk的分布特征及影响因素；对过滤前后样品的Alk差值与叶绿素（Chl—α）间的相关性进行分析。结果表明：DIC计算法和pH单点法得出的Alk误差较大，电位滴定法测定的Alk结果精密度较高；青岛近海海域表层水体中Alk范围为2070--2364μmol／kg，其平均值2310μmol／kg；过滤前后样品的Alk差值与Chlα含量具有一定的相关性，表明浮游植物和颗粒物对Alk有影响。In this study, we determined the concentrations of the total alkalinity （Alk） in seawater of Qingdao coast in spring, 2012 and compared three methods of Alk including pH one-point method, auto- matic potentiometric titration and the calculation value based on DIC and pH. The results showed that the Alk determined by the pH one-point method fluctuated significantly. The accurancy of automatic po- tentiometric titration is higher than the other methods. The range of Alk in coastal waters of Qingdao was 2 070~2 364/lmol/kg and the average was 2 310/~mol/kg. We also discussed the effect of biogeo- chemical processes by comparing Alk of unfiltered seawater to that of filtered seawater. The results in- dicated that the contribution of organic particle, phytoplankton and bacterial cell are important factors when evaluating the Alk.

关 键 词：海水总碱度 方法比校 影响因素 分布中图法 

分 类 号：P736.4[天文地球—海洋地质]