Rapid determination of soluble reactive silicate in seawater by flow injection analysis with spectrophotometric detection and its application

基于酸性条件下硅酸盐与钼酸铵反应生成硅钼黄而后被还原成硅钼蓝的原理,利用流动注射分析技术,建立了快速测定海水中活性硅酸盐的分析方法.在优化的条件下,方法检测限为0.5μMOl·l-1,线性范围为2.5~110.0μMOl·l-1,实际海水的加标回收率为103.6%~109.3%,同一水样连续测3次仅需4.5MIn.测定硅浓度11.7μMOl·l-1的南海海水样,相对标准偏差(rSd)为1.6%(n=12).该方法具有简单、快速、水样消耗少、盐度高于14即不干扰测定等优点,成功地用于厦门西港海水中活性硅酸盐浓度的测定.A new flow injection analysis method for rapid determination of soluble reactive silicate in seawater is established based on the reaction of silicate with ammonium molybdate to form a yellow silicomolybdate complex,and further reduction to silicomolybdenum blue by ascorbic acid.Under the optimum conditions,the detection limit was 0.5 μmol · L-1;the linear and recovery ranges for real seawater samples were 2.5--110.0 μmol · L-1 and 103.6%--109.3%,respectively.Only 4.5 min was needed to analyze one sample in triplicate.The relative standard deviation(RSD) was 1.6%(n=12) for seawater samples obtained from the South China Sea with a silicate concentration of 11.7 mol · L-1.The proposed method is simple,fast,requires little sample,and showed no interference from salinity(>14).The method was successfully applied to measure the soluble reactive silicate in seawater samples in Xiamen's Western Harbor.国家高技术研究发展计划资助项目(No.2007AA061501)---

Nutrients Monitoring at Western Xiamen Harbor and Application of the On-line Filtration System

水体富营养化（eutrophication）是当今威胁近海海洋生态系统最大的环境问题之一，近岸海域的富营养化问题近年来一直受到极大关注。在河口、海湾区等特定的环境条件下，由于受地表径流注入、工业和生活污水排放及海水养殖排污等影响，富营养化问题尤为严重。营养盐浓度是富营养化重要指标之一，因此在河口进行长期的营养盐浓度监测，对了解该水域富营养化的状况、揭示河口富营养化形成机制和特点、提出相应对策和方法、保护该水域的生态环境显得尤为重要。 本课题组在位于福建九龙江河口处采用海水脱硫技术（SeawaterFlueGasDesulfurization）的SY燃煤电厂的温排水口海域，进行了长期的营养盐（...Eutrophication is one of the most serious environmental problems that threatens the coastal and shelf ecosystems, and the eutrophication in coastal areas has been greatly concerned in recent years. Under some certain circumstances in some estuaries and gulfs, eutrophication is especially serious, as the results of runoff of surface water, discharge of industrial and domestic wastewater and maricul...学位：理学硕士院系专业：海洋与环境学院环境科学与工程系_环境科学学号：2262009115121