海水中活性硅酸盐的流动注射-分光光度快速测定法及其应用

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镅蓝的原理,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0.5 μmol·L-1,线性范围为2.5～110.0 μmol·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4.5 min...

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

Based on the reactions of silicate with ammonium molybdate to form a yellow silicomolybdate complex, and further being reduced to silicomolybdenum blue by ascorbic acid, a new flow injection analysis method for rapid determination of soluble reactive silicate in seawater has been established. Under the optimum conditions, the detection limit was 0.50 µmol•L-1, the linear and recovery ranges for real seawater sample were 2.5 µmol•L-1 ~ 110 µmol•L-1 and 103.6% ~ 109.2%, respectively. Only 4.5 min was needed to analyze one sample in triplicate. The relative standard deviation (RSD) was 1.58% (n=12) for seawater sample obtained from South China Sea with a silicate concentration of 11.67 µmol•L-1. The proposed method was simple, fast, sample saved, and had no interference from salinity (>14). This method had been successfully applied to measure the soluble reactive silicate in seawater samples in Xiamen Western Harbor.