碱式碳酸镁为新结合相的薄膜梯度扩散技术原位富集测定富营养水体中的磷

发布时间：2018-05-24 13:23

本文选题：薄膜梯度扩散技术 + 碱式碳酸镁　；参考：《分析化学》2016年06期

【摘要】：薄膜扩散梯度技术(Diffusive gradients in thin films technique,DGT)是近年来应用于自然水体、沉积物和土壤中活性磷原位测定的一种新技术。利用含碱式碳酸镁的聚丙烯酰胺凝胶膜为DGT新结合相,探讨了初始浓度、放置时间、p H值及离子强度对组装后DGT吸附性能的影响。用10 m L 0.25 mol/L H2SO4对结合相进行洗脱,洗脱率为85%±5%。组装后DGT对磷的测定不受溶液p H值(4.10~9.15)和离子强度(0.001~0.05 mol/L)的影响。在温度25℃,p H 7.00,磷初始浓度为2 mg/L时,DGT对磷的最大吸附容量为20.4μg。初始磷浓度为0.001~20 mg/L时,新DGT测定值与磷钼蓝比色法测定值一致。本方法对磷的检出限为102.4 ng/L。将碱式碳酸镁-DGT和商品化的Ferrihydrite-DGT应用于合成海水、厦门近岸海水、易海、巢湖水和南淝河中的对比检测,结果表明,碱式碳酸镁-DGT能更准确测定不同水体中磷浓度。
[Abstract]:Diffusive gradients in thin films technique (DGT) is a new technology applied to the determination of active phosphorus in natural water, sediment and soil in recent years. The initial concentration, time, P H value and ionic strength are discussed by using the polyacrylamide gel membrane containing basic magnesium carbonate as the new binding phase of DGT. The effect of DGT adsorption properties after assembly. The binding phase was eluted with 10 m L 0.25 mol/L H2SO4. After the elution rate was 85% + 5%., the determination of phosphorus was not affected by the H value (4.10~9.15) and ionic strength (0.001~0.05 mol/L) of the solution. At the temperature 25, 7, and the initial concentration of phosphorus was 2, the maximum adsorption capacity of phosphorus was 20.4 mu. When the initial phosphorus concentration is 0.001~20 mg/L, the determination value of the new DGT is the same as that of the phosphorus molybdenum blue colorimetric method. The detection limit of this method is 102.4 ng/L., the alkaline magnesium carbonate -DGT and the commercialized Ferrihydrite-DGT are applied to the synthetic sea water, the coastal waters of Xiamen, the Yihai, Chaohu water and the South Fei River are compared. The results show that the alkaline magnesium carbonate -D is found. GT can be more accurate to determine the concentration of phosphorus in different water bodies.
【作者单位】：安徽建筑大学材料与化学工程学院;
【基金】：安徽省自然科学基金(No.1608085MB43) 国家自然科学基金项目(Nos.21107001,21371005) 安徽省高校自然科学研究重点项目(No.KJ2016A154) 2014年安徽省高校优秀青年人才支持计划项目资助~~
【分类号】：X832;O657.3

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