基于液芯柱透镜测量磷肥水溶液的液相扩散系数  

Measuring Diffusion Coefficients of Water-soluble Phosphate Fertilizer Based on a Liquid-core Cylindrical Lens

作　　者：周志和 刘哲 李黎 孟伟东 普小云 ZHOU Zhihe;LIU Zhe;LI Li;MENG Weidong;PU Xiaoyun(Department of Physics, Yunnan University, Kunming 650091, China)

机构地区：[1]云南大学物理与天文学院物理系,云南昆明650091

出　　处：《光散射学报》2021年第2期171-178,共8页The Journal of Light Scattering

基　　金：国家自然科学基金(11804296)。

摘　　要：磷肥水溶液在水体中的扩散是造成湖泊水质富营养化的重要原因之一。本文基于液芯柱透镜构建的光学检测系统,用“等折射率薄层”移动方法,在室温下(25℃)分别测量了磷酸氢二铵(DAP),磷酸二氢铵(MAP)和磷酸二氢钾(KDP)三种磷肥水溶液的液相扩散系数(D值),测量结果分别为D_(DAP)=(1.012±0.019)×10^(-5)cm^(2)/s,D_(MAP)=(1.030±0.042)×10^(-5)cm^(2)/s和D_(KDP)=(1.019±0.097)×10^(-5)cm^(2)/s,并用“泰勒分散法”验证了测量结果的正确性。三种磷肥水溶液液相扩散系数的准确测量,对湖泊水污染过程数学模型的建立及求解具有重要的应用价值,其在湖泊水污染的防治方面有重要的科学和环保意义。The diffusion of phosphorus fertilizer in water solution is one of main reasons for the eutrophication of lake water.Based on a liquid-core cylindrical lens,the liquid diffusion coefficients at room temperature of three aqueous phosphorus fertilizers,that are diammonium hydrogen phosphate(DAP),ammonium dihydrogen phosphate(MAP)and potassium dihydrogen phosphate(KDP),have been measured by using an optical method called the shift of thin layer with equivalent refractive index(RI),the measured results are D_(DAP)=(1.012±0.019)×10^(-5)cm^(2)/s,D_(MAP)=(1.030±0.042)×10^(-5)cm^(2)/s and D_(KDP)=(1.019±0.097)×10^(-5)cm^(2)/s,respectively.The Taylor dispersion method is used to measure the same phosphorus fertilizers to verify the measured results.The measurements of diffusion coefficients of three water-soluble phosphate fertilizers are useful for establishing and solving pollution model of lake water,which is of important significance both in science and environmental protection.

关 键 词：液相扩散系数 液芯柱透镜 等折射率薄层移动法 磷肥水溶液 水体富营养化 

分 类 号：X524[环境科学与工程—环境工程]