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Estimating EC and ionic EC contribution percentage of nutrient solution based on ionic activity

International Journal of Agricultural and Biological Engineering 2019年第2期12卷 42-48页

作者： Jinxiu Song Lin Xu Dongxian He Satoru Tuskagoshi Toyoki Kozai Yutaka Shinohara Key Laboratory of Agriculture Engineering in Structure and Environment of Ministry of Agriculture and Rural Affair China Agricultural UniversityBeijing 100083China Chiba University KashiwaChiba 277-0882Japan Japan Plant Factory Association KashiwaChiba 277-0882Japan

The dynamic monitoring technology of inorganic ions using ion selective electrodes has some problems such as low precision,vulnerability to other ions,short service life,and high *** to the difficulty of dynamic control based on ionic concentration of nutrient solution,EC and pH values of nutrient solution are often used as feedback control indexes in hydroponic *** this study,estimation algorisms of EC and ionic EC contribution percentage based on ionic activity were proposed to understand the quantitative relationship between ionic concentration and *** a view to predicting the EC accurately by mean ionic activities of specific salts in nutrient solution based on a specific formula,ionic concentration could also be calculated by the actual measurement of EC combined with ionic EC contribution *** Japanese horticultural experimental nutrient formula and Yamasaki tomato nutrient formula,significant linear correlations between estimated EC and measured EC were found with determination coefficients over *** EC contribution percentage was not affected by different relative concentrations of nutrient ***,ionic EC contribution percentage changed significantly when adding specific salts with different concentrations,and different changes were found in each anions and cations of specific salt *** the same K+concentration was added in different forms of KNO_(3),K_(2_SO_(4),KCl,and KH_(2)PO_(4),the changes of ionic EC contribution percentage of K^(+)were similar,but those of other anions in potassium salts varied *** relative errors of estimated EC of nutrient solutions based on ionic activities were only 1.3%in horticultural experimental nutrient solution and 1.8%in Yamasaki tomato nutrient solution with different relative concentrations compared to measured *** relative errors of estimated EC of nutrient solutions with specific salt added were only 0.1%-0.5%compared to measured EC in two nutrient solution.T

关键词： hydroponics nutrient solution ionic activity soilless culture Debye-Hückel limiting equation ionic EC contribution percentage nutrient formula solution dynamic control

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A theoretical exploration of the influencing factors for surface potential

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Chinese Physics B 2015年第6期24卷 629-636页

作者：刘新敏杨刚李航田锐李睿丁武泉袁若 Chongqing Key Laboratory of Soil Multi-scale Interfacial Process College of Resources and EnvironmentSouthwest University School of Chemistry and Chemical Engineering Southwest University

Although it has been widely used to probe the interracial property, dynamics, and reactivity, the surface potential remains intractable for directly being measured, especially for charged particles in aqueous solutions. This paper presents that the surface potential is strongly dependent on the Hofmeister effect, and the theory including ion polarization and ionic correlation shows significant improvement compared with the classical theory. Ion polarization causes a strong Hofmeister effect and further dramatic decrease to surface potential, especially at low concentration; in contrast, ionic correlation that is closely associated with potential decay distance overestimates surface potential and plays an increasing role at higher ionic concentrations. Contributions of ion polarization and ionic correlation are respectively assessed, and a critical point is detected where their contributions can be exactly counteracted. ionic correlation can be almost neglected at low ionic concentrations, while ion polarization, albeit less important at high concentrations, should be considered across the entire concentration range. The results thus obtained are applicable to other interfacial processes.

关键词： Hofmeister effect ionic activity interfacial process potential distribution

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