Methods of air ion concentration measurement

2006 ◽  
Author(s):  
Miloslav Steinbauer ◽  
Tomas Vojtek ◽  
Petr Drexler
Keyword(s):  
Concentration Measurement ◽  
Ion Concentration ◽  
Air Ion Concentration

scholarly journals A Low Excitation Working Frequency Capacitively Coupled Contactless Conductivity Detection (C4D) Sensor for Microfluidic Devices

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6381
Author(s):  
Yuchen He ◽  
Qiang Huang ◽  
Yu He ◽  
Haifeng Ji ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Conductivity Measurement ◽  
Microfluidic Devices ◽  
Experimental Results ◽  
Concentration Measurement ◽  
Ion Concentration ◽  
Capacitively Coupled ◽  
Contactless Conductivity Detection ◽  
Lc Circuit ◽  
Li Ion ◽  
Working Frequency

In this work, a new capacitively coupled contactless conductivity detection (C4D) sensor for microfluidic devices is developed. By introducing an LC circuit, the working frequency of the new C4D sensor can be lowered by the adjustments of the inductor and the capacitance of the LC circuit. The limits of detection (LODs) of the new C4D sensor for conductivity/ion concentration measurement can be improved. Conductivity measurement experiments with KCl solutions were carried out in microfluidic devices (500 µm × 50 µm). The experimental results indicate that the developed C4D sensor can realize the conductivity measurement with low working frequency (less than 50 kHz). The LOD of the C4D sensor for conductivity measurement is estimated to be 2.2 µS/cm. Furthermore, to show the effectiveness of the new C4D sensor for the concentration measurement of other ions (solutions), SO42− and Li+ ion concentration measurement experiments were also carried out at a working frequency of 29.70 kHz. The experimental results show that at low concentrations, the input-output characteristics of the C4D sensor for SO42− and Li+ ion concentration measurement show good linearity with the LODs estimated to be 8.2 µM and 19.0 µM, respectively.

Highly sensitive chloride ion concentration measurement based on a multitaper modulated fiber

2019 ◽  
Vol 58 (08) ◽  
pp. 1
Author(s):  
Lijiao Zu ◽  
Hongmin Zhang ◽  
Chengwei Fei ◽  
Yinping Miao ◽  
Bin Li ◽  
...  
Keyword(s):  
Chloride Ion ◽  
Concentration Measurement ◽  
Ion Concentration ◽  
Highly Sensitive

scholarly journals Mobile Ion Concentration Measurement and Open-Access Band Diagram Simulation Platform for Halide Perovskite Solar Cells

Joule ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 109-127 ◽  
Author(s):  
Luca Bertoluzzi ◽  
Caleb C. Boyd ◽  
Nicholas Rolston ◽  
Jixian Xu ◽  
Rohit Prasanna ◽  
...  
Keyword(s):  
Solar Cells ◽  
Open Access ◽  
Perovskite Solar Cells ◽  
Concentration Measurement ◽  
Ion Concentration ◽  
Simulation Platform ◽  
Band Diagram ◽  
Halide Perovskite ◽  
Mobile Ion Concentration

scholarly journals Study on the change of negative air ion concentration and its influencing factors at different spatio-temporal scales

2020 ◽  
Vol 23 ◽  
pp. e01008 ◽  
Author(s):  
Hui Wang ◽  
Bing Wang ◽  
Xiang Niu ◽  
Qingfeng Song ◽  
Mingwen Li ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Ion Concentration ◽  
Temporal Scales ◽  
Spatio Temporal ◽  
Air Ion Concentration

STUDY OF THE EFFECT OF RELATIVE HUMIDITY ON THE OPERATING MODES OF THE IONIZER

2018 ◽  
pp. 52-54
Author(s):  
A.D. Rakhmatov ◽  
S.R. Namozov
Keyword(s):  
Relative Humidity ◽  
Ion Concentration ◽  
Storage Tanks ◽  
Air Humidity ◽  
Fruit Storage ◽  
Operating Modes ◽  
Relative Air Humidity ◽  
Concentration Of Ions ◽  
Theoretical Assumptions ◽  
Air Ion Concentration

When using electro-ionizers in the conditions of the fruit storage facilities, it is necessary to take into account the influence of environmental conditions of the electrical ionizers. A particularly important factor here is the relative humidity of the air in the storage tanks. At higher values of the relative humidity of air in the atmosphere of the fruit storage, air ion combine with water molecules to form heavy ions, as a result of which the volume concentration of ions decreases. To test these theoretical assumptions, we conducted studies of the operating parameters of the ionizer under condition of storage tanks high relative air humidity. Studies have shown that under conditions of high air humidity the concentration of ion decreases by 10–12% and at a distance of 1 meter from the ionizer, the air ion concentration is 1,6∙1013 ion/m3.

Development of Ion Concentration Measurement Method for Minute Volume of Blood Using Terahertz Chemical Microscope

2021 ◽  
Author(s):  
Katsuya Taniizumi ◽  
Hiroki Nagata ◽  
Masaki Ando ◽  
Atsuya Mahana ◽  
Jin Wang ◽  
...  
Keyword(s):  
Measurement Method ◽  
Minute Volume ◽  
Concentration Measurement ◽  
Ion Concentration

Study of Air Anion Concentration in Various Water Statuses

2012 ◽  
Vol 518-523 ◽  
pp. 241-244 ◽  
Author(s):  
Wei Wang ◽  
Feng Shi
Keyword(s):  
Wind Speed ◽  
Urban Planning ◽  
Relative Humidity ◽  
Ion Concentration ◽  
Anthropogenic Sources ◽  
Ecological Environment ◽  
Coastal Province ◽  
Mutual Relations ◽  
Air Ion Concentration ◽  
Planning And Construction

Atmospheric ions are produced by many natural and anthropogenic sources and their concentrations vary widely between different environments. In this study, we conducted in a southern coastal province of China, where we chose some typical sites to observe. The observations included negative air ion concentration, positive air icon concentration, wind speed, temperature and relative humidity, and negative air icon concentration in materials and plants. The results showed that negative air icon concentration changed more obviously in different water statuses, and showed a certain degree of mutual relations. In order to improve the urban ecological environment, the authors proposed the use of water and wind actively to increase the distribution of negative air anion concentration in urban planning and construction.

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