Eh and pH Measurement in Menfro and Mexico Soils

2015 ◽  
pp. 103-128 ◽  
Author(s):  
R. W. Blanchar ◽  
C. E. Marshall
Keyword(s):  
Ph Measurement

scholarly journals Regression Analysis of Orthogonal, Cylindrical and Multivariable Color Parameters for Colorimetric Surface pH Measurement of Materials

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3682
Author(s):  
Katarína Vizárová ◽  
Izabela Vajová ◽  
Naďa Krivoňáková ◽  
Radko Tiňo ◽  
Zdenko Takáč ◽  
...  
Keyword(s):  
Ph Value ◽  
Critical Factor ◽  
Ph Measurement ◽  
Ph Indicator ◽  
Water Quality Control ◽  
Quality Management Systems ◽  
Surface Ph ◽  
Regression Parameters ◽  
Ph Detection

The surface pH is a critical factor in the quality and longevity of materials and products. Traditional fast colorimetric pH detection-based tests such as water quality control or pregnancy tests, when results are determined by the naked eye, cannot provide quantitative values. Using standard pH papers, paper-printed comparison charts, or colorimetric microfluidic paper-based analytical devices is not suitable for such technological applications and quality management systems (QMSs) where the particular tested material should contain a suitable indicator in situ, in its structure, either before or after the process, the technology or the apparatus that are being tested. This paper describes a method based on the combination of impregnation of a tested material with a pH indicator in situ, its exposure to a process of technology whose impact on pH value is to be tested, colorimetric pH measurement, and approximation of pH value using derived pH characteristic parameters (pH-CPs) based on CIE orthogonal and cylindrical color variables. The hypotheses were experimentally verified using the methyl red pH indicator, impregnating the acid lignin-containing paper, and preparing a calibration sample set with pH in the range 4 to 12 using controlled alkalization. Based on the performed measurements and statistical evaluation, it can be concluded that the best pH-CPs with the highest regression parameters for pH are √∆E, ln (a),√∆H (ab), a/L, h/b and ln (b/a). The experimental results show that the presented method allows a good estimation of pH detection of the material surfaces.

Self-Assembled Fluorescent Bovine Serum Albumin Nanoprobes for Ratiometric pH Measurement inside Living Cells

2016 ◽  
Vol 8 (15) ◽  
pp. 9629-9634 ◽  
Author(s):  
Qiaoyu Yang ◽  
Zhongju Ye ◽  
Meile Zhong ◽  
Bo Chen ◽  
Jian Chen ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Living Cells ◽  
Ph Measurement ◽  
Self Assembled

Fiber optic sensor designs and luminescence-based methods for the detection of oxygen and pH measurement

Measurement ◽  
2021 ◽  
pp. 109323
Author(s):  
Jan Werner ◽  
Mathias Belz ◽  
Karl-Friedrich Klein ◽  
Tong Sun ◽  
K.T.V. Grattan
Keyword(s):  
Fiber Optic ◽  
Ph Measurement ◽  
Fiber Optic Sensor ◽  
Optic Sensor

Real-Time Downhole pH Measurement Using Optical Spectroscopy

2005 ◽  
Author(s):  
B. Raghuraman ◽  
M. O'Keefe ◽  
K.O. Eriksen ◽  
L.A. Tau ◽  
O. Vikane ◽  
...  
Keyword(s):  
Real Time ◽  
Optical Spectroscopy ◽  
Ph Measurement

Application of ISFETs for pH measurement in rain droplets

2001 ◽  
Vol 76 (1-3) ◽  
pp. 634-638 ◽  
Author(s):  
A. Poghossian ◽  
A. Baade ◽  
H. Emons ◽  
M.J. Schöning
Keyword(s):  
Ph Measurement

Estimation of primary pH measurement uncertainty using Monte Carlo simulation

Metrologia ◽  
2006 ◽  
Vol 43 (3) ◽  
pp. 306-310 ◽  
Author(s):  
J C Damasceno ◽  
R M H Borges ◽  
P R G Couto ◽  
A P Ordine ◽  
M A Getrouw ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Measurement Uncertainty ◽  
Ph Measurement ◽  
Primary Ph Measurement
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