Water pH is a dimensionless measure of the activity of hydrogen ions (H⁺) in aqueous systems, defined as the negative logarithm (base 10) of the hydrogen ion activity, and serves as a key parameter in water chemistry, environmental monitoring, and industrial processes. It influences speciation, solubility, and reactivity of inorganic and organic compounds, controls metal mobility and toxicity, and modulates biological processes such as microbial metabolism and enzyme activity. Accurate determination of water pH typically employs potentiometric measurements with glass electrodes calibrated against standard buffer solutions, with stringent control of temperature, ionic strength, and CO₂ exchange to ensure reproducibility and comparability in research and regulatory assessments.
Water is fundamental to all life—contaminants are harmful to humans and the environment. Herbicides used in agriculture to control weeds present a particular challenge here. The most widely used herbicide in the world is ...
Nanomaterials
Apr 29, 2026
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Chemists in South Korea have created a stable color-changing sensor that displays an easily quantifiable response to the pH of its surroundings. Published in Microsystems & Nanoengineering, Dong-Hwan Kim and colleagues at ...
Carbon dioxide in the atmosphere enters the ocean at the surface and has been increasing the acidity of Pacific waters since the beginning of the industrial revolution over 200 years ago. A new study, led by University of ...
Earth Sciences
Aug 19, 2025
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What can the pH level of the subsurface ocean on Enceladus tell us about finding life there? This is what a recent study accepted to Icarus hopes to address as a team of researchers investigated the potential pH level of ...
Astrobiology
Jun 30, 2025
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Ocean acidification, caused by the ongoing absorption of atmospheric CO₂, poses threats to marine ecosystems and biodiversity. Accurately assessing variations in seawater pH is crucial for evaluating biological responses ...
Earth Sciences
Mar 27, 2025
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