Latest Acid-base chemistry Stories

2008-07-03 06:00:00

By Matthew D. LaPlante, The Salt Lake Tribune Jul. 3--For years, the military has insisted that there is no safer way to destroy its chemical weapons than the incineration process used at the Deseret Chemical Depot. But when the Pentagon floated the idea of moving more chemical weapons to Utah in a report last month, it noted that the increased workload would require increased capacity. And to meet that need it suggested another way to destroy the deadly agents: a process known as...

2008-06-25 12:03:01

U.S. environmental scientists say they have created one of the most comprehensive databases on the effects of acid rainfall. Prior to enactment of the U.S. Clean Air Act, unhindered industrial emissions were released into the air across the nation, with many of the chemicals falling back to Earth in the form of acid rain. Although scientists have long known acid rain can severely decrease the diversity of plant and animal communities in fresh water lakes and ponds, little is known about...

2008-05-16 06:00:00

By Ward, Weslyn C Lamb, Erin C; Gooden, David; Chen, Xin; Burinsky, David J; Simon, John D ABSTRACT Three naturally occurring pyrrole acids were found in Sepia, human black hair, and bovine choroid and iris melanosomes using high-performance liquid chromatography and mass spectrometry- pyrrole-2,3-dicarboxylic acid (PDCA), pyrrole-2,3,5-tricarboxylic acid (PTCA) and pyrrole-2,3,4,5-tetracarboxylic acid (PTeCA). PDCA and PTCA are common markers quantified from oxidative degradation of...

2007-12-11 06:00:10

By Garcia-Zubiri, Inigo X Burrows, Hugh D; de Melo, J Sergio Seixas; Pina, Joao; Monteserin, Maria; Tapia, Maria J ABSTRACT The complexation of beta-carboline-3-carboxylic acid N- methylamide (betaCMAM) with the sodium salts of the nucleotides polyadenylic (Poly A), polycytidylic (Poly C), polyguanylic (Poly G), polythymidylic (Poly T) and polyuridylic (Poly U) acids, and with double stranded (dsDNA) and single stranded deoxyribonucleic acids (ssDNA) was studied at pH 4, 6 and 9....

2007-04-15 03:00:25

By Capasso, S; Colella, C; Coppola, E; Iovino, P; Salvestrini, S ABSTRACT: The ability of the natural zeolited Neapolitan Yellow Tuff (NYT) enriched with calcium ions to remove humic acids from water was evaluated by batch adsorption equilibrium tests and dynamic experiments carried out by percolating humic acid solutions through a small NYT column (breakthrough curves). Under the experimental condition explored, the sorption capacity increases with the ionic strength and has the highest...

2006-12-12 03:00:27

By Loi, G; Rossi, A; Trois, P; Rossi, G Abstract Until recently, two types of bioreactors were used for bioleaching: the stirred tank reactor (STR), borrowed from chemical engineering, and the so-called Pachuca tank airlift reactor (ALR), borrowed from hydrometallurgy. These reactors perform very satisfactorily in the fields for which they were developed, but they have a number of major shortcomings when used for bioleaching. These drawbacks stem from the stressful conditions that the...

2005-07-16 16:32:39

New Haven, Conn. -- Free protons from acids associate with 1, 2 or 3 molecules of water and the structures can be identified by unique infrared laser spectrum signatures, according to a report in Science by Yale professor of chemistry Mark A. Johnson and his collaborators at Yale, the University of Pittsburgh and the University of Georgia. Acids yielding free protons are common in biological and chemical systems and the measurement of pH to determine acidity of an aqueous solution is a...

Latest Acid-base chemistry Reference Libraries

Ocean Acidification
2013-04-01 10:32:20

Ocean acidification is the name that was given to the ongoing decrease in the pH of Earth’s oceans, a cause of the uptake of anthropogenic carbon dioxide from the atmosphere. About 30 to 40 percent of the carbon dioxide that is released by humans into the atmosphere dissolves into the lakes, oceans, and rivers. To maintain the chemical equilibrium, some of it reacts with the water to create carbonic acid. Some of these extra carbonic acid molecules react with a water molecule to provide a...

2010-11-15 18:19:11

A pH meter, typically consisting of a special measuring probe connected to an electronic meter, is an electronic instrument used to measure the pH (acidity or alkalinity) of a liquid. The probe measures pH as the hydrogen ion activity that surrounds a thin-walled glass bulb at its tip. A small voltage is produce by the probe that measures and displays pH units by the meter. The meter circuit displays voltmeter in pH units instead of volts. The circuit of the pH meter consists of operational...

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Word of the Day
  • A 'bachelor seal'; a young male seal which is prevented from mating by its herd's older males (mated bulls defending their territory).
This comes from the Russian word for 'bachelors.'