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Last updated on April 17, 2014 at 16:36 EDT

Latest Ph Stories

2008-08-10 00:00:12

Part of a river which has turned bright green should return to normal over the weekend. The Environment Agency is investigating after the River Trent, in Stone, changed colour late on Wednesday. It is believed a quantity of water-based dye got into the river, possibly upstream in the Stoke-on-Trent or Newcastle area. Tests found the substance to be harmless. An Environment Agency spokesman said: "We have measured dissolved oxygen, pneumonia and PH levels of the water and found nothing...

2008-08-09 03:00:24

By Lapointe, Mathieu MacKenzie, Tyler D B; Morse, David The oceans globally constitute an important sink for carbon dioxide (CO2) due to phytoplankton photosynthesis. However, the marine environment imposes serious restraints to carbon fixation. First, the equilibrium between CO2 and bicarbonate (HCO^sub 3^-) is pH dependent, and, in normal, slightly alkaline seawater, [CO2] is typically low (approximately 10 mM ). Second, the rate of CO2 diffusion in seawater is slow, so, for any cells...

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2008-07-31 15:16:26

Decreasing pH the biggest threat to marine animal life for thousands of years By absorbing carbon dioxide from the atmosphere, and from the human use of fossil fuels, the world's seas function as a giant buffer for the Earth's life support system. The chemical balance of the sea has long been regarded as immovable. Today, researchers know that the pH of the sea's surface water has gone down by 0.1, or 25 percent, just since the beginning of industrialization just over a century ago. Jon...

2008-07-29 12:00:49

By Niki Sullivan, The News Tribune, Tacoma, Wash. Jul. 29--A faulty batch of chemicals might have caused the pH level of Wapato Lake to plummet during an algae treatment Friday, suffocating large numbers of fish, according to the company hired to monitor water quality. Rob Plotnikoff, a senior scientist with Seattle water monitoring company Tetra Tech, told the Metro Parks board of commissioners Monday that the lake is safe now, but they'll have to wait for more information -- including...

2008-07-11 00:00:00

By STUART ABEL Herald Reporter Owners of ornamental fish in Plymouth have been put on alert after a change in the tap water was blamed for the death of several valuable carp. One man lost five carp in his pond within two weeks - and he is claiming that a rise in the pH level of the water is the cause. Ponds are mostly refilled, from the tap but if the water becomes too alkaline or acidic fish can be harmed. Now the owner of a tropical fish store has warned owners to test the pH levels...

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...

2008-02-09 03:00:22

By Chow, Judith C Doraiswamy, Prakash; Watson, John G; Chen, L-W Antony; Ho, Steven Sai Hang; Sodeman, David A ABSTRACT Recent improvements in integrated and continuous PM^sub 2.5^ mass and chemical measurements from the Supersite program and related studies in the past decade are summarized. Analytical capabilities of the measurement methods, including accuracy, precision, interferences, minimum detectable levels, comparability, and data completeness are documented. Upstream denuders...

2007-12-28 06:00:24

By Amuda, Omotayo Sarafadeen Ojo, Olumuyiwa Idowu; Edewor, Theresa Ibibia ABSTRACT The shell of the seed of Chrysophyllum albidum carbon was used to adsorb lead (Pb) from aqueous solution, the sorption process with respect to its equilibria and kinetics as well as the effects of pH, contact time, adsorbent mass, adsorbate concentration, and particle size on adsorption were also studied. The most effective pH range was found to be between 4.5 and 5 for the sorption of the metal ion. The...

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....