Chemistry Nexus
by WebElements: the periodic table on the web
Manganese blocks hydrogen sulphide in water systems
Trace amounts of manganese is essential to human health. Now, a team of scientists from the University of Delaware, Scripps Institution of Oceanography, the University of Hawaii, and Oregon Health and Science University has found that a dissolved form of manganese, Mn(III), is important in waterways such as the Black Sea and Chesapeake Bay. It can keep toxic hydrogen sulfide (sulphide) zones in check.
WebElements September 26th, 2006
Posted In: Chemistry, Environmental chemistry
Water on Mars
A NASA press release claims that the Opportunity rover “has demonstrated some rocks on Mars probably formed as deposits at the bottom of a body of gently flowing saltwater.”
“Bedding patterns in some finely layered rocks indicate the sand-sized grains of sediment that eventually bonded together were shaped into ripples by water at least five centimeters (two inches) deep, possibly much deeper, and flowing at a speed of 10 to 50 centimeters (four to 20 inches) per second,” said Dr.
WebElements March 23rd, 2004
Posted In: Atmospheric chemistry, Chemistry
Sequel to an Essay on the Constitution of the Atmosphere
Sequel to an Essay on the Constitution of the Atmosphere, Published in the Philosophical Transactions for 1826; With Some Account of the Sulphurets of Lime1.
This article was published in 1837 by John Dalton and is made available by The Royal Society because of its great historical significance. It makes interesting reading.
References
WebElements June 6th, 1837
Posted In: Atmospheric chemistry, Chemistry, History of chemistry
Tags: John Dalton
On the Constitution of the Atmosphere
This historical document “On the Constitution of the Atmosphere” by John Dalton was presented to the Royal Society in March 1826.1
This is an interesting read for anyone and thanks to the Royal Society for its service that makes these documents available to all.
References
WebElements February 24th, 1826
Posted In: Atmospheric chemistry, Chemistry, History of chemistry
Tags: air, John Dalton, Nitrogen, Oxygen