Monday, July 28, 2014

Review: The History of Chemistry Vol. 2


The History of Chemistry Vol. 2
The History of Chemistry Vol. 2 by Thomas Thomson

My rating: 0 of 5 stars



Paracelsus legacy. Chemists know how to prepare drugs, physicians know to prescribe drugs and pharmacists know to sel. From this point we have now an pinpoint image of the development status of main powers in Europe.



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Saturday, July 26, 2014

Review: Guidelines for Drinking-Water Quality


Guidelines for Drinking-Water Quality
Guidelines for Drinking-Water Quality by World Health Organization

My rating: 0 of 5 stars



"The UN General Assembly declared the period from 2005 to 2015 as the International Decade for Action,
“Water for Life”.
Most recently, the UN General Assembly declared safe and clean
drinking-water and sanitation a human right essential to the full enjoyment of life and all other human rights. Access to safe drinking-water is important as a health and development issue at national, regional and local levels. In some regions, it has been shown that investments in water supply and sanitation can yield a net economic benefit, as the reductions in adverse health effects and health-care costs outweigh the costs of undertaking the interventions. This is true for investments ranging from major water supply infrastructure through to water treatment in the home. Experience has also shown that interventions in improving access to safe water favour the poor in particular, whether in rural or urban areas, and can be an effective part of poverty alleviation strategies.
The World Health Organization (WHO) published three editions of the Guidelines
for drinking-water quality in 1983–1984, 1993–1997 and 2004, as successors to
previous WHO International standards for drinking water, published in 1958, 1963 and 1971. From 1995, the Guidelines have been kept up to date through a process of rolling revision, which leads to the regular publication of addenda that may add to or supersede information in previous volumes as well as expert reviews on key issues preparatory to the development of the Guidelines.
Leading the process of the development of the fourth edition was the Water, Sanitation..." (XV)
An old tradition here is telling us "some springs make girls beautiful". Enjoy!



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Review: Guidelines for Drinking-Water Quality


Guidelines for Drinking-Water Quality
Guidelines for Drinking-Water Quality by World Health Organization

My rating: 5 of 5 stars



History of guideline development
The 1958, 1963 and 1971 WHO International Standards for Drinking-water and the first edition of the Guidelines for Drinking-water Quality, published in 1984, did not refer to chlorine. The 1993 Guidelines established a guideline value of 5mg/liter for free chlorine in drinking-water, but noted that this value is conservative, as no adverse effect level was identified in the study used. It was also noted that most individuals are able to taste chlorine at the guideline value.(pg. 326)
Well, chlorine save more lives than all other drugs discovered after aspirin. Until now, so we have to do more work.
Great and continuous job here.
Think a moment: access at potable water is a fundamental human right.



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