By William R Cullen, Kenneth J Reimer
ISBN-10: 1782623140
ISBN-13: 9781782623144
ISBN-10: 1782626638
ISBN-13: 9781782626633
ISBN-10: 178262984X
ISBN-13: 9781782629849
Arsenic is a certainly taking place point and, as such, it really is found in the surroundings and in our food and drinks. it may also be fascinated by helping existence approaches. even if, as a result of its toxicity, there's main issue approximately its presence in our nutrition. This booklet examines the genuine dangers and affects of arsenic in our lives. arsenic and its compounds, this e-book explores the presence of arsenic in nutrition and water, the necessity to make clear its toxicity, and present clinical and public misconceptions approximately arsenic. It additionally seems on the use of arsenic in drugs, from melanoma remedies to replacement treatments corresponding to homeopathy. Following on from "Is Arsenic an Aphrodisiac?: The Sociochemistry of an Element", this e-book maintains the authors paintings in addressing the problems surrounding arsenic. it's a interesting learn for common readers because it unveils the truth of our publicity to arsenic in our day-by-day lives
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Additional info for Arsenic is everywhere: cause for concern?
Example text
All of these adsorption techniques work well, but their efficiency can be limited by the presence of other water constituents. If the initial arsenic concentration is very high, it may be quite difficult to achieve the 10 ppb goal. Ion exchange is a process that uses a resin to capture an undesirable substance; many people may recognize this process, as it is used in water softeners, to remove calcium and magnesium. The hard water is passed through a column containing the resin, and the positively charged calcium and magnesium (as Ca2+ and Mg2+) replace sodium or hydrogen (Na+ or H+) on the resin.
In water bodies that are more alkaline (have a higher pH) as a result of mineral weathering and the effect of evaporation in arid or semi-arid regions, the arsenic can desorb (be released) from the iron oxide particle surfaces. 2 Geothermal water (water heated by and emerging from the Earth’s interior) is another source of arsenic to groundwater. This hot water rises from deep, sometimes volcanic regions and may leach arsenic from the rocks it passes through before mixing with surface water and groundwater of non-geothermal origin.
Low oxygen levels (anaerobic conditions), which can be found in some groundwater and at the bottom of very deep lakes, result in the transformation (reduction) of As(v) to As(iii), a process that can be reversed with the reintroduction of oxygen. Several factors, including the action of microorganisms, can influence the ratio of As(v) to As(iii) in water. 2 F actors Influencing the Concentration of Arsenic in Water As we have seen, arsenic is distributed widely in rocks and soils, but its concentration in water varies a great deal, and cases of very high values are relatively rare.
Arsenic is everywhere: cause for concern? by William R Cullen, Kenneth J Reimer
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