By William R Cullen, Kenneth J Reimer
Arsenic is a clearly taking place aspect and, as such, it really is found in the surroundings and in our foods and drinks. it may also be enthusiastic about helping existence procedures. even though, as a result of its toxicity, there's trouble approximately its presence in our vitamin. This booklet examines the genuine hazards 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 substitute remedies akin to homeopathy. Following on from "Is Arsenic an Aphrodisiac?: The Sociochemistry of an Element", this booklet keeps the authors paintings in addressing the problems surrounding arsenic. it's a attention-grabbing 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?
Surveillance of a 1000 km2 area using satellite-based radar images revealed that intensive groundwater extraction is causing the land to subside (sink) by up to 3 cm per year. This subsidence is causing clay to be compacted, forcing the naturally occurring arsenic from pores in the clay into the groundwater. The buried clay containing arsenic is like a dirty sponge being squeezed. In a related manner, hydraulic fracturing (commonly known as “fracking”) appears to be another way in which groundwater can be contaminated with arsenic.
Part of the challenge in making linkages between exposure to arsenic and disease is that it takes many years for the symptoms of chronic arsenic poisoning to develop. In the period from 1958 to 1971, residents of Antofagasta in northern Chile were exposed to an arsenic concentration of 800 ppb in their drinking water. 8 make the compelling case that, until the 1980s, problems caused by arsenic in drinking water had not attracted much international attention. They give three reasons for this: ●● There was no routine testing for arsenic in many countries; ●● People knew little about the health effects of chronic exposure to lessthan-acute doses of arsenic; and ●● The major health problems in Argentina and Taiwan were poorly known in Europe and North America.
The particles run from the shores into the water body and, after heavy rain, may make the drinking water turbid. The alum causes the particles to clump together and settle out; arsenic also adsorbs to the alum and is thereby removed. As(v) adsorbs to alum more effectively than As(iii), so it may be necessary to add agents to convert (oxidize) the As(iii) to As(v) in a pre-treatment step. Hard water, which has excess calcium and magnesium, is treated (“softened”) using lime (calcium hydroxide). The lime forms a solid to which arsenic adsorbs.