Download Arsenic is everywhere: cause for concern? by William R Cullen, Kenneth J Reimer PDF

By William R Cullen, Kenneth J Reimer

Arsenic is a evidently happening aspect and, as such, it really is found in the surroundings and in our foods and drinks. it could also be enthusiastic about assisting lifestyles techniques. notwithstanding, because of its toxicity, there's crisis approximately its presence in our vitamin. This booklet examines the genuine hazards and affects of arsenic in our lives. taking a look at arsenic and its compounds, this booklet 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 to be on the use of arsenic in medication, from melanoma remedies to substitute cures 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 attention-grabbing learn for normal readers because it unveils the truth of our publicity to arsenic in our day-by-day lives

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Example text

The three states of water—ice, liquid water and steam—are a familiar example. Water’s physical states can be converted from one to another by heating or cooling. This makes physical changes different from chemical ones. Heating iron in air yields the brown, crumbly material we know as rust; this is a chemical process and cooling will not reverse it. Just like water, individual arsenic compounds may be in solid, liquid or gas form, depending on their properties and on temperature and the pressure they are under.

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.

Suspending very small water droplets in air gives a heterogeneous mixture (more than one phase); fog, which consists of water droplets suspended in (mixed with) air, is an example of this sort of mixture (an aerosol). In the atmosphere, arsenic can be dispersed as solid particles of various sizes, such as wind-blown dust containing arsenic minerals. Alternatively, the arsenic compounds may leave the Earth’s surface as gases and then adsorb to very fine solid particles or be dissolved in small water droplets.

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