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Mercury retort (Practical Action Technical Brief)
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== How to make and use a simple retort for separating gold-mercury amalgam == Mercury is used in amalgamation to recover gold in its native or 'free' form. While mercury simplifies the process greatly, it must be remembered that it is a very dangerous substance, especially when inhaled or absorbed through the skin. Mercury is an 'accumulative' poison, meaning that repeated exposure, even of very small amounts, can build up in the body, leading eventually to mercury poisoning. Mercury released into the atmosphere is also dangerous because it combines easily with other substances (such as hydrocarbons) to form compounds which can easily be taken up by other organisms, such as fish and shellfish. A build-up of mercury in these organisms can make them dangerous to eat. Signs of serious mercury poisoning include stomach pains, vomiting, headaches, shaking, collapse, diarrhoea and, occasionally, cardiac weakness. Indications of low-Ievel mercury poisoning include nervousness, depression, vague fears, sleeping difficulties, reduced vision and poor co-ordination of the limbs. [[File:mercury retort simple retort.jpg|thumb|150px|right|Figure 1: A Simple Retort]]
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