Performing the Marsh Test, 1856
Numéro d’image : 12631338
| Performing the Marsh Test, 1856. Doctor Alfred Swaine Taylor (left) and a colleague, performing the Marsh test on samples taken from the body of John Parsons Cook. The two were looking for traces of arsenic and antimony. The Marsh test is a method for the detection of minute amounts of arsenic in foods (the residue of fruit spray) or in stomach contents. The sample is placed in a flask with arsenic-free zinc and sulfuric acid. Arsine gas (also hydrogen) forms and is led through a drying tube to a hard glass tube in which it is heated. The arsenic is deposited as a mirror just beyond the heated area and on any cold surface held in the burning gas emanating from the jet. Antimony gives a similar test, but the deposit is insoluble in sodium hypochlorite, whereas arsenic will dissolve. The test was named for its inventor, the English chemist James Marsh. | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Science Source |
| Taille de l’image : | 3600 px × 2802 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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Mots clés
- 1856,
- 19ème siècle,
- A. TAYLOR,
- A.S. TAYLOR,
- acide sulfurique,
- ALFRED S. TAYLOR,
- ALFRED SWAINE TAYLOR,
- ALFRED TAYLOR,
- amélioration,
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- hydrogène,
- hypochlorite de sodium,
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- illustration,
- insoluble,
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- JAMES MARSH,
- JOHN PARSONS COOK,
- juridique,
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- XIXème siècle