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Marsh Test Apparatus, 1867

Marsh Test Apparatus, Steel engraving, 1867. 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.
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Title:
Marsh Test Apparatus, 1867
Caption:
Marsh Test Apparatus, Steel engraving, 1867. 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.
Credit:
Album / Science Source
Releases:
Model: No - Property: No
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Image size:
3000 x 3138 px | 26.9 MB
Print size:
25.4 x 26.6 cm | 10.0 x 10.5 in (300 dpi)
Keywords:
1867 • 19TH CENTURY • ACID • AMOUNT • ANTIMONY • APPARATUS • ARSENIC • ARSENIC-FREE • ARSINE • ART • ARTWORK • BURNING • CENTURY • CHEMISTRY • COLD • COLOR • COLOUR • DEPOSITED • DETECTION • DIAGRAM • DRAWING • DRYING • ENGRAVING • ENHANCE • ENHANCEMENT • FLASK • FORENSIC • GAS • GLASS • HARD • HEATED • HISTORICAL • HISTORY • HYDROGEN • HYPOCHLORITE • ILLUSTRATION • INSOLUBLE • INVENTION • JAMES • MARSH • MEDICAL EXAMINER • METHOD • RESEARCH • SODIUM • SULFURIC • SURFACE • TECHNIQUE • TEST • TOXICOLOGY • TRACÉ • TUBE • ZINC