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The Marsh test treats the sample with sulfuric acid and arsenic-free zinc. Even if there are minute amounts of arsenic present, the zinc reduces the trivalent arsenic (As 3+). Here are the two half-reactions: Oxidation: Zn → Zn 2+ + 2 e − Reduction: As 2 O 3 + 12 e − + 6 H + → 2 As 3− + 3 H 2 O. Overall, we have this reaction:
Typical background concentrations of arsenic do not exceed 3 ng/m 3 in the atmosphere; 100 mg/kg in soil; 400 μg/kg in vegetation; 10 μg/L in freshwater and 1.5 μg/L in seawater. [49] Arsenic is the 22nd most abundant element in seawater [ 50 ] and ranks 41st in abundance in the universe.
James Marsh (2 September 1794 – 21 June 1846) was a British chemist who invented the Marsh test for detecting arsenic. Born in Kent, he was working as a labourer in Woolwich in the late 1810s and early 1820s, before joining the Royal Artillery. [1] He was married to Mary, and had four children, two of whom died in infancy. [2]
The Poison Book Project is a project of the Winterthur Museum, Garden and Library and the University of Delaware to identify and catalog books known to contain poisonous substances, particularly arsenic in Paris green pigments. It was started in 2019 when Winterthur staff members Melissa Tedone and Rosie Grayburn identified a book containing ...
The First Book of Samuel, otherwise called the First Book of the Kings 2 Samuel: 2 Samuelis also known as 2 Regum: 2 Kings: The Second Book of Samuel, otherwise called the Second Book of the Kings 1 Kings: 3 Regum: 3 Kings: The First Book of the Kings, commonly called the Third Book of the Kings 2 Kings: 4 Regum: 4 Kings
John Speed's Genealogies recorded in the Sacred Scriptures (1611), bound into first King James Bible in quarto size (1612). The title of the first edition of the translation, in Early Modern English, was "THE HOLY BIBLE, Conteyning the Old Teſtament, AND THE NEW: Newly Tranſlated out of the Originall tongues: & with the former Tranſlations diligently compared and reuiſed, by his Maiesties ...
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James Maybrick (24 October 1838 – 11 May 1889) was a Liverpool cotton merchant. After his death, his wife, Florence Maybrick , was convicted of murdering him by poisoning in a sensational trial. The " Aigburth Poisoning" case was widely reported in the press on both sides of the Atlantic .