Search results
Results from the WOW.Com Content Network
Arsenic is the 53rd most abundant element in the Earth's crust, comprising about 1.5 parts per million (0.00015%). [ 43 ] 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. [ 44 ]
First reference to it as a new metal was made by William Brownrigg in 1750. [39] 33 Arsenic: c. AD 300 c. AD 300 Egyptians Middle East The use of metallic arsenic was described by the Egyptian alchemist Zosimos. [40] The purification of arsenic was later described in the works attributed to the Muslim alchemist Jabir ibn Hayyan (c. 850 –950 ...
Tin is an essential metal in the creation of tin- bronzes, and its acquisition was an important part of ancient cultures from the Bronze Age onward. Its use began in the Middle East and the Balkans around 3000 BC. Tin is a relatively rare element in the Earth's crust, with about two parts per million (ppm), compared to iron with 50,000 ppm ...
The history of poison[1] stretches from before 4500 BCE to the present day. Poisons have been used for many purposes across the span of human existence, most commonly as weapons, anti-venoms, and medicines. Poison has been heavily studied in toxicology, among other sciences, and its use has led to several technological innovations.
Arsenic was known to be poisonous during the Victorian era. [103] Beginning in about 3000 BC arsenic was mined and added to copper in the alloying of bronze, but the adverse health effects of working with arsenic led to it being abandoned when a viable alternative, tin, was discovered. [104]
Carl Wilhelm Scheele. Carl Wilhelm Scheele (German: [ˈʃeːlə], Swedish: [ˈɧêːlɛ]; 9 December 1742 – 21 May 1786 [2]) was a German Swedish [3] pharmaceutical chemist. Scheele discovered oxygen (although Joseph Priestley published his findings first), and identified molybdenum, tungsten, barium, nitrogen, and chlorine, among others.
The Marsh test is a highly sensitive method in the detection of arsenic, especially useful in the field of forensic toxicology when arsenic was used as a poison. It was developed by the chemist James Marsh and first published in 1836. [1] The method continued to be used, with improvements, in forensic toxicology until the 1970s. [2] Arsenic, in ...
An additional 133,500 cases of apple juice have been recalled due to arsenic concerns, according to the Food and Drug Administration (FDA). The affected products were sold at Walmart, Walgreens ...