Andreas Sigismund Marggraf (; 3 March 1709 – 7 August 1782) was a German

chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a graduated scientist trained in the study of chemistry, or an officially enrolled student in the field. Chemists study the composition of ...

from

Berlin Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...

, then capital of the

Margraviate of Brandenburg The Margraviate of Brandenburg () was a major principality of the Holy Roman Empire from 1157 to 1806 that, having electoral status although being quite poor, grew rapidly in importance after inheriting the Duchy of Prussia in 1618 and then came ...

, and a pioneer of

analytical chemistry Analytical skill, Analytical chemistry studies and uses instruments and methods to Separation process, separate, identify, and Quantification (science), quantify matter. In practice, separation, identification or quantification may constitute t ...

. He isolated

zinc Zinc is a chemical element; it has symbol Zn and atomic number 30. It is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodic tabl ...

in 1746 by heating

calamine Calamine, also known as calamine lotion, is a medication made from powdered calamine (mineral), calamine mineral that is used to treat mild itchiness. Conditions treated include sunburn, insect bites, Toxicodendron radicans, poison ivy, poiso ...

and

carbon Carbon () is a chemical element; it has chemical symbol, symbol C and atomic number 6. It is nonmetallic and tetravalence, tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 ...

. Though he was not the first to do so, Marggraf is credited with carefully describing the process and establishing its basic theory. In 1747, Marggraf announced his discovery of

sugar Sugar is the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food. Simple sugars, also called monosaccharides, include glucose Glucose is a sugar with the Chemical formula#Molecular formula, molecul ...

beet The beetroot (British English) or beet (North American English) is the taproot portion of a '' Beta vulgaris'' subsp. ''vulgaris'' plant in the Conditiva Group. The plant is a root vegetable also known as the table beet, garden beet, dinner ...

s and devised a method using alcohol to extract it. His student

Franz Achard Franz Karl Achard (28 April 1753 – 20 April 1821) was a German (Prussian) chemist, geoscientist, physicist, and biologist. His principal discovery was the production of sugar from sugar beets. Life and work Achard was born in Berlin, the so ...

later devised an economical industrial method to extract the sugar in its pure form.

Life

Andreas Sigismund Marggraf was the son of the pharmacist Henning Christian Marggraf (1680–1754), who owned a pharmacy in Berlin and lectured at the Collegium Medico-Chirurgicum (medical/surgical school). Marggraf came in contact with the pharmaceutical and medical business early and started studying at the medical school in 1725. He studied with Caspar Neumann in Berlin, visited pharmacies in other cities, including

Frankfurt am Main Frankfurt am Main () is the most populous city in the States of Germany, German state of Hesse. Its 773,068 inhabitants as of 2022 make it the List of cities in Germany by population, fifth-most populous city in Germany. Located in the forela ...

and

Strasbourg Strasbourg ( , ; ; ) is the Prefectures in France, prefecture and largest city of the Grand Est Regions of France, region of Geography of France, eastern France, in the historic region of Alsace. It is the prefecture of the Bas-Rhin Departmen ...

and attended lectures at the

University of Halle Martin Luther University Halle-Wittenberg (), also referred to as MLU, is a public research university in the cities of Halle and Wittenberg. It is the largest and oldest university in the German state of Saxony-Anhalt. MLU offers German and i ...

. He worked in his father's pharmacy and focused his work on chemistry. In later life he helped to reorganize the Societät der Wissenschaften into the Akademie der Wissenschaften (

Prussian Academy of Science The Royal Prussian Academy of Sciences () was an academy established in Berlin, Germany on 11 July 1700, four years after the Prussian Academy of Arts, or "Arts Academy," to which "Berlin Academy" may also refer. In the 18th century, when French ...

) and became the director of the physics section in 1760. In 1774 he had a

stroke Stroke is a medical condition in which poor cerebral circulation, blood flow to a part of the brain causes cell death. There are two main types of stroke: brain ischemia, ischemic, due to lack of blood flow, and intracranial hemorrhage, hemor ...

, and continued working at the laboratories of the Akademie until his retirement in 1781.

Scientific work

Marggraf introduced several new methods into experimental chemistry. He used

precipitation In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls from clouds due to gravitational pull. The main forms of precipitation include drizzle, rain, rain and snow mixed ("sleet" in Commonwe ...

methods for analysis, such as the

Prussian blue Prussian blue (also known as Berlin blue, Brandenburg blue, Parisian and Paris blue) is a dark blue pigment produced by oxidation of ferrous ferrocyanide salts. It has the chemical formula . It consists of cations, where iron is in the oxidat ...

reaction for the detection of

iron Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...

. Marggraf's major work in inorganic chemistry included the improved production of

phosphorus Phosphorus is a chemical element; it has Chemical symbol, symbol P and atomic number 15. All elemental forms of phosphorus are highly Reactivity (chemistry), reactive and are therefore never found in nature. They can nevertheless be prepared ar ...

from

urine Urine is a liquid by-product of metabolism in humans and many other animals. In placental mammals, urine flows from the Kidney (vertebrates), kidneys through the ureters to the urinary bladder and exits the urethra through the penile meatus (mal ...

and the detection of

alkali metal The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K),The symbols Na and K for sodium and potassium are derived from their Latin names, ''natrium'' and ''kalium''; these are still the origins of the names ...

salts in plant ash and their identification by flame test. Before his 1762 work, (al)chemists didn't systematically distinguish between potassium and sodium salts. His extraction of

from

s, which was then only available from

sugarcane Sugarcane or sugar cane is a species of tall, Perennial plant, perennial grass (in the genus ''Saccharum'', tribe Andropogoneae) that is used for sugar Sugar industry, production. The plants are 2–6 m (6–20 ft) tall with stout, jointed, fib ...

, was the starting point for the

sugar industry The sugar industry subsumes the production, Sugar refinery, processing and marketing of sugars (mostly sucrose and fructose). Globally, about 80% of sugar is extracted from sugar cane, grown predominantly in the tropics, and 20% from sugar beet, ...

in Europe, and the modern sugar industry in the world. Although Marggraf recognized the economic impact of his discovery, he did not pursue it. Marggraf's student

, completed the work and developed an economic extraction method for sugar from

sugar beet A sugar beet is a plant whose root contains a high concentration of sucrose and that is grown commercially for sugar production. In plant breeding, it is known as the Altissima cultivar group of the common beet (''Beta vulgaris''). Together with ...

. Other students of Marggraf included Johann Gottlob Lehmann, Franz Carl Achard and probably

Valentin Rose the Elder Valentin Rose the Elder (16 August 1736 – 28 April 1771) was a German pharmacist and chemist born in Neuruppin. He is remembered for creation of a fusible alloy known as Rose metal, which is composed of lead, bismuth and tin. Beginning in 1761, ...

and

Martin Heinrich Klaproth Martin Heinrich Klaproth (1 December 1743 – 1 January 1817) was a German chemist. He trained and worked for much of his life as an apothecary, moving in later life to the university. His shop became the second-largest apothecary in Berlin, and ...

. He was the first to isolate

glucose Glucose is a sugar with the Chemical formula#Molecular formula, molecular formula , which is often abbreviated as Glc. It is overall the most abundant monosaccharide, a subcategory of carbohydrates. It is mainly made by plants and most algae d ...

from

raisins A raisin is a dried grape. Raisins are produced in many regions of the world and may be eaten raw or used in cooking, baking, and brewing. In the United Kingdom, Ireland, New Zealand, Australia and South Africa, the word ''raisin'' is reserv ...

in 1747.

Isolation of zinc

Marggraf had isolated zinc in 1746 by heating a mixture of

and

in a closed vessel without copper. He was unaware that the same process had been developed (and patented) by William Champion in England around 1738–1740 and by Anton von Swab in Sweden around 1742. However, Marggraf described the process in great detail and established its basic theory, for which he is often credited with isolation of zinc. This procedure became commercially practical by 1752.

References

* {{DEFAULTSORT:Marggraf, Andreas Sigismund 1709 births 1782 deaths 18th-century German chemists Scientists from Berlin People of the Industrial Revolution People from the Margraviate of Brandenburg Members of the Prussian Academy of Sciences Honorary members of the Saint Petersburg Academy of Sciences 18th-century agronomists Chemists from the Kingdom of Prussia Sugar technologists