Johan Gadolin

Johan Gadolin was born in Åbo (Finnish name Turku), Finland (then a part of Sweden).{{cite book |last1=Weeks |first1=Mary Elvira |title=The discovery of the elements |date=1956 |publisher=Journal of Chemical Education |location=Easton, PA |url=https://archive.org/details/discoveryoftheel002045mbp |edition=6th }}{{cite journal | author = Weeks, Mary Elvira |author-link=Mary Elvira Weeks| title = The discovery of the elements: XVI. The rare earth elements | journal = Journal of Chemical Education | year = 1932 | volume = 9 | issue = 10 | pages = 1751–1773 | doi = 10.1021/ed009p1751 | bibcode=1932JChEd...9.1751W}} Johan was the son of Jakob Gadolin, professor of physics and theology at Åbo. Johan began to study mathematics at the Royal Academy of Turku (Åbo Kungliga Akademi) when he was fifteen. Later he changed his major to chemistry, studying with Pehr Adrian Gadd, the first chair of chemistry at Åbo.

In 1779 Gadolin moved to Uppsala University. In 1781, he published his dissertation Dissertatio chemica de analysi ferri ("Chemical dissertation on the analysis of iron"), under the direction of Torbern Bergman.{{cite book|last1=Gadolin|first1=Johan|last2=Bergman|first2=Torbern|title=Dissertatio chemica de analysi ferri, quam, venia ampliss. facult. philos., praeside Torb. Bergman [...] publice ventilandam sistit Johannes Gadolin, aboa-fenno. In auditorio gustaviano majori d. 9 jun. anno 1781|date=1781|publisher=Edman|location=Uppsala}}{{cite journal|last1=Marshall |first1=James L. |last2=Marshall |first2=Virginia R. |title=Rediscovery of the Elements: Yttrium and Johan Gadolin |journal=The Hexagon |url=http://www.chem.unt.edu/~jimm/REDISCOVERY%207-09-2018/Hexagon%20Articles/gadolin.pdf |date=2008|issue=Spring|pages=8–11}}{{cite journal | author = Sella, Andrea | title = Gadolin's Condenser | journal = Chemistry World | year = 2009 | volume = 6 | issue = 10 | pages = 81 | url = http://www.rsc.org/chemistryworld/Issues/2009/October/Gadolinsscondenser.asp}} Bergman founded an important research school, and many of his students, including Gadolin, Johan Gottlieb Gahn, and Carl Wilhelm Scheele, became close friends.{{cite book|last1=Good|first1=John Mason|last2=Gregory|first2=Olinthus|last3=Bosworth|first3=Newton|title=Pantologia A new cabinet cyclopaedia, comprehending a complete series of essays, treatises, and systems, alphabetically arranged; with a general dictionary of arts, sciences, and words|date=1819|publisher=J. Walker|location=London|isbn=1179565665|chapter=Scheele (Charles William)|chapter-url=https://books.google.com/books?id=lNSzxLSFzu0C&pg=PT467|access-date=31 March 2015}}{{cite book|last1=Authier|first1=Andre|title=Early Days of X-ray Crystallography|date=2013|publisher=Oxford University Press|location=Oxford|isbn=978-0199659845|page=309|url=https://books.google.com/books?id=NC6_4yip49MC&pg=PA309|access-date=31 March 2015}}

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Gadolin was fluent in Latin, Finnish, Russian, German, English and French in addition to his native Swedish. He was a candidate for the chair of chemistry at Uppsala in 1784, but Johann Afzelius was selected instead. Gadolin became an extraordinary professor at Åbo in 1785 (an unpaid position). Beginning in 1786, he made a chemical "grand tour" of Europe, visiting universities and mines in various countries. He worked with Lorenz Crell, editor of the journal Chemische Annalen in Germany, and with Adair Crawford and Richard Kirwan in Ireland.{{cite book|last1=Alho|first1=Olli|title=Finland: A Cultural Encyclopedia|date=1997|publisher=Finnish Academy of Science & Letters|isbn=978-9517178853|url=http://www.chemistryexplained.com/Fe-Ge/Gadolin-Johang.html|access-date=1 April 2015}}

Gadolin was elected a member of the Royal Swedish Academy of Sciences in 1790.

Gadolin became the ordinary professor of chemistry at the Royal Academy of Turku in 1797,{{cite journal

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|title=Sir Johan Gadolin of Turku: the grandfather of gadolinium.

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|doi=10.1016/S1076-6332(96)80523-X

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}} after the death of Pehr Adrian Gadd. He retained the position until his retirement in 1822. He was one of the first chemists who gave laboratory exercises to students. He even allowed the students to use his private laboratory.

Gadolin made contributions in a variety of areas.

Although he never visited France, he became a proponent of Antoine Lavoisier's theory of combustion. Gadolin's Inledning till Chemien (1798) was the first chemistry textbook in the Nordic countries that questioned the theory of phlogiston and discussed the role of oxygen in combustion in a modern way.{{cite book|last1=Enghag|first1=Per|title=Encyclopedia of the elements: technical data, history, processing, applications|date=2004|publisher=Wiley-VCH|location=Weinheim|isbn=978-3527306664|page=437|edition=1st reprint.|url=https://books.google.com/books?id=fUmTX8yKU4gC&pg=PA437}}

Gadolin studied the relationship of heat to chemical changes, in particular, the ability of different substances to absorb heat (specific heat) and the absorption of heat during state changes (latent heat).{{cite book|last1=Burns|first1=William E.|title=Science in the Enlightenment: An Encyclopedia|date=2003|publisher=ABC-CLIO|location=Santa Barbara|isbn=978-1576078860|pages=122–123|url=https://books.google.com/books?id=4H9_Zvp80nAC&pg=PA122|access-date=1 April 2015}} This thermochemical work required extremely precise measurements.{{cite book|last1=Heilbron|first1=J.L.|title=AbeBooks Elements of Early Modern Physics|date=1982|publisher=University of California Press|location=Berkeley|isbn=978-0520045552|page=79|url=https://books.google.com/books?id=vBH0vBmG61IC&pg=PA79|access-date=31 March 2015}} Gadolin published important papers on specific heat by 1784, and on the latent heat of steam in 1791. He demonstrated that the heat of ice was equal to the heat of snow, and published a standard set of heat tables.{{cite book|editor-last1=Daintith|editor-first1=John|editor-last2=Tootill|editor-first2=E.|editor-last3=Gjertsen|editor-first3=D.|title=Biographical Encyclopedia of Scientists|date=1994|publisher=CRC Press|isbn=0750302879|page=324|edition=2nd|url=https://books.google.com/books?id=QhjRFox0mKYC&pg=PA324}}

{{quote|The best series of experiments on the distribution of heat among different bodies was performed before the year 1784 by Professor Gadolin of Åbo, who, rejecting the notion of Capacity, introduced the unexceptionable expression, Specific Heat. One of the most beautiful consequences derived from this theory, was the determination of the absolute zero or lowest point in the scale of Heat.{{cite book|last1=Black|first1=Adam|last2=Black|first2=Charles|title=The Encyclopædia Britannica, Or, Dictionary of Arts, Sciences, and General Literature|date=1842|publisher=Adam and Charles Black|location=Edinburgh|page=645|url=https://books.google.com/books?id=ik40AQAAMAAJ&pg=PA645|access-date=1 April 2015}}}}

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Gadolin became famous for his description of the first rare-earth element, yttrium. In 1792 Gadolin received a sample of black, heavy mineral found in a quarry in a Swedish village Ytterby near Stockholm by Carl Axel Arrhenius.{{cite book | author = Pyykkö, Pekka and Orama, Olli | chapter = What did Johan Gadolin actually do? | title = Episodes from the History of the Rare Earth Elements|editor-last=Evans |editor-first=C. H.|publisher= Kluwer|location= Dordrecht | year = 1996 | pages = 1–12 |chapter-url=http://www.chem.helsinki.fi/~pyykko/pekka/Gadolin_96_2.pdf }} By careful experiments, Gadolin determined that approximately 38% of the sample was a previously unknown "earth", an oxide which was later named yttria.{{cite book|last1=Moeller|first1=Therald|title=The Chemistry of the Lanthanides|date=2013|publisher=Pergamon|pages=39–44|url=https://books.google.com/books?id=dkr-BAAAQBAJ&pg=PA41|access-date=10 March 2015|isbn=978-1483187631}} Yttria, or yttrium oxide, was the first known rare-earth metal compound—at that time, it was not yet regarded as an element in the modern sense. His work was published in 1794.{{cite journal

|first= Johan

|last = Gadolin

|author-link = Johan Gadolin

|title = Undersökning af en svart tung Stenart ifrån Ytterby Stenbrott i Roslagen

|journal = Kongl. Vetenskaps Academiens Nya Handlingar

|volume = 15

|year= 1794

|pages= 137–155

}}

The mineral that Gadolin examined was named gadolinite in 1800.{{cite book|last1=Forsyth|first1=Maria|last2=Hinton|first2=Bruce|title=Rare Earth-Based Corrosion Inhibitors|date=2014|publisher=Woodhead Publishing|isbn=978-0857093479|page=4|url=https://books.google.com/books?id=MLU8AwAAQBAJ&pg=PA4|access-date=31 March 2015}} The element gadolinium and its oxide gadolinia were named after Gadolin by its discoverers.{{cite web|title=Gadolinium|url=http://periodic.lanl.gov/64.shtml|website=Periodic Table of Elements: LANL|access-date=31 March 2015}}

In an earlier paper in 1788 Gadolin showed that the same element can show several oxidation states, in his case Sn(II) and Sn(IV) 'by combining itself with larger or smaller amounts of the calcinating substance'.{{cite journal |author1=Pyykkö, Pekka |author2=Orama, Olli | title = Johan Gadolin's 1788 paper mentioning the several oxidation states of tin and their disproportionation reaction | journal = New J. Chem. | year = 1988 | volume = 12 | pages = 881–883 }} He described the disproportionation reaction:

:2 Sn(II) {{eqm}} Sn(0) + Sn(IV).

File:Johan Gadolin 1960 first day cover 6q182k40p.tiff

Having established the composition of Prussian blue, Gadolin suggested a method for precipitating ferrous iron as ferro ferricyanide, preceding the work of Gay-Lussac by forty years.

Reports of many of Gadolin's chemical investigations appeared in German in Crell's Chemische Annalen für die Freunde der Naturlehre, Arzneygelahrheit, Haushaltungskeit und Manufacturen. In 1825 he published Systema fossilium analysibus chemicis examinatorum secundum partium constitutivarum rationes ordinatorium, a system of mineral classification based upon chemical principles. The introduction outlines Gadolin's theories, and the text presents mineral species in a systematic ordering.{{cite web|title=GADOLIN, Johan|url=http://www.minrec.org/libdetail.asp?id=427|website=The Mineralogical Record, Inc.|access-date=1 April 2015}}

One of Gadolin's latest studies was the chemical analysis of the Chinese alloy pak tong in 1810 and 1827.{{cite journal|last1=Gadolin|first1=Johanne|title=Observationes de Cupro Albo Chinensium, Pe-tong, vel Pack-tong|journal=Nova Acta Regiae Societatis Scientiarum Upsaliensis|date=1827|volume=9|pages=137–|url=https://books.google.com/books?id=-xpDAQAAMAAJ&pg=PA137|access-date=31 March 2015}} Also known as alpacca or German silver, it was a less expensive silver substitute often containing copper, zinc, nickel, and tin.{{cite web|last1=Wiggins|first1=Pamela|title=What are Nickel Silver, German Silver and Alpaca?|url=http://antiques.about.com/od/markssignatures/a/NickelSilverAlpaca.htm|website=About Home|access-date=1 April 2015|archive-date=3 April 2015|archive-url=https://web.archive.org/web/20150403044528/http://antiques.about.com/od/markssignatures/a/NickelSilverAlpaca.htm|url-status=dead}}

Gadolin is also famous for publishing one of the earliest examples of counter-current condensers. In 1791 he improved a condenser design of his father's by using the "counter-current principle". By requiring water coolant to flow uphill, the effectiveness of the condenser was increased. This principle was later used by Justus Liebig, in what is today usually referred to as a Liebig condenser.{{cite journal|title=Finland's most famous chemist|journal=The Pharmaceutical Journal|date=4 June 2010|url=http://www.pharmaceutical-journal.com/opinion/blogs/finlands-most-famous-chemist/11013112.blog|access-date=1 April 2015|archive-date=24 September 2015|archive-url=https://web.archive.org/web/20150924072349/http://www.pharmaceutical-journal.com/opinion/blogs/finlands-most-famous-chemist/11013112.blog|url-status=dead}}

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Gadolin was knighted and is registered under number 245 in the Finnish House of Nobility. He was also awarded the Order of Saint Vladimir and the Order of Saint Anna. His heraldic device was:

Argent, on a bend Azure with two mullets Or between a rose Gules and crystals Proper.{{cite web|title=Johan Gadolin (1760–1852)|url=http://www.numericana.com/arms/gadolin.htm|website=Escutcheons of Science|access-date=1 April 2015}}

Johan Gadolin married first, at age 35, Hedvig Tihleman, with whom he had nine children. After his wife's death he married, at age 59, Ebba Palander. Gadolin retired as professor emeritus in 1822 at age 62, a mandatory age of retirement. He moved to a country estate where he lived for another 30 years. He died in Mynämäki, Finland on 15 August 1852.{{cite book|last1=Kopperl|first1=Sheldon J.|title=Complete dictionary of scientific biography|date=2008|publisher=Charles Scribner's Sons|location=Detroit, MI|isbn=978-0684313207|edition=Gadolin, Johan|url=https://archive.org/details/newdictionaryofs08koer|access-date=31 March 2015|url-access=registration}}

The Great Fire of Turku of 1827 started in a bakery and damaged or destroyed much of the town of Åbo. Gadolin's laboratory and collection of minerals near the cathedral were destroyed.

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Category:1760 births

Category:1852 deaths

Category:18th-century chemists

Category:18th-century Finnish physicists

Category:19th-century chemists

Category:19th-century Finnish scientists

Category:Corresponding members of the Saint Petersburg Academy of Sciences

Category:Discoverers of chemical elements

Category:Finnish chemists

Category:Finnish geologists

Category:Finnish mineralogists

Category:Members of the Royal Swedish Academy of Sciences

Category:Scientists from Turku

Category:Rare earth scientists

Category:Swedish-speaking Finns

Category:Uppsala University alumni

Category:Physicists from the Russian Empire