Martin Heinrich Klaproth
German chemist who discovered uranium and zirconium.
Martin Heinrich Klaproth (1743–1817) was a German chemist who spent most of his career as an apothecary before moving into academia. Born in Wernigerode, the son of a tailor, he attended the local Latin school for four years. At sixteen he began an apprenticeship in Quedlinburg, later training in pharmacies in Hanover, Berlin, and Danzig. In 1771 he returned to Berlin to manage the business of Valentin Rose the Elder, and after Rose’s death he passed examinations to become senior manager. Following his marriage in 1780, he purchased his own establishment, the Apotheke zum Baren. Between 1782 and 1800 he published eighty-four papers based on research conducted in its laboratory, making his shop the second-largest apothecary in Berlin and the most productive artisanal chemical research center in Europe. He also served as assessor of pharmacy for the examining board of the Ober-Collegium Medicum from 1782, and in 1787 became lecturer in chemistry to the Prussian Royal Artillery. In 1788 he joined the Berlin Academy of Sciences as an unsalaried member, becoming its salaried director in 1800. He then sold the apothecary and convinced the university to build a new laboratory, moving his equipment there upon its completion in 1802. When the University of Berlin was founded in 1810, he was selected as professor of chemistry. Klaproth was a major systematizer of analytical chemistry and an independent inventor of gravimetric analysis. His meticulous attention to detail and refusal to overlook discrepancies in results led to improvements in apparatus use. He discovered uranium and zirconium in 1789, and was involved in the discovery or co-discovery of titanium (1795), strontium (1793), cerium (1803), and chromium (1797), while also confirming tellurium and beryllium (both 1798). He was recognized internationally by the Royal Society, the Institut de France, and the Royal Swedish Academy of Sciences. He died in Berlin on New Year’s Day 1817.
- known_for
- Discovery of uranium (from pitchblende) and zirconium; systematizing analytical chemistry
Lore & Background
Martin Heinrich Klaproth was born in Wernigerode, the son of a tailor, and attended the local Latin school for four years. He began his career as an apothecary, apprenticing at age sixteen and later working in pharmacies across several German cities. After the death of his employer Valentin Rose the Elder in Berlin, Klaproth passed the required examinations to become senior manager of the business. He eventually purchased his own establishment, the Apotheke zum Baren, which grew into the second-largest apothecary in Berlin and the most productive artisanal chemical research center in Europe. From this laboratory, he published dozens of papers. Klaproth was an exact and conscientious worker who greatly improved and systematized analytical chemistry, becoming an early adherent of quantitative methods and an independent inventor of gravimetric analysis. His refusal to ignore discrepancies in results led to better use of apparatus. He discovered uranium and zirconium in 1789, though he could not isolate them as pure metals. He also verified the presence of titanium in a Hungarian rutile ore in 1795, suggesting its name, and was involved in the discovery or confirmation of strontium, cerium, chromium, tellurium, and beryllium. Later in life, he sold his apothecary and moved to the Berlin Academy of Sciences, where he became its salaried director and convinced the university to build a new laboratory. When the University of Berlin was founded in 1810, he was selected as its professor of chemistry. He died in Berlin on New Year’s Day, 1817.
Reader's Guide
Klaproth's significance lies in his systematic approach to analytical chemistry and mineralogy. He was an exact and conscientious worker who did much to improve and systematize the processes of analytical chemistry and mineralogy. His appreciation of the value of quantitative methods led him to become one of the earliest adherents of the Lavoisierian doctrines outside France. Though he characterized uranium and zirconium as distinct elements, he was unable to isolate them. He clarified the composition of numerous substances imperfectly known, including compounds of tellurium, strontium, and chromium.
Did You Know?
- Klaproth was a member and director of the Berlin Academy of Sciences, and a foreign member of the Royal Swedish Academy of Sciences and the Institut de France.
Frequently Asked Questions
What elements did Klaproth discover?
Klaproth identified both uranium, which he isolated from pitchblende ore, and zirconium. These two additions to the known elements remain his most celebrated scientific contributions.
How did Klaproth train and build his career?
Rather than following a purely academic route, he trained as an apothecary and ran his own shop, which he converted into a serious artisanal research center. He only moved into a university role in his later years.
Why is Klaproth important to the history of analytical chemistry?
He is widely regarded as a key systematizer of analytical chemistry, establishing rigorous, reproducible procedures that elevated the field from a loose craft to a disciplined science. His insistence on careful methodology influenced generations of chemists who followed.
What made Klaproth's experimental approach stand out?
He was famous for his meticulous attention to detail and for refusing to brush aside any discrepancy or anomaly in his results. Rather than discarding inconvenient data, he treated every inconsistency as a clue worth investigating further.
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