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236:. From 1891 till his retirement in 1905, he served as director of the second chemical institute of the Berlin University. There he worked on three major problems: (i) relation between the melting point and molecular weight, (ii) effect of crystallinity on the optical rotation and (iii) change in weight during chemical reactions. The negative result for the last experiments was regarded as an accurate experimental confirmation of the conservation laws of mass and energy.
188:. In the same year he became a lecturer in chemistry on the strength of his monograph on "Chemische Vorgange in der Flamme der Leuchtgase" (Chemical processes in the flame of illuminating gases). In 1857, he was called to Bonn where he studied the effect of the atomic composition of liquids containing carbon, hydrogen and oxygen on the transmission of light. The results were published in 1862–1864 and were a continuation of the previous researches of
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161:(Writings of the Natural Science Society). He was then appointed assistant to Lowig and followed him in 1853 to Breslau. The same year he obtained the degree of Doctor of Philosophy with a thesis "Ueber die Arsenäthyle" (On ethyl compounds of arsenic) which was a notable contribution to the law of chemical valence. After the defense, he went to Berlin to attend lectures of
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Landolt was known for his humor, friendliness, punctuality and cigar. He was fit and worked as usual until the week before his death, when he had a sudden failure of heart and kidney. He was buried, in accordance with his desire, at Bonn where he spent most memorable years of his life.
192:. Later in his life he elaborated the work of Hertz (1887–1888) and demonstrated that light waves are differentiated from electric waves merely by the wavelength, and in 1892 he extended his early work to measurements of the molecular refractivity of organic substances for radiowaves.
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Otto N. Witt (1911). "Obituary notices: Friedrich Konrad
Beilstein, 1838–1906; Emil Erlenmeyer, 1825–1909; Rudolph Fittig, 1835–1910; Hans Heinrich Landolt, 1831–1910; Nikolai Alexandrovitsch Menschutkin, 1842–1907; Sir Walter Palmer, Bart., 1858–1910".
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by various chemicals. In 1880, he was called by the
Prussian Ministry of Agriculture to the newly founded Agricultural College in Berlin, where he remained until 1891. There he constructed new laboratories and collaborated with
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199:, where a chemical institute was built according to his plans. His work there was concerned with the relations between physical properties and chemical constitution. In particular, he made use of polarized light and studied
165:, Rose, Johannes Muller and Dubois. Facilities for experimental research in chemistry were practically non-existent in Berlin at the time, and therefore Landolt left for Heidelberg for a newly founded institute of
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At Bonn, in 1859, Landolt married Milla
Schallenberg, the daughter of Swiss parents settled in Bonn. In 1869, he was appointed to the head of the newly founded technical college at
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in the compilation of the "Physikalisch-chemischen
Tabellen" (Physical-chemical Tables). Their third edition was published in 1905 with the assistance of
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Landolt was born in Zurich and at the age of nineteen entered the university there to study chemistry and physics. He attended the lectures of
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In 1882 Landolt became a member of the Berlin
Academy. Around that time he made highly remarkable investigations into the kinetics of the
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production of calcium and lithium, Landolt started an investigation of the gases produced in the
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386:"Ueber die Zeitdauer der Reaction zwischen Jodsäure und schwefliger Säure [Part 2]"
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388:[On the duration of the reaction between iodic acid and sulfurous acid].
363:[On the duration of the reaction between iodic acid and sulfurous acid].
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In 1856 Landolt returned to
Breslau, where he was soon afterwards joined by
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database. He tested law of mass conservation which was given by
Lavoisier.
361:"Ueber die Zeitdauer der Reaction zwischen Jodsäure und schwefliger Säure"
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133:(5 December 1831 – 15 March 1910) was a Swiss chemist who discovered
105:. Experimentally verified the law of conservation of mass and energy.
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259:, by Otto N. Witt (1853–1915), a publication from 1911, now in the
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and a generous financial support by the Berlin
Academy of Sciences.
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Chairs of the
Commission on Isotopic Abundances and Atomic Weights
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Corresponding members of the Saint
Petersburg Academy of Sciences
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169:. After devoting himself for a short time to the
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365:Berichte der Deutschen Chemischen Gesellschaft
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319:[On ethyl compounds of arsenic].
455:Works by or about Hans Heinrich Landolt
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137:. He is also one of the founders of
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423:"Obituary: Hans Heinrich Landolt"
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153:and published his first work on
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586:Roberto Gonfiantini (2008)
186:Friedrich Konrad Beilstein
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441:10.1002/cber.191104403209
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377:10.1002/cber.188601901293
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16:Swiss chemist (1831-1910)
421:Richard Pribram (1911).
335:10.1002/ardp.18541280329
595:Johanna Irrgeher (2022)
574:Klaus G. Heumann (1992)
559:Norman E. Holden (1980)
317:"Ueber die Arsenäthyle"
232:between iodic acid and
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224:Iodine clock reaction.
589:Willi A. Brand (2010)
577:Ludolf Schultz (1996)
263:in the United States.
230:iodine clock reaction
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135:iodine clock reaction
131:Hans Heinrich Landolt
103:iodine clock reaction
35:Hans Heinrich Landolt
23:Hans Heinrich Landolt
580:Philip Taylor (2002)
384:Landolt, H. (1887).
359:Landolt, H. (1886).
322:Archiv der Pharmazie
315:Landolt, H. (1854).
302:10.1039/CT9119901646
290:J. Chem. Soc., Trans
163:Eilhard Mitscherlich
210:Wilhelm Meyerhoffer
190:John Hall Gladstone
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583:Tiping Ding (2004)
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111:Scientific career
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396:: 745–760.
88:Nationality
59:Switzerland
609:Categories
244:References
155:stibmethyl
47:1831-12-05
343:221455331
145:Biography
120:Chemistry
457:at the
81:Germany
571:(1988)
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197:Aachen
117:Fields
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