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Pawel Krumholz

Pawel Krumholz, Polish-born Brazilian chemist and spectroscopist (Rajcza, Zywiec County 30 August 1909 – São Paulo 11 August 1973)
Authored 84 papers
Respected as a world authority on coordination compounds chemistry
Known internationally for his studies about iron complexes with imine bi- and multi-toothed  ligands 
With H. Stammreich performed the first studies in elucidating the structure of metal-carbonyl employing Raman spectroscopy and first to demonstrate the existence of metal-metal bonds in metal-carbonyl compounds (1971) 
Discovered aliphatic poly-toothed imine complexes (confirmed by Busch and Bailar)
Discovered the acid nature of tetracarbonyl iron hydride
Discovered the oxidation of coordinated di-imines 
With Feigl & Hamburg proposed sodium sulfite as a reducing agent and as a buffer

With Feigl invented quinalizarin test 


With Feigl developed benzidine reaction of silicic acid


With Stettiner first observed tetracarbonylferrate (-II) dianinon (1949)



Many micro analytical techniques for ions in transition metals (1933-8)

Many processes separation and purification of rare earths (patented)

Hydrometallurgical processes for obtaining vanadium, molybdenum and iridium from its



Discovered new photographic sensitizers 


With J. Bril a polarographic method for studying transition metals complexes using ethylenediamineacetate
A medium resolution grating spectrophotometer (1951)

PATENTS  (at least 18 patents; incomplete list)

With J.B. Madjar & K.J. Bril. Process of preventing the formation of emulsions. CA638759 (1962)

Improvements in and relating to the separation of rare earths. GB886179 (1962)

With K.J. Bril. Process for separation of metal salts. CA625916 (1961)

A process for separating cerium from other rare earths. GB862613 (1961)

A process for separating ions by ion-exchange. GB862688 (1961)

Separating rare earths by fractional precipitation of their hydroxides or basic salts. CA597180 (1960)

Improvements relating to processes for the separation of components of mixtures containing rare earths and, if desired, yttrium. GB854926 (1960)

With K.J. Bril. Method for separating mixtures of rare earths. CA597182 (1960)

With K.J. Bril. Separation of yttrium and the elements of the rare earth groups. CA597183 (1960)



Heller-Krumholz method for mercury (1929)

Krumholz-Feigl-Rajmann reagent for palladium, platinum and zircon (1931)

Thiocyanate-stannous chloride method of Feigl-Krumholz (1932)

Feigl-Krumholz test or method (1933)

Krumholz-Vasquez Sanchez reagent or mercuric thiocyanate reagent for zinc (1934)

Krumholz-Kruh test for cadmium (1935)

Krumholz-Hoenel reagents for mercury, copper, iron and cadmium (1937)

Feigl-Krumholz gas-reaction vessel



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