Analytical Chemistry

1749 

• Caspar Neumann  edits "Chymial Medicinae dogmatico experimentalis, Tom primi; Pars prima et secunda", in which the foundations of the acidimetry are laid  

150 years ago
1849 

• Lyon Playfair obtains sodium nitroprusside by action of nitrous acid on red prussiate. This substance is a very sensitive reagent on alkaline sulphurets giving a beautiful purple reaction product  

50 years ago 
1949 

• Th Wieland et al discover a method of paper chromatography for the quantitative determination of amino-acids with radioactive copper