Published online by Cambridge University Press: 14 March 2018
The techniques previously employed in this laboratory for removing free iron oxide from soil clays were the acid ammonium oxalate and the aluminium-ammonium tartrate methods (Tamm, 1922; Dion, 1944). Since both had disadvantages, especially when determining the iron by sodium salicylate (Scott, 1941), the use of sodium hydrosulphite, Na2S2O4, (Galabutskaya and Govorova, 1934; Deb, 1950) was fully investigated in the hope that it might lead to the development of a satisfactory, completely inorganic procedure.
This is a brief summary. For full details consult the papers of Mitchell and Mackenzie (1954) and Mackenzie (1954).