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Determination of Iron in the Presence of Large Amounts of Phosphate by Titration with Disodium Dihydrogen Ethylenediaminetetraacetate by L.T. Butt; N. Strafford is a Chemistry article available to read on EtoBox.

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CHENG, BI~AY ANL) KUIIT%\* determined ferric iron in soils by direct titration with the disodium salt of ethylenediaminetetraacctic acid (Complexone III, Verscnate, subsequently referred to as EDTA) at pn 2-3 using Tiron (disodium-I :z-dihydroxybcnzene-3 :5-disulphonate) or salicylic acid as indicator and claimed that 0.1 g Na,HPO,.r2H,O did not interfere in the direct titration of 3-20 mg iron; they found, however, that if the soil contained an abnormally large amount of phosphate, interference with the end-point was encountered, although good results were obtained by adding excess of EDTA and back titrating with ferric solution. Titrations of iron using cscess EDTA as recommcndcd by CIIENG, RIZAY AND KURTZ were found to be unsatisfactory in the prcscnce of o.G g Na,HPO,.xzH,O; with salicylic acid as indicator no distinct end-point was observed and with Tiron as indicator the colour change at the end-point was poor and the rccovcry of iron low. It has been found, however, that 30 mg of iron can be determined in the presence of as much as I g Na,Hl?O,.IzH,O by titrating with EDTA, using ammonium thiocyanate as indicator and extracting the red ferric thiocyanate into amyl alcohol or

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Author

L.T. Butt; N. Strafford

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1955

Language

EN

Field

Chemistry (Physical Sciences)