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7809940 
Journal Article 
Chelatometric titration of iron, zinc and aluminium involving masking and demasking with acetylacetone 
Mondal, JK; Basak, S; Mukherjee, SS; Kundu, D 
2002 
Yes 
Journal of the Indian Chemical Society
ISSN: 0019-4522 
79 
1 
92-94 
English 
WOS:000173856000019 
A stepwise complexometric method with EDTA has been developed for the determination of iron, zinc and aluminium in a single aliquot solution involving direct titration of iron(III)-acetylacetonate at pH 3.0 using acetylacetone as an auto-indicator. Zinc is determined in the same solution by direct titration with EDTA raising pH to 5.3 using xylenol orange as indicator, while aluminium being masked with acetylacetone at room temperature (25 50). However, aluminium is determined in the same solution indirectly with EDTA at pH 5.3 using xylenol orange as indicator after demasking aluminium from aluminium acetylacetonate at 90degrees and formation of Al-EDTA complex. Alternatively, aluminium may be determined by adding NaF and titrating released EDTA with zinc acetate solution. Interferences due to titanium, zirconium, manganese, nickel, cobalt, copper and chromium have been eliminated by complexing them with different ligands. The method has been standardised against synthetic solutions and applied to various enamel and frit samples.