Reagent Tiron

Many other reagents have been used for determining iron, e.g., sulphosalieylic acid [106-109], ferron (7-iodo-8-hydroxyquinoline-5-sulphonic acid) (e = 4.0-10 at 610 nm) [110], Tiron [111,115], HTTA [116,117], pyrocatechol [118], phenylfluorone (in presence of Triton X-100 [119], morin (in the presence of a surfactant e = 6.3-10 ) [120-122], Alizarin S (extraction with Aliquat 336 in CHCI3] [123], Purpurin [124,125], salicylates[126,127], 2,2 -diquinoxalyl [128], sulphanilic acid in the presence of a surfactant [129], haematoxylin [130], and hydroxamic acid derivatives [13,14,131,132]. 

Other organic reagents recommended for determination of Mo include Alizarin Complexone [103], l-nitroso-2-naphthol [104], morin [105], rutin [106], quercetin [107], 1,5-diphenylcarbazone [108], quinalizarin in the presence of surfactant [109], tiron [12,31,39], and 2,2 -biquinoxalyl [110]. The FIA technique has been applied in the determination of Mo with the use of carminic acid [111]. 

Some o-diphenols, such as Tiron [63-67] and pyroeateehol [68-70] have also been used for determining Ti. These reagents are used in the presenee of diphenylguanidine and antipyrine bases, thus enabling extraction of the Ti complexes. 

Fe(III) Turbid pharmaceutical formulations Dialysis UV-Vis 45.0 mg L 1 Sequential injection system two subsystems each with a different holding coil, tiron as the colourforming reagent several flow reversals [536]... 

Disodium-l,2-dihydroxybenzene-3,5-disulfonate (tiron) yields a strong yellow color when reacted with titanium salts in the pH range of 4.3-9.6 [15]. Titanium salts also react with 5- ilf< alicylic acid at pH 3-5 to yield yellow solutions [16]. Other reagents which have found limited use in identification testing are thymol [17], gallic acid [18], and salicylic acid [19]. 

The yellow colors developed by titanium salts with tiron [15] and sulfosalicylic acid [16,42] have also been used to develop quantitative spectrophotometric assay methods. Other useful reagents include tichromin and dibromotichromin [43], chromotropic acid [44], chlorophosphonazo I [45], and diantipyrylmethane [46]. The diantipyrylmethane reagent has also been used to measure Ti salts after these have been stripped off a silica gel column [47]. 

Add the required volume of distilled water to take the volume of each solution up to 35 cm Add 5 cm of Tiron reagent and neutralize to Congo red paper with 50% ammonia solution, add 5 cm of pH 4.7 acetic acid/sodium acetate buffer solution and dilute to the mark with distilled water. 

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