Tiron acid-disodium salt

Tiron see l,2-dihydroxybenzene-3,5-disulphonic acid, disodium salt. 

The indicator substance for iron determination is Tiron [4,5-dihydroxy-l,3-benzenedisulfonic acid, disodium salt] (Acros Organics, Geel, Belgium). The stock solution used to prepare the calibration samples contains Ig Fe/L (solution of Fe(N03)3-4aq in HNO3 0.5N) (Panreac Quimica, Barcelona, SP). 

A buffer mixture of ammonium sulfate and sulfuric acid can also be employed for the elution of aluminum. Its specific detection is carried out via derivatization with Tiron (4,5-dihydroxy-1,3-benzenedisulfonic acid disodium salt) with subsequent photometry of the complex formed at a wavelength of 313 nm (Fig. 3-160). In an acidic sulfate medium aluminum ions exist as A1S04+ ions depending on the hydrogen ion and sulfate ion concentration. The parameter determining retention is, in this case, the ammonium sulfate concentration. 

Pyrocatechol-3,5-disulfonic acid disodium salt (Tiron)... 

A post-column derivatization with subsequent photometric detection has also been developed for the determination of aluminium. Using a mixture of ammonium sulfate and sulfuric acid, aluminium is separated as A1S04+ ion on a cation exchanger. It forms a stable complex with the disodium salt of 4,5-dihydroxy-l,3-benzenedisulfonic acid (Tiron) at pH 6.2 which can be detected at 313 nm. 

Disodium salt of 4,5-dihydroxy-1,3-bensene disulfonic acid (Tiron) Nair et al. (1981-1)... 

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]. 

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