Tiron
Metal Indicator
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Product codeT021 Tiron
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CAS No.270573-71-2
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Chemical name1,2-Dihydroxy-3,5-benzenedisulfonic acid, disodium salt, monohydrate
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MWC6H4Na2O8S2･H2O=332.22
| Unit size | Price | Item Code |
|---|---|---|
| 5 g | T021-10 |
Description
Tiron is used as a metal indictor of Fe, and as a colorimetric reagent of Fe, Al, Ti, and other metal ions. Tiron is readily soluble in water as a colorless solution. The pKa2 is reported to be 12.6 (μ=0.1, 20ºC). Tiron forms colored chelates with Fe, Ti, and other metal ions. The color of the Fe complex is blue at pH 1-4 (1:1, logK=20.4), purple at pH 5-7 (1:2, logK=15.1), and red at pH 7 or over (1:3, logK=10.8).
Technical info
Chelate titration: Fe
Colorimetry: Al, B, Co, Cu, Fe, Ga, Mo, Nb, Os, Sr, Ti, UO2(II), V
Fluorometry: rare earth metals
Masking reagent: Al, Cr, Fe, Ti
References
1) K. Ueno, T. Imamura and K. L. Cheng, "Handbook of Organic Analitical Reagents 2nd Edition", CRC Press, 1992.
2) G. F. Atkinson and W. A. E. McBryde, "Oxidation of the Analytical Reagent Tiron (Disodium-4,5-Dihydroxybenzene-1,3-Disulphonate)", CanJ. Chem., 1957, 35, 477.
3) P. N. R. Nichols, "The Photometric Determination of Titanium with Tiron", Notes, 1960, 85, 452.
4) L. J. Clark, "Titanium Determination with Disodium-1,2-Dihydroxybenzene-3,5-Disulfonate (Tiron) in Oxalic Acid Solution", Anal. Chem., 1970, 42, 694.
Handling and storage condition
| Appearance： | White powder or crystal |
|---|---|
| Purity (Titration)： | ≧ 98.0 % |
| Solubility in water： | To pass test (clear, colorless) |
| Sulfated ash： | 40.0 - 46.0 % |
| Absorbance (Ti complex)： | ≧ 0.280 (around 380 nm) |
| Sensitivity： | To pass test |
| IR spectrum： | Authentic |
| Ambient temperature |
