Chlorophosphonazo-III
Metal Indicator
-
Product codeC010 Chlorophosphonazo-III
-
CAS No.1914-99-4
-
Chemical name2,7-Bis(4-chloro-2-phosphonophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonic acid
-
MWC22H16Cl2N4O14P2S2=757.37
| Unit size | Price | Item Code |
|---|---|---|
| 100 mg | C010-10 | |
| 1 g | C010-12 |
Product Description
Chlorophosphonazo-III is a colorimetric reagent for thorium, uranium, lanthanoids, actinoids, and alkaline earth metals. This reagent is readily soluble in water and is violet at pH 4 or lower, blue in NaOH solution, and brilliant green in acids such as H2SO4, HCl and diluted HNO3 (it decomposes in concentrated HNO3). Its proton dissociation constants are reported to be -1.1, -1.1, 0.6, 0.8, 1.5, 2.5, 5.47, 7.20, 12.15 and 15.13 (μ=0.1, 20ºC). Chlorophosphonazo-III is used as a selective colorimetric reagent for calcium in a mixed Ca/Mg sample in the pH range of 2-3. It is also a useful indicator for the precipitation titration of SO42- using Ba2+ as a standard solution.
Chemical Structure
Technical info
Table 1 Metal Detection Conditions Using Chlorophosphonazo-III
References
1) K. Ueno, T. Imamura and K. L. Cheng, "Handbook of Organic Analitical Reagents 2nd Edition", CRC Press, 1992.
2) L. R. Snyder and B. E. Buell, "Characterization and Routine Determination of Nonbasic Nitrogen Types in Cracked Gas Oils by Linear Elution Adsorption Chromatography", Anal. Chem., 1964, 36(4), 767.
3) J. W. Ferguson, J. J. Richard, J. W. O'laughlin and C. V. Banks, "Simultaneous Spectrophotometric Determination of Calcium and Magnesium with Chlorophosphonazo-III", Anal. Chem., 1964, 36, 796.
4) D. S. Howell, J. C. Pita, J. F. Marquez, "Ultramicro Spectrophotometric Determination of Calcium in Biologic Fluids", Anal. Chem., 1966, 38, 434.
5) T. Yamamoto, "Extraction-photometric Determination of Uranium(IV) with Chlorophosphonazo-III", Anal. Chim. Acta, 1973, 65, 329.
6) M. Zenki, T. Masutani and T. Yokoyama, "Repetitive Determination of Calcium Ion and Regeneration of a Chromogenic Reagent Using Chlorophosphonazo III and an Ion Exchanger in a Circulatory Flow Injection System", Anal. Sci., 2002, 18, 1137.
Handling and storage condition
| Appearance： | Reddish brown to black purple crystalline powder |
|---|---|
| Solubility in water： | To pass test (clear, reddish purple) |
| Absorbance： | ≧ 0.530 (around 550 - 570 nm) |
| Sulfated ash： | ≦ 20.0 % |
| IR spectrum： | Authentic |
| Ambient temperature |
