IS 12423:1988 is the Indian Standard (BIS) for method for colourimetric analysis of hydraulic cement. This standard details the colorimetric (spectrophotometric) methods for rapid chemical analysis of hydraulic cement. It provides procedures for determining the percentage of key constituents like silicon dioxide, ferric oxide, aluminium oxide, and others by measuring the light absorbance of their colored chemical complexes.
Method for colourimetric analysis of hydraulic cement
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Analytical Technique | Colorimetry/Spectrophotometry is the focus. | X-Ray Fluorescence (XRF) is the reference method; wet chemistry (including colorimetry) is the alternative. | EN 196-2:2013 |
| Silicon Dioxide (SiO₂) Determination | Molybdenum blue method after forming a silicomolybdate complex. | A similar molybdosilicate method (colorimetric) is an option, but the referee method is gravimetric (double dehydration). | ASTM C114-18 |
| Manganese Oxide (MnO) Determination | Oxidation to permanganate using potassium periodate and measuring its color. | Essentially identical method: oxidation of manganese to the permanganate ion using periodate, followed by spectrophotometric measurement. | ASTM C114-18 |
| Titanium Dioxide (TiO₂) Determination | Method using Tiron (disodium-1,2-dihydroxybenzene-3,5-disulphonate) to form a colored complex. | Provides optional methods using either Tiron or hydrogen peroxide (which forms a yellow peroxytitanium complex). | ASTM C114-18 |
| Iron (III) Oxide (Fe₂O₃) Reagent | Salicylic acid is used as the complexing agent. | 1,10-phenanthroline is a common complexing agent in the optional spectrophotometric method. | ASTM C114-18 |
| Status of Method | Presented as a standard method of analysis. | Spectrophotometric methods are generally classified as 'Optional' or 'Rapid' Test Methods. | ASTM C114-18 |