Colorimetry Determines Tungsten Trioxide in Tungsten Concentrate

Colorimetry method is based on the color reaction to form colored compound, it is measured by comparing the colored substance solution or color depth to determine the content of the component. Colorimetry is an analysis of the color reaction of the basic requirements: the reaction should have a high sensitivity and selectivity, consisting of colored compound produced by the reaction that is constant and stable, it is the larger color difference and color agents. Selecting the appropriate color reaction and controlling the appropriate reaction conditions, which is the key to colorimetry analysis.

There are two commonly colorimetry: visual colorimetry and photoelectric colorimetry, visual colorimetry method is a commonly standard method, which uses different amounts of analyte standard solution in the exact same set of colorimetry tube. The sample solution is also the color under identical conditions, and the standard color gamut is visually identified, the amount of the standard solution can be contained, calculating and determining the content of the sample analytes.

The high levels of tungsten trioxide is determined generally by the use of photoelectric colorimetry, according to the situation of tungsten concentrate, which is based on selecting the visual colorimetry, and acidity, potassium thiocyanate, etc. The test of amount of titanium trichloride conditions is that weighing accurately 0.500 g sample of 2 g of sodium hydroxide flux of iron crucible, placing in a muffle furnace, the temperature is gradually raised to 85 ℃, heating it 25 to 30 minutes, removing to a pre-melted into a 300 ml beaker , heating the water to about 100 ml, which is immediately placed on a hot plate 2 a boil for 5 minutes, removing ,cooling, and washing out the iron orange vortex. The solution can be transferred into a 250-mL volumetric flask diluting the mark.

• < Prev
• Next >