Abstract:

The determination of silicon content in coal pitch with spectrophotometry is studied. After sample is incinerated, it is fused with sodium carbonate under high temperature to form soluble silicate. It reacts with ammonium molybdate to form molybdosilicate yellow and reduces to molybdosilicate blue with ammonium ferrous sulfate under the strong acidic condition. Under the wave length of 810nm, it has maximum absorption and quantification is done with standard curve method. A color development reaction condition test, precise test, recovery rate test and check test are done. The recovery rate with added specimen is in the range from 91% to 105% and relative standard deviation is less than 7%.