Spectrophotometric Determination of Silicon in Rice and Alloy Steel Samples

Abstract

In the medium of 0.128 mol/L nitric acid and 0.450 mol/L sulfuric acid, silicon(IV) and ammonium molybdate form molybdosilicate blue blue complex in the presence of ascorbic acid. The maximum absorption wavelength of the complex locates at 810 nm. The apparent molar absorptivity is ε_810 nm = 3.18 × 10⁴ L · mol⁻¹ · cm⁻¹. Beer's law is followed over the range of 0 ∼ 1.0 µg/mLof silicon(IV). The present method has been successfully applied to the determination of silicon in rice and alloy steel samples.

Keywords:

• Ammonium molybdate
• Molybdosilicate blue
• Rice
• Silicon
• Spectrophotometry
• Steel sample

Notes

^a Notes: Steel-1^# was BH 1303-1A low alloy steel. Its component content(%): Si:0.41; C:0.185; P:0.016; S:0.0047; Mn:1.40; Cu:0.21; V:0.105.

Steel-2^# was BH 1301-1A low alloy steel. Its component content(%): C:0.075; S:0.008; Si:0.54; Ni:0.042; Cr:0.061; Mn:1.01; Cu:0.12; P:0.011; V:0.058.

The unit of the determined result of the rice sample was with “µg/g”.

The unit of the determined result of the steel sample was with “%”.