Silcate

This method is used for the determination of silicate in drinking, surface and saline waters, domestic and industrial wastes, plants and soils. The low level range of this method is 1 to 100 µg/L as Si. However, this method is also applicable to other ranges.

Summary

β-molybdosilicic acid is formed by the reaction of silicate with molybdate in an acid medium. The β-molybdosilicic acid is reduced by tin (II) to form molybdenum blue with an absorbance maxima at 820 nm and 660 nm. 

Limitations

Interference from orthophosphate and tannin is eliminated by the use of tartaric acid. Filter turbid samples before determination. Color absorbing at the analytical wavelength will interfere.

Availability