IS 3025 : Part 35 : 2024 Methods of Sampling and Test (Physical and Chemical) For Water and Wastewater - Part 35 Silica
1 SCOPE
This standard (Part 35) prescribes the following methods for determination of silicon as silica (SiO2) in water and wastewater:
a) Gravimetric method (is not recommended when samples contain less than 20 mg SiO2/l);
b) Molybdosilicate method (measurable range is 0.4 mg SiO2/l to 25 mg SiO2/l);
c) Heteropoly blue method (measurable range is 0.04 mg SiO2/l to 2 mg SiO2/l);
d) Automated method for molybdate-reactive silica method (measurable range is 0 mg SiO2/l to 20 mg SiO2/l); and
e) Inductively coupled plasma spectroscopy method.
2 REFERENCES
The standards listed in Annex A contain provisions which through reference in this text, constitute provision of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of these standards.