GB/T 15057.5-1994 Limestone for chemical industry - Determination of silicon dioxide content- Molybdenum blue spectrophotometric method (English Version)
1 Subject Content and Application Scope
This standard specifies the determination of silicon dioxide content by molybdenum blue spectrophotometric method.
This standard is applicable to the determination of silicon dioxide content in limestone products for chemical industry and the determination range is 0.05%~5%.
2 Normative References
GB 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 9721 Chemical Reagent - General Rules for the Molecular Absorption Spectrophotometry (Ultraviolet and Visible)
3 Method Summary
Melt the specimen with mixed flux of sodium carbonate - boric acid, and then leach with diluted hydrochloric acid. At pH value about 1.1, ammonium molybdate reacts with silicic acid and generates silicon molybdenum heteropoly acid, which is then restored to silicomolybdenum blue with ammonium ferrous sulfate in oxalic acid - sulfuric acid medium by taking ethanol as stabilizer; and measure the absorbance at spectrophotometer wavelength of 680nm.
1 Subject Content and Application Scope
2 Normative References
3 Method Summary
4 Reagents and Solutions
5 Apparatus
6 Specimen
7 Analytical Procedures
8 Plotting of Working Curve
9 Expression of Analysis Results
10 Allowable Difference
Additional Information
GB/T 15057.5-1994 Limestone for chemical industry - Determination of silicon dioxide content- Molybdenum blue spectrophotometric method (English Version)
Standard No.
GB/T 15057.5-1994
Status
valid
Language
English
File Format
PDF
Word Count
1500 words
Price(USD)
70.0
Implemented on
1995-2-1
Delivery
via email in 1 business day
Detail of GB/T 15057.5-1994
Standard No.
GB/T 15057.5-1994
English Name
Limestone for chemical industry - Determination of silicon dioxide content- Molybdenum blue spectrophotometric method
1 Subject Content and Application Scope
This standard specifies the determination of silicon dioxide content by molybdenum blue spectrophotometric method.
This standard is applicable to the determination of silicon dioxide content in limestone products for chemical industry and the determination range is 0.05%~5%.
2 Normative References
GB 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 9721 Chemical Reagent - General Rules for the Molecular Absorption Spectrophotometry (Ultraviolet and Visible)
3 Method Summary
Melt the specimen with mixed flux of sodium carbonate - boric acid, and then leach with diluted hydrochloric acid. At pH value about 1.1, ammonium molybdate reacts with silicic acid and generates silicon molybdenum heteropoly acid, which is then restored to silicomolybdenum blue with ammonium ferrous sulfate in oxalic acid - sulfuric acid medium by taking ethanol as stabilizer; and measure the absorbance at spectrophotometer wavelength of 680nm.
Contents of GB/T 15057.5-1994
1 Subject Content and Application Scope
2 Normative References
3 Method Summary
4 Reagents and Solutions
5 Apparatus
6 Specimen
7 Analytical Procedures
8 Plotting of Working Curve
9 Expression of Analysis Results
10 Allowable Difference
Additional Information