GB/T 3049-2006 Chemical products for industrial use - General method for determination of iron content - 1 10-Phenanthroline spectrophotometric method (English Version)
Chemical products for industrial use - General method for determination of iron content - 1, 10-Phenanthroline spectrophotometric method
1 Scope
This standard specifies a general 1, 10-phenanthroline spectrophotometric method for the determination of the iron content of chemical products for industrial use.
It describes a technique for the determination of the content of iron in a solution. Reference shall be made, for the preparation of the test solution, to the standards relating to the product to be analysed, which shall indicate the modifications necessary to make the method applicable to that product.
2 Field of application
The method is applicable to test solutions from which an aliquot portion can be taken containing between 10 and 500 μg of Fe in a volume of not more than 60mL.
Large amounts of alkali metals, calcium, strontium, barium, magnesium, manganese (II), arsenic (III), arsenic(V), uranium(VI), lead, chloride, bromide, iodide, thiocyanate, acetate, chlorate, nitrate, sulphate, sulphide, metaborate, selenate, citrate, tartrate, phosphate and up to 100 mg of germanium(IV), in the test solution, do not interfere. In the presence of tartrate, citrate, arsenate or more than 100 mg of phosphate, colour development is, however, liable to be slower.
Details of certain interferences and means by which they can be overcome are given in Annex A.
3 Principle
Reduction of all the Fe3+ present in the test solution to Fe2+ with ascorbic acid. Formation of the orange-red complex between iron and l,l0-phenanthroline at a pH between 2 and 9, and spectrophotometric measurement of the absorbance of the complex at the wavelength of maximum absorption (510nm).
Under the specified conditions, the complex is measured at a pH between 4 and 6.
4 Reagents
Foreword I 1 Scope 2 Field of application 3 Principle 4 Reagents 5 Apparatus 6 Procedure 7 Expression of results 8 Test report Annex A (Informative) Interferences
GB/T 3049-2006 Chemical products for industrial use - General method for determination of iron content - 1 10-Phenanthroline spectrophotometric method (English Version)
Standard No.
GB/T 3049-2006
Status
valid
Language
English
File Format
PDF
Word Count
5000 words
Price(USD)
100.0
Implemented on
2007-6-1
Delivery
via email in 1 business day
Detail of GB/T 3049-2006
Standard No.
GB/T 3049-2006
English Name
Chemical products for industrial use - General method for determination of iron content - 1 10-Phenanthroline spectrophotometric method
Chemical products for industrial use - General method for determination of iron content - 1, 10-Phenanthroline spectrophotometric method
1 Scope
This standard specifies a general 1, 10-phenanthroline spectrophotometric method for the determination of the iron content of chemical products for industrial use.
It describes a technique for the determination of the content of iron in a solution. Reference shall be made, for the preparation of the test solution, to the standards relating to the product to be analysed, which shall indicate the modifications necessary to make the method applicable to that product.
2 Field of application
The method is applicable to test solutions from which an aliquot portion can be taken containing between 10 and 500 μg of Fe in a volume of not more than 60mL.
Large amounts of alkali metals, calcium, strontium, barium, magnesium, manganese (II), arsenic (III), arsenic(V), uranium(VI), lead, chloride, bromide, iodide, thiocyanate, acetate, chlorate, nitrate, sulphate, sulphide, metaborate, selenate, citrate, tartrate, phosphate and up to 100 mg of germanium(IV), in the test solution, do not interfere. In the presence of tartrate, citrate, arsenate or more than 100 mg of phosphate, colour development is, however, liable to be slower.
Details of certain interferences and means by which they can be overcome are given in Annex A.
3 Principle
Reduction of all the Fe3+ present in the test solution to Fe2+ with ascorbic acid. Formation of the orange-red complex between iron and l,l0-phenanthroline at a pH between 2 and 9, and spectrophotometric measurement of the absorbance of the complex at the wavelength of maximum absorption (510nm).
Under the specified conditions, the complex is measured at a pH between 4 and 6.
4 Reagents
Contents of GB/T 3049-2006
Foreword I
1 Scope
2 Field of application
3 Principle
4 Reagents
5 Apparatus
6 Procedure
7 Expression of results
8 Test report
Annex A (Informative) Interferences
