GB/T 9739-2006 Chemical reagent — General method for the determination of iron English, Anglais, Englisch, Inglés, えいご
1 Scope
This standard specifies a general method for the colorimetric determination of iron using 1,10-phenanthroline.
This standard is applicable to the determination of micro iron in chemical reagents. The detection range of the visual colorimetric method is 0.04μg/mL to 2μg/mL (calculated as Fe), and that of the spectrophotometric method is 0.08μg/mL to 2μg/mL (calculated as Fe).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standardare encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions of the normative document referred to applies.
GB/T 602 Chemical reagent - Preparations of standard solutions for impurity (GB/T 602-2002, ISO 6353-1:1982, NEQ)
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods (GB/T 603-2002, ISO 6353-1:1982, NEQ)
GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-1992, neq ISO 3696:1987)
GB/T 9721 Chemical reagent - General rules for the molecular absorption spectrophotometry (ultraviolet and visible)
3 Principle
The Fe(III) in the test solution can be reduced to Fe(II) with ascorbic acid. At pH values ranging from 2 to 9, Fe(II) forms an orange-red complex with 1,10-phenanthroline. Iron can be determined by visual colorimetric method or spectrophotometric method.
