1 Scope
This Standard specifies the determination method for iron content of the pulp board for viscose fiber - 1,10-phenanthroline photometric method.
This standard is applicable to various pulp boards for viscose fiber.
2 Normative References
The following documents contain provisions which, through reference in this Standard, constitute provisions of this Standard. At the time of publication, all editions indicated are valid. All standards are subject to revision, and all parties coming to an agreement according to this Standard are encouraged to study whether the latest editions of these documents apply.
GB/T 8170-87 Rules for Rounding off of Numerical Values
FZ/T 50010.1-1998 Pulp Board for Viscose Fiber - Sampling Method
FZ/T 50010.2-1998 Pulp Board for Viscose Fiber - Determination of Moisture Content
FZ/T 50010.5-1998 Pulp Board for Viscose Fiber - Determination of Ash Content
3 Principle
Ashing of the sample and dissolution of the ash in hydrochloric acid. Reduction of the trivalent iron with hydroxylammonium chloride into ferrous iron. Formation of a red complex between the ferrous iron and 1,10-phenanthroline under sub-acid conditions, and colorimetric determination of the colored complex with the iron standard solution at a wavelength of 510nm by the photometric method.
