This part of GB/T 223 specifies a method for determination of calcium and magnesium contents in iron, cast iron, steel, and alloyed steel by inductively coupled plasma (ICP) atomic emission spectrometry.
This part is applicable to the determination of calcium and magnesium contents (mass fraction) in the range of 0.000 5% to 0.006% and 0.000 5% to 0.20%, respectively.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 385 Laboratory Glassware — Burettes
ISO 648 Laboratory Glassware — Single-volume Pipettes
ISO 1042 Laboratory Glassware — One Mark Volumetric Flasks
ISO 3696 Water for Analytical Laboratory Use — Specification and Test Methods
ISO 14284 Steel and Iron — Sampling and Preparation of Samples for the Determination of Chemical Composition)
3 Principle
A test portion is dissolved in a hydrochloric, nitric and hydrofluoric acid mixture and fumed with perchloric acid. Hydrochloric acid, nitric acid, and an internal standard element (if used) are added and the solution is diluted to a known volume. The solution is filtered if necessary, nebulized into an ICP spectrometer and the intensity of the emitted light from each element measured simultaneously with the intensity of the light emitted by the internal standard element.
4 Reagents
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade with very low calcium and magnesium contents and only grade 2 water as specified in ISO 3696.
4.1 Pure iron, containing less than 0.5 μg/g of calcium and magnesium.
GB/T 223.88-2019 The following standards are cited：
GB/T 223.88-2019 Cited by the following standards：
