GB/T 6730.84-2023 English PDF (GBT6730.84-2023)

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GB/T 6730.84-2023: Iron ores - Determination of total rare earth content - Inductively coupled plasma atomic emission spectrometric method
GB/T 6730.84-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.10
CCS D 31
Iron ores - Determination of total rare earth content -
Inductively coupled plasma atomic emission spectrometric
method
ISSUED ON: AUGUST 06, 2023
IMPLEMENTED ON: MARCH 01, 2024
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Principles ... 6
5 Reagents and materials ... 6
6 Instruments and equipment ... 10
7 Sampling and specimen preparation ... 10
8 Analytical procedures ... 10
9 Result calculation and representation ... 13
10 Test report ... 16
Appendix A (Informative) Released Parts of GB/T 6730 ... 17
Appendix B (Normative) Procedure for acceptance of specimen analysis results ... 22
Appendix C (Informative) Precision test raw data ... 23
Iron ores - Determination of total rare earth content -
Inductively coupled plasma atomic emission spectrometric
method
Warning - Personnel using this document shall have practical experience in
regular laboratory work. This document does not identify all possible safety issues.
Users are responsible for taking appropriate safety and health measures and
ensuring compliance with the conditions, which are stipulated in relevant national
regulations.
1 Scope
This document describes a method for the determination of total rare earth content, by
inductively coupled plasma atomic emission spectrometry.
This document is applicable to the determination of the total rare earth content in iron
ore, iron concentrate, sinter, pellet mineral products. Determination range (mass
fraction): 0.10% ~ 15.00%.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 6379.1 Accuracy (trueness and precision) of measurement methods and
results - Part 1: General principles and definitions
GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and
results - Part 2: Basic method for the determination of repeatability and
reproducibility of a standard measurement method
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 6730.1 Iron ores - Preparation of pre-dried test samples for chemical analysis
GB/T 8170 Rules of rounding off for numerical values and expression and judgement
of limiting values
5.8 Hydrochloric acid, 5 + 95.
5.9 Nitric acid, ρ≈1.42 g/mL.
5.10 Nitric acid, 1 + 1.
5.11 Hydrogen peroxide, 30%.
5.12 Sodium hydroxide lotion, 20 g/L.
Weigh 2 g of sodium hydroxide. Dissolve it in 100 mL of water.
5.13 Triethanolamine, 5 + 95.
Measure 5 mL of triethanolamine. Add 95 mL of water. Mix well.
5.14 Yttrium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of yttrium oxide [w (Y2O3/REO) ≥ 99.99%, w (REO) ≥ 99.5%] that
has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
5.15 Lanthanum oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of lanthanum oxide [w (La2O3/REO) ≥ 99.99%, w (REO) ≥ 99.5%]
that has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
5.16 Cerium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of cerium oxide [w (CeO2/REO) ≥ 99.99%, w (REO) ≥ 99.5%] that has
been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of nitric acid
(see 5.10). Heat at low temperature. Dropwise add hydrogen peroxide (see 5.11), until
it is completely dissolved. Cool to room temperature. Transfer to a 100 mL volumetric
flask. Use water to dilute it to the mark. Mix well.
5.17 Praseodymium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of praseodymium oxide [w (Pr6O11/REO) ≥ 99.99%, w (REO) ≥ 99.5%]
that has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
5.18 Neodymium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of neodymium oxide [w (Nd2O3/REO) ≥ 99.99%, w (REO) ≥ 99.5%]
that has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
5.19 Samarium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of samarium oxide [w (Sm2O3/REO) ≥ 99.99%, w (REO) ≥ 99.5%]
that has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
5.20 Europium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of europium oxide [w (Eu2O3/REO) ≥ 99.99%, w (REO) ≥ 99.5%] that
has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
5.21 Gadolinium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of gadolinium oxide [w (Gd2O3/REO) ≥ 99.99%, w (REO) ≥ 99.5%]
that has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
5.22 Terbium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of terbium oxide [w (Tb4O7/REO) ≥ 99.99%, w (REO) ≥ 99.5%] that
has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of nitric
acid (see 5.10). Heat at low temperature to dissolve it completely. Cool to room
temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the mark.
Mix well.
5.23 Dysprosium oxide standard storage solution, 1 mg/mL.
Weigh 0.1000 g of dysprosium oxide [w (Dy2O3/REO) ≥ 99.99%, w (REO) ≥ 99.5%]
that has been burned at 950 °C for 1 hour. Place it in a 100 mL beaker. Add 10 mL of
hydrochloric acid (see 5.7). Heat at low temperature to dissolve it completely. Cool to
room temperature. Transfer to a 100 mL volumetric flask. Use water to dilute it to the
mark. Mix well.
6 Instruments and equipment
Unless otherwise specified, use usual laboratory equipment. Single-marked volumetric
flasks, graduated pipettes, single-marked pipettes shall comply with the requirements
of GB/T 12806, GB/T 12807, GB/T 12808, respecti...