GB/T 6730.79-2019Iron ores - Determination of cadmium content - Hydride generation-atomic fluorescence spectrometric method (English PDF)

1 Scope

This part of GB/T 6730 specifies the determination of cadmium in iron ore by atomic fluorescence spectrometry.

This section applies to natural iron ore, iron concentrates and lump ore, including the determination of cadmium content in sintered products. Measuring range (mass score).

0.00002%~0.020%.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 6379.1 Accuracy of measurement methods and results (accuracy and precision) Part 1. General and definition

GB/T 6379.2 Accuracy of measurement methods and measurement results (accuracy and precision) Part 2. Determining standard measurement methods

Basic method of repeatability and reproducibility

GB/T 6682 Analytical laboratory water specifications and experimental methods

GB/T 6730.1 Preparation of pre-dried samples for iron ore analysis

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

GB/T 10322.1 Iron ore sampling and sample preparation method

GB/T 12806 laboratory glass instrument single standard line volumetric flask

GB/T 12807 laboratory glass instrument indexing pipette

GB/T 12808 laboratory glass instrument single standard line pipette

GB/T 21191 Atomic Fluorescence Spectrometer

3 Principle

Decompose the sample with hydrochloric acid, nitric acid, hydrofluoric acid, add perchloric acid fuming, mask the interfering elements in the test solution with a masking agent, and use nickel chloride as the

The sensitizer, under certain acidity, the test solution and the sodium borohydride solution are used to generate cadmium chemical vapor through the hydride generator, and enter the quartz tube with the carrier gas.

The fluorescence intensity was measured on an atomic fluorescence spectrometer, and the cadmium content was calculated according to the standard curve method.

4 reagents

In the analysis, unless otherwise stated, only approved analytical reagents and secondary water in accordance with GB/T 6682 or equivalent in purity are used.

Water.