GB/T 6730.58-2017Iron ores -- Determination of vanadium content -- Flame atomic absorption spectrometric method (English PDF)

1 Scope

GB/T 6730 provisions of this part of the flame atomic absorption spectrometry determination of vanadium content.

This section applies to natural iron ore, iron ore, sinter and pellets Determination of vanadium content. Measurement range (mass fraction).

Method 1 is 0.004% ~ 0.06%, Method 2 is 0.06% ~ 0.5%.

2 Normative references

The following documents for the application of this section is essential. For dated references, only the dated version applies to this article

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

GB/T 6379.1 accuracy and accuracy of measurement methods (accuracy and precision) Part 1. General and definitions (GB/T 6379.1-

2004, ISO 5725-1.1994, IDT)

GB/T 6379.2 Accuracy (accuracy and precision) of measurement methods and results - Part 2. Determination of the weight of standard measurement methods

Fundamental methods of renaturation and reproducibility (GB/T 6379.2-2004, ISO 5725-2.1994, IDT)

GB/T 6682 analytical laboratory water regulations and test methods (GB/T 6682-2008, ISO 3696.1987, MOD)

GB/T 6730.1 Preparation of pre-dried samples for iron ore analysis (GB/T 6730.1-2016, ISO 7764.2006, IDT)

GB/T 7728 chemical analysis of chemical products - General rules of flame atomic absorption spectrometry

GB/T 8170 rounded repair rules and limit values of the representation and judgment

GB/T 10322.1 Iron ore sampling and sample preparation methods (GB/T 10322.1-2014, ISO 3082.2009, IDT)

GB/T 12806 laboratory glassware single standard line volumetric flask (GB/T 12806-2011, ISO 1042.1998, NEQ)

GB/T 12807 Laboratory glassware graduated pipette (GB/T 12807-1991, neqISO 835.1981)

GB/T 12808 laboratory glassware single standard pipette

3 principle

Dissolve the test sample in a polytetrafluoroethylene (PTFE) beaker with hydrochloric acid, add hydrofluoric acid and nitric acid, and evaporate to dryness. Hydrochloric acid and boron are added

The acid evaporated again to dryness. Method 1 Dissolved salts with hydrochloric acid and nitric acid, Method 2 dissolved in hydrochloric acid, filtered, the residue was burned and sodium carbonate melt

Melt, dissolve the cooled melt in the filtrate.

(Only for Method 1) .In a solution of cerium (IV) oxide, a solution of phosphoric acid and sodium tungstate was added and the solution was treated with 1 1 of 1-pentanol and 4-a

2-pentanone mixed reagent to extract the vanadium, treating the organic phase with water, and then adding the ascorbic acid solution to extract the vanadium into the water phase.

Measure. Add aluminum chloride solution to the test solution and dilute to a certain volume. In the atomic absorption spectrometer, the test solution into the oxide

In a nitrogen-acetylene flame, the absorbance is measured at a wavelength of 318.5 nm. […]