GB/T 3286.12-2023
Methods for chemical analysis of limestone and dolomite Part 12: Determination of potassium oxide and sodium oxide content Flame atomic absorption spectrometry (English Version)
- Standard No.
- GB/T 3286.12-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 3286.12-2023
- Scope
- This document describes the method for determining the content of potassium oxide and sodium oxide in limestone and dolomite by flame atomic absorption spectrometry. This document is applicable to the determination of potassium oxide and sodium oxide content in limestone and dolomite. Determination range (mass fraction): potassium oxide content 0.005%~1.00%, sodium oxide content 0.005%~0.50%
- Introduction
GB/T 3286.12—2023 Standard Interpretation
Standard Background and Purpose
GB/T 3286 series standards are comprehensive specifications for chemical analysis methods for limestone and dolomite. This part (Part 12) is specifically for the determination of potassium oxide and sodium oxide. With the continuous improvement of raw material quality requirements in industries such as metallurgy and building materials, it is particularly important to accurately determine the potassium and sodium content in limestone and dolomite.
Determination Principle and Method
This standard adopts flame atomic absorption spectrometry (FAAS) to measure the absorbance of potassium and sodium at wavelengths of 766.5 nm and 589.0 nm respectively by air-acetylene flame. The specific steps include sample decomposition, solution preparation, calibration curve drawing and result calculation.
Measurement steps Detailed description Sample decomposition Use hydrochloric acid, hydrofluoric acid and perchloric acid to decompose the sample, evaporate to near dryness, and then dissolve with hydrochloric acid. Solution preparation After dilution and constant volume, it is used for atomic absorption spectrometer measurement. Calibration curve drawing Prepare a series of standard solutions and draw the concentration-absorbance curves of potassium and sodium.
Instrument and reagent requirements
According to the standard requirements, an atomic absorption spectrometer that meets the requirements of GB/T7728 (equipped with an air-acetylene burner and a potassium-sodium hollow cathode lamp) must be used, and the purity and dosage of the reagents must be strictly controlled. The key instrument parameters include:
- Sensitivity: absorbance of the highest concentration calibration solution ≥ 0.25
- Linear range: ratio between calibration curve segments ≥ 0.7
- Precision: standard deviation of the highest concentration ≤ 1.5% of the average
Measurement range and application case
This method is applicable to the determination of potassium oxide and sodium oxide in limestone and dolomite, with mass fraction ranges of:
Potassium oxide: 0.005%~1.00%
Sodium oxide: 0.005%~0.50%Actual application case
A laboratory analyzed a limestone sample:
- Weigh the sample mass: 0.50 g
- Decomposition process: Use HF, HClO and HCl to completely dissolve the sample
- Measurement results: Potassium oxide content is 0.089%, sodium oxide content is 0.027%
GB/T 3286.12-2023 Referenced Document
- GB/T 6379.1 Accuracy(trueness and precision)of measurement methods and results Part 1:General principles and definitions
GB/T 3286.12-2023 history
- 2023 GB/T 3286.12-2023 Methods for chemical analysis of limestone and dolomite Part 12: Determination of potassium oxide and sodium oxide content Flame atomic absorption spectrometry