GB/T 3286.12-2023 in English
VALIDMethods for chemical analysis of limestone and dolornite—Part 12：Determination of potassium oxide and sodium oxide contents—Flame atomic absorption spectrometry method
- Issued on:2023-11-27
- Implemented on:2024-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 3286.12-2023石灰石及白云石化学分析方法 第12部分：氧化钾和氧化钠含量的测定 火焰原子吸收光谱法》由TC183（全国钢标准化技术委员会）归口，TC183SC17（全国钢标准化技术委员会冶金非金属矿产品分会）执行，主管部门为中国钢铁工业协会。
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%
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