- Method Overview
The dissolved ore sample is measured for absorbance at 242.8 nm using an atomic absorption spectrometer, and the gold content is quantified by comparison with a standard curve.
- 2. Instruments and Reagents
2.1 Instruments and Equipment
2.1.1 Detection Instruments
Flame Atomic Absorption Spectrophotometer (With Gold Hollow Cathode Lamp)
Acetylene (1 bottle,Purity≥99.99%)
Air Compressor (Rated Discharge Pressure: 0.3 MPa )
2.1.2 Pretreatment Equipment
Ultra-Pure Water System
Micropipettes
Volumetric Flasks
2.2 Reagents
2.2.1 Reagents
Hydrochloric Acid
2.3 Standards
2.3.1 Stock Solution
GSB04-1715-2004 Gold Standard Stock Solution 1000 μg/mL
- Sample Testing
3.1 Testing Conditions
Reference testing conditions for the flame atomic absorption spectrophotometer:
Element Gold
Wavelength (nm) 242.8
Spectral Bandwidth (nm) 0.4
Element Lamp Current (mA) 4.0
Gas Height (mm) 6
Gas Flow Rate (mL/min) 1300
Air Compressor Pressure (MPa) 0.22
3.2 Sample Testing Steps
Adjust the instrument to its optimal working state, ignite the flame, and adjust the gas flow rate. Sequentially test the standard and sample solutions, read the data, input the sample weight, and view and record the results.
3.3 Result Calculation
The gold content in the sample is calculated using the following formula:
Where:
ρ(Au) — Mass concentration of gold in the test solution, in milligrams per liter (mg/L);
m — Mass of gold in the sample obtained from the calibration curve, in micrograms (μg);
V — Volume of the sample solution, in milliliters (mL).
