Graphite Furnace Solid Sampling System
This system is a graphite furnace direct solid sampling accessory developed by Beijing Beifen-Ruili Analytical Instrument (Group) Co., Ltd. (BFRL) for use with atomic absorption spectrophotometers (AAS). It is specifically designed for the rapid determination of trace heavy metals in complex matrices such as soils and sediments, replacing conventional wet digestion procedures to significantly simplify sample preparation, reduce contamination risks, and minimize the use of corrosive acids.
The system has been validated in accordance with the national standard HJ 1426-2025 "Soil and Sediments — Determination of Cadmium — Direct Solid Sampling/Graphite Furnace Atomic Absorption Spectrometry", making it suitable for emergency monitoring, contaminated site screening, and high-throughput environmental analysis.
Key Performance Parameters
|
Performance Parameter |
Test Result |
Standard Requirement (HJ 1426-2025) |
| Correlation Coefficient (r) | 0.9995 | ≥ 0.995 (Compliant) |
| Method Detection Limit (Cd) | 2.32 pg | Superior to the specified 0.02 mg/kg in the standard |
| Sample Determination Limit (based on 0.5 mg sample) | 0.0019 mg/kg | — |
| Accuracy (CRM GSD-24) | Relative error 82.7% | Relative error ≤ ±25% (Compliant) |
| Accuracy (CRM GSD-2a) | Relative error 81.85% | Relative error ≤ ±25% (Compliant) |
| Repeatability (RSD, GSD-24) | 17.15% | ≤ 25% (Compliant) |
| Repeatability (RSD, GSD-2a) | 14.17% | ≤ 25% (Compliant) |
Key Advantages
1 Digestion-Free, High Efficiency
Eliminates the use of strong acids for digestion, substantially shortening analysis time per sample — ideal for large-batch screening applications.
2 Direct Aqueous Standard Calibration
Validation confirms that quantitative determination can be performed directly using an aqueous standard calibration curve, eliminating the need for matrix-matched standards and simplifying the workflow.
3 Effective Background Interference Removal
Deuterium lamp background correction effectively compensates for non-specific absorption caused by complex matrix components (e.g., chlorides in soil), ensuring reliable analytical results.
4 Fully Compliant with National Standard
All performance metrics — linearity, detection limit, accuracy, and precision — meet the requirements specified in HJ 1426-2025.
Applications
1 Direct determination of cadmium (Cd) in soils, aquatic sediments, and geological materials
2 Rapid screening of contaminated land
3 Environmental emergency response monitoring
4 Routine quality control and certified reference material verification in laboratories
This system has completed full method validation, with all performance indicators meeting the national environmental standard requirements. It is now commercially available for environmental monitoring agencies, geological survey institutes, and research laboratories.
