GeminAA Plus is an advanced Atomic Absorption Spectrophotometer with flame absorption capability. It features a combined flame and graphite furnace system that allows automatic switching between the two techniques for analyzing various types of samples. The system includes both air-acetylene and nitrous oxide-acetylene burners and is supplied with a high-capacity autosampler capable of handling up to 133 samples along with modifiers.
Key Features:
Background correction using deuterium lamp and self-absorption correction for enhanced measurement accuracy.
Wide wavelength range from 190 to 900 nm.
Automatic spectral bandwidth adjustment from 0.1 to 2.0 nm.
Electronic Sample Viewing (ESV) for real-time visual monitoring of samples.
Furnace temperature range from ambient to 3000°C, with heating ramp rates ≥2000°C/sec.
Automatic burner height adjustment and simultaneous use of both flame and furnace options.
Designed for high sensitivity and flexibility, the GeminAA Plus effectively performs a wide range of sample analyses. All gas settings are software-controlled, and the device features automatic ignition and real-time optimization of operating conditions.
This flame and graphite furnace combination system comes standard with air-acetylene and nitrous oxide-acetylene burners, and a universal flame/graphite furnace autosampler.
Advanced Optical System
GeminAA Plus is equipped with a unique suspension system that isolates the instrument from bench vibrations and ambient temperature changes, ensuring stable performance. It uses an 1800 lines/mm diffraction grating to enhance resolution and energy efficiency. The optical system is capable of detecting ultra-low detection limits for elements such as arsenic (As) and selenium (Se). It also includes a six-lamp turret with automatic lamp selection and deuterium background correction.
Integrated Design
GeminAA Plus features an integrated design that combines the optical system, atomizer, graphite furnace power supply, and electronic components into a single compact unit. This makes it one of the most space-efficient tandem AAS systems available. It also utilizes an optimized power supply to extend the life of hollow cathode lamps.
Automatic Switching Between Flame and Graphite Furnace
The system allows software-controlled automatic switching between flame and graphite furnace modes in less than 2 seconds. There is no need for manual replacement or adjustment of any components when switching between the two modes.
| Optical System | |
|---|---|
| Wavelength Range | 190 – 900 nm |
| Monochromator | Czerny-Turner Grating Monochromator |
| Wavelength Repeatability | ≤ 0.5 nm |
| Blaze Wavelength | 250 nm |
| Resolution | Better than 0.1 nm |
| Spectral Bandwidth | Automatic switching between 5 levels: 0.1, 0.2, 0.4, 1.0, 2.0 nm |
| Wavelength Accuracy | ±0.1 nm |
| Grating | 1800 lines/mm |
| Baseline Stability | ≤0.003A/30min ± (static); ≤0.002A/30min ± (dynamic) |
| Flame Method | |
| Copper (Cu) Standard Concentration | ≤ 0.2 μg/mL |
| Precision (RSD) | ≤ 6% |
| Position Adjustment | Adjustable height and angle; switch between flame and hydride system in less than 1 minute |
| Detection Limit | ≤ 0.03 μg/mL |
| Graphite Furnace Method | |
| Cadmium (Cd) Standard Concentration | ≤ 0 × 10⁻¹³ g |
| Temperature Range | Ambient to 3000°C |
| Temperature Control Program | Up to 20-step temperature programs; 3 heating modes: Flat, Slope, Step |
| Maximum Heating Ramp Rate | ≥ 2000°C/sec |
| Detection Limit | ≤ 0 × 10⁻¹³ g |
| Precision (RSD) | ≤ 2% |
| Optically Controlled Heating Ramp Rate | ≥ 3000°C/sec |
| Heating Modes | Maximum power heating and rapid heating with optical control |
