Atomic Absorption Spectrophotometer | Flame & Graphite Furnace AAS TAS990

Engineered for elemental trace quantification across environmental monitoring, food testing, geochemistry, pharmaceuticals, and metallurgical sectors, this atomic absorption spectrophotometer delivers multi-element detection across an expansive 190 nm to 900 nm spectral band. Featuring seamless automated switching between flame and electrothermal graphite furnace atomization, the platform enables flexible routine screening alongside ultra-trace sub-ppb detection.

High-Throughput Optical Bench and Automated Lamp Configuration The optical assembly features a high-throughput Czerny-Turner monochromator equipped with an 1800 lines/mm holographic diffraction grating, delivering exceptional wavelength accuracy of ±0.25 nm and resolution of 0.2 nm ± 0.02 nm. Light attenuation and spectral background interferences are eliminated via dual background correction mechanisms: a continuous-emission Deuterium Arc lamp and high-performance pulse-driven Self-Reversal background correction exceeding 55 times correction capability. A motorized 8-hollow cathode lamp turret executes automated positioning, multi-lamp preheating, and optical optimization under complete software automation.

Dual Atomization with Transversely Heated Graphite Furnace The electrothermal atomization system utilizes advanced transverse graphite furnace heating, ensuring uniform isothermal heating along the optical path. This design minimizes chemical matrix interferences and suppresses memory effects across wide temperature ramps from ambient up to 2650°C. For flame analysis, a robust, corrosion-resistant titanium alloy burner head supports Air/Acetylene, Nitrous Oxide/Acetylene, and Air/Propane gas configurations, coupled with automated gas flow regulation and high-efficiency nebulization.

Integrated Safety Interlocks and Flexible Analytical Accessories Operational safety is ensured by real-time hardware interlocks that continuously monitor oxidant support pressure, fuel flow rates, drain liquid levels, flame sensors, and burner head positioning switches. For electrothermal runs, the system instantly terminates heating if argon gas pressure, water chiller circulation flow, or graphite tube physical integrity is compromised. Productivity is expanded via autosamplers supporting automated standard additions, matrix modifier injection, and automated online enrichment for ultra-low concentration samples, as well as dedicated hydride generators for hydride-forming elements.

Technical Specifications

Frequently Asked Questions (FAQ)

1. How does the system transition between flame and graphite furnace modes? The instrument features automated mechanical positioning that shifts between flame and graphite furnace atomizers via software commands without manual optical realignment.

2. What are the operational advantages of transverse graphite furnace heating? Transverse heating creates an isothermal temperature profile throughout the graphite tube, eliminating cold ends, reducing chemical interferences, and preventing sample memory effects.

3. What background correction options are available for complex sample matrices? The analyzer provides both a Deuterium Arc lamp and high-speed Self-Reversal background correction, delivering over 55-fold correction capability for high-absorbance interferences.

4. What elements can be determined using the dedicated hydride generation accessory? The hydride generator is optimized for ultra-trace quantification of volatile hydride-forming elements including arsenic, selenium, lead, bismuth, antimony, tellurium, tin, germanium, and cold vapor mercury.

5. What automated safety interlocks protect personnel during flame atomization? Integrated safety systems monitor oxidant support pressure, drain liquid trap sensors, burner installation interlocks, flame status monitors, and an emergency flame kill switch.

6. What protective measures prevent damage to the graphite furnace module? The furnace controller monitors argon carrier gas pressure and external cooling water flow rates, automatically cutting power if pressure drops or if a graphite tube fractures.

7. How does the flame autosampler handle low-concentration samples?

The flame autosampler supports automated routine calibration and sample introduction alongside automated online pre-concentration and elution for low-level target analytes.

8. What capabilities are integrated into the graphite furnace autosampler?

The autosampler executes automated multi-point standard curve generation, matrix modifier additions, intelligent sampling depth adjustments, and air-barrier liquid isolation to prevent cross-contamination.

9. Why is a dedicated temperature-controlled water chiller required for graphite furnace analysis?

A circulating water chiller ensures high-efficiency cooling, maintains uniform furnace temperature repeatability, and prevents internal mineral scaling caused by untreated tap water.

10. What are the benefits of using an oil-free air compressor with the flame unit?

An oil-free compressor delivers clean, oil-free, dry compressed air to the burner, preventing carbon contamination in the mixing chamber and avoiding erratic flame baseline fluctuations.

11. What is the capacity and operating function of the automated lamp turret? The motorized turret accommodates 8 hollow cathode lamps simultaneously, allowing automated optical line peaking, position optimization, and automated element warm-up sequences.

12. Which flame chemistry types are supported for refractory element analysis? The titanium burner supports standard Air/Acetylene, high-temperature Nitrous Oxide/Acetylene for refractory elements like barium and aluminum, and Air/Propane (LPG) mixtures.