Sequential-Injection Atomic Fluorescence Spectrophotometer ASF, <0.001 µg/L Hg/Cd Detection Limit (CAT#: STEM-AL-6998-ZJF)

This atomic fluorescence spectrophotometer is designed for trace elemental analysis of samples that form hydrides, gaseous species, or atomic vapor. It supports determination of the listed arsenic, germanium, selenium, lead, bismuth, tellurium, tin, antimony, cadmium, zinc, mercury, and gold analytes. The instrument uses a combined injection-pump and peristaltic-pump sampling system to deliver reagents and samples to the reaction and atomization path. A dual-channel optical arrangement permits simultaneous multi-element measurement and can be extended to additional channels as described in the source. Lamp identification, pulsed excitation, and channel-interference control are integrated into the measurement sequence. Gas-liquid separation and the quartz-furnace atomizer manage the reaction stream before fluorescence detection. Software functions cover instrument initialization, condition recall, measurement control, cleaning assessment, spectrum storage, and result output. Autosampler and elemental-speciation interfaces can extend the system for automated sample handling and additional analytical workflows.

Analytes As, Ge, Se, Pb, Bi, Te, Sn, Sb, Cd, Zn, Hg, And Au
Detection Limit As/Se/Pb/Bi/Sb/Te/Sn <0.01 µg/L
Detection Limit Hg/Cd <0.001 µg/L
Detection Limit Ge <0.05 µg/L
Detection Limit Zn <1.0 µg/L
Detection Limit Au <3.0 µg/L
Relative Standard Deviation <0.8%
Linear Range>3 Orders Of Magnitude
Inter-Channel Interference ≤±1%
Noise ≤1%
Drift ≤2%
Measurement Channels 2, Upgradable To 4
Element Lamp Inclination 45°
Injection Pump Syringe Life ≥800,000 Cycles
Injection Repeatability <1%
Aspiration/Dispense Accuracy <1%
Minimum Injection Volume 0.01 mL
Automatic Standard Preparation ≥8 Points From 1 High-Concentration Standard
Single-Point Automatic Standard-Curve Correlation r>0.9995
Peristaltic Pump 10 Rollers And 4 Channels
Sample Measurement Time <20 s
Pump-Tube Service Life>2 Times Conventional Tubing
Pinch-Valve Service Life Up To 2,000,000 Operations
Silicone Pinch-Tube Elasticity ≥100,000 Open/Close Operations
Four-Hour As/Sb Drift ≤2%
Carrier Fluorescence Deviation ≤10%
Detector Photomultiplier Tube With Service Life>10 Years
Autosampler Capacity 206 Positions With 200 × 10 mL Cups And 6 × 50 mL Cups
Autosampler Positioning Accuracy ±0.5 mm
Positioning Repeatability 0.3 mm
Sample Carryover <0.1%
Default Air-Isolation Volume 8 µL

Automatic Element-Lamp Identification
Pulsed Lamp Excitation And Current Monitoring
Sequential Sample And Reagent Routing
Pinch-Valve Flow Control
Drift Compensation
Channel-Interference Suppression
Dual Gas-Liquid Separation
Quartz-Furnace Atomization