flame， graphite furnace ，atomic absorption spectrometer

This type of AAS  that integrates both flame atomic absorption spectrometry and graphite furnace atomic absorption spectrometry. Professors Wu Tingzhao and Chen Lianyuan, who developed this instrument, have been engaged in the atomic absorption field in China for many years and have experience in developing various models of instruments. They combined their years of experience in the field of atomic absorption spectroscopy.

I. Detection methods of atomic absorption spectrometer and theoretically measurable trace elements (for reference only):

1. Flame Atomic Absorption Method:

The flame atomic absorption method (air-acetylene) can detect elements at the PPM level. Elements include: Sodium (Na), Potassium (K), Magnesium (Mg), Calcium (Ca), Chromium (Cr), Manganese (Mn), Iron (Fe), Cobalt (Co), Nickel (Ni), Platinum (Pt), Gold (Au), Copper (Cu), Silver (Ag), Zinc (Zn), Cadmium (Cd), Lead (Pb), Bismuth (Bi), etc.

2. Hydride Atomic Absorption Method:

The hydride atomic absorption method can detect trace amounts of low-melting-point elements (PPb level). Elements detectable include: Arsenic (As), Selenium (Se), Antimony (Sb), Bismuth (Bi), Lead (Pb), Tin (Sn), Tellurium (Te), Germanium (Ge), Mercury (Hg), etc. (A hydride generator needs to be purchased separately.)

3. Graphite Furnace Atomic Absorption Method:

The graphite furnace atomic absorption method uses a small sample amount and offers high sensitivity (PPb level). Elements detectable include: Silver (Ag), Aluminum (Al), Arsenic (As), Gold (Au), Barium (Ba), Beryllium (Be), Bismuth (Bi), Calcium (Ca), Cadmium (Cd), Cerium (Ce), Cobalt (Co), Cesium (Cs), Copper (Cu), Dysprosium (Dy), Erbium (Er), Europium (Eu), Iron (Fe), Gallium (Ga), Holmium (Ho), Indium (In), Potassium (K), Lanthanum (La), Lithium (Li), Magnesium (Mg), Manganese (Mn), Molybdenum (Mo), Sodium (Na), Nickel (Ni), Platinum (Pt), Osmium (Os), Lead (Pb), Palladium (Pd), Praseodymium (Pr), Hafnium (Hf), Rubidium (Rb), Rhodium (Rh), Ruthenium (Ru), Antimony (Sb), Scandium (Sc), Selenium (Se), Samarium (Sm), Tin (Sn), Zirconium (Zr), Tellurium (Te), Titanium (Ti), Vanadium (V), Zinc (Zn), Silicon (Si), etc.

2. Technical Specifications

2.1 Spectral System

2.1.1 Grating Lines: 1800 lines/mm.

2.1.2 Wavelength Range: 190-900 nm.

2.1.3 Spectral Bandwidth: Eight automatic adjustable options: 0.1、0.2、0.4、0.6、0.7、1.0、1.4、2.0nm.

2.1.4 Wavelength Accuracy: ≤0.15 nm; Wavelength Repeatability: ±0.05 nm.

2.1.5 Baseline Drift: Static ≤0.002 A/30 min, Dynamic ≤0.004 A/30 min.

2.1.6 Light Source: Eight-lamp automatic switching turret, automatic alignment.

2.1.7 High-performance Power Supply: Built-in high-performance dual-cathode lamp power supply.

2.2 Flame Atomizer

2.2.1 Characteristic Concentration (Cu): 0.015 μg/mL/1%.

2.2.2 Detection Limit (Cu): 0.002 μg/mL.

2.2.3 Precision: RSD ≤0.5%.

2.2.4 Burner Head: Titanium metal burner head.

2.2.5 Nebulizer: Wu high-efficiency glass nebulizer.

2.2.6 Nebulization Chamber: Explosion-proof high-polymer material nebulization chamber.

2.2.7 Adjustment System: Fully automatic PC-controlled flame/graphite furnace switching, automatic optimization, automatic ignition.

2.2.8 Safety Protection: Automatic safety protection, anti-backfire automatic gas circuit protection, acetylene leak alarm, automatic shutdown system, automatic power-off in case of anomalies.

2.3 Graphite Furnace Atomizer

2.3.1 Characteristic Quantity (Cd): 0.3 × 10^-12 g.

2.3.2 Detection Limit (Cd): 0.2 × 10^-12 g.

2.3.3 Precision: RSD ≤2%.

2.3.4 Heating Method: Longitudinal heating.

2.3.5 Safety Protection: Protection for water flow, water temperature, gas pressure, graphite tube poor contact, overcurrent, and power alarm.

2.3.5 Conversion Method: Flame/graphite furnace automatic switching integrated machine, electronically controlled moving platform via software, no manual disassembly required.

2.3.6 Heating Temperature Control: Room temperature to around 3000°C, fully automatic control in 20 levels, in-furnace enrichment up to 20 times, 4 heating modes, vertical optical monitoring of graphite tube inner wall temperature.

2.4 Background Correction

2.4.1 Flame: Deuterium lamp Self-absorption background correction: capable of correcting 1 A background.

2.4.2 Graphite Furnace: Deuterium lamp Self-absorption background correction: capable of correcting 1 A background.

2.5 Data Processing

2.5.1 Measurement Methods: Flame method, graphite furnace method, hydride method.

2.5.2 Concentration Calculation Methods: Standard curve method (1–3 curves), automatic fitting, standard addition method.

2.5.3 Repeat Measurements: 1-99 times, calculate average, provide standard deviation and relative standard deviation.

2.5.4 Result Printing: Parameter printing, data result printing, graph printing, exportable to WORD and EXCEL documents.

2.5.5 Full Chinese interface, simple and convenient operation, automatic switching between flame atomizer and graphite furnace atomizer can be realized through software operation.