1.1 Instrument Description
AA-1800H is a multifunctional atomic absorption spectrometer with
two background correction methods, D lamp background elimination
and self-absorption background deduction. It is a high precision
analytical instrument integrates flame atomic absorption
spectrometry (abbreviated as FAAS), and hydride generation atomic
absorption spectrometry (abbreviated as HG-AAS), and graphite
furnace atomic absorption spectrometry (abbreviated as GFAAS), and
atomic emission spectrometry (abbreviated as AES). An auto-sampler
is optional to equip with graphite furnace atomic absorption
spectrometry. AA-1800H is widely used in geology, metallurgy,
mining, petroleum, chemical industry, mechanical, agriculture, food
industry, medicine, health, antiepidemic, environmental protection,
and other industries. And it is an essential high precision
analytical instrument for scientific research institutes, colleges
and universities, and related enterprises.
AA-1800H can be used for analyzing metallic elements, amphoteric
elements, and alkali elements. It’s a high precision analytical
instrument with high performance and its determination range can be
from ppb to ppt. Following are the features of AA-1800H:
- Advanced determination of flame atomic absorption spectrometry
It is developed by experienced professors and senior engineers who
are engaged in analytical instrument industry of atomic absorption
spectrometry for many years. The background correction with
Deuterium hollow cathode lamp can eliminate the interference of
molecular absorption in low content determination. The detection
sensitivity is greatly improved, and the value is less than 0.015
μg/ml/1%.
- High detection sensitivity and low detection limit of hydride
generation atomic absorption spectrometry
The import known-how such as the advanced pneumatic component
theory, and high performance hollow cathode lamp guarantees the
hydride generation atomic absorption spectrometry performing a high
detection sensitivity and low detection limit. For example, the
detection sensitivity of Arsenic element is better than 0.08
ng/ml/1%. The instrument precision is also greatly improved.
- Convenient software operation system provides reliable data
processing result
The data processing system of AA-1800H is an application of new
data processing achievement in the field of atomic absorption
spectrometry. It provides reliable data processing result.
Meanwhile, the special designed operation software system is
advanced and convenient.
- A partly substitution of graphite furnace atomic spectrometry
The atomic absorption spectrometry together with on-line enrichment
by the pneumatic flow injection system designed by ourselves can
determine some elements and obtain a high sensitivity, that means
it is a partly substitution of graphite furnace atomic spectrometry
for certain elements. Thus, it not only reduces the testing cost,
but also improves the instrument utilization.
- Special designed double-loop power supply for the high performance
hollow cathode lamp
AA-1800H uses special designed double-loop power supply for the
high performance hollow cathode lamp, which is convenient for lamp
adjusting. It not only improves the lamp energy of some element,
but also improves the detection sensitivity to several times. And
the performance indexes of the instrument such as stability and
detection sensitivity are greatly improved.
- Unique micro-volume sampler with constant current pulse
A unique micro-volume sampler with constant current pulse that
designed based on the pneumatic component theory is optional to
equip with flame atomic absorption spectrometry. The sample volume
can be reduced to 0.1 ml, however, there is few influence on the
detection sensitivity. And a relative standard deviation about of
1% can be obtained. Thus, it is very significant to medicine and
health care industry.
- Innovative detection system
Innovative atomic absorption detection system guarantees the
instrument having an excellent stability. For a non-zeeman atomic
absorption spectrometer, the detection precision of 0.0001A makes
it to be unique.
The instrument is controlled by the USB port of computer, which is
an advanced communication method. User can choose the computer as
required, and that is also available for other laboratory use.
However, to avoid viruses, please don’t use this computer for
internet surfing.
1.3 Instrument Specifications
The instrument specifications are described in the following table:
| Items | Specifications | |
| Monochromator: | | |
| Wavelength Rage: | 190 nm ~900 nm | |
| Wavelength Accuracy: | ≤0.15 nm | |
| Grating: | 1800 lines/mm | |
| Optical System: | C-T | |
| Blazed Wavelength: | 250 nm | |
| Focal Length: | 280 nm | |
| Reciprocal Linear Dispersion: | 2 nm/mm | |
| Bandwidth: | 1 mm / 0.2 mm / 0.05 mm, selectable | |
| Detection Sensitivity: | | |
| FAAS: | Cu: ≤0.05 μg/ml | |
| GFAAS: | Cd: ≤1 pg, Cu: ≤80 pg | |
| Detection Limit: | | |
| FAAS: | Cu: ≤0.008 μg/ml | |
| GFAAS: | | |
| Measurement Repeatability(RSD): | | |
| FAAS: | Cu: ≤1% | |
| GFAAS: | Cd: ≤5%, Cu: ≤4% | |
| Stability (Baseline Drift): | ≤ 0.005 A/30min | |
| Detection System: | | |
| Photomultiplier (MPT): | R928 / R955 | |
| Negative High Voltage: | 150 V ~ 800 V | |
| Gain: | ×1, ×2, ×4 | |
| Light Source: | | |
| Lamps: | HCL, HPHCL, Dz | |
| Lamp Position: | No. 1 ~ No. 4: HCL | |
| No. 5 , No. 6: HPHCL | |
| Independent holder: Dz | |
| Lamp Current: | HCL: 0.5 mA ~ 9.9 mA | |
| HPHCL: 0.5 mA ~ 9.9 mA (main current), 0.5 mA ~ 9.9 mA (auxiliary current) | |
| Dz: 0.5 mA ~ 19.9 mA | |
| Flame atomization System: | | |
| Nebulizer: | Glass nebulizer with metal sheath designed by Mr. Wu | |
| Burner: | 100 mm Steel of Titanium alloy | |
| Flame Ignitor: | Electronic pulse ignition | |
| Gas Flow Path: | Dual-channel designed, automatic security device with fuel gas
flameout system | |
Items | Specifications | |
| Graphite furnace atomization System: | | |
| Temperature control range: | Room temperature ~ 3000℃ | |
| Programmed temperature control: | Up to 20 stages, ramp and step heating | |
| Drying stage: | Up to 8 stages, each 4 stages for ramp and step heating, each stage
0~99 s duration time | |
| Ashing stage: | Up to 8 stages, each 4 stages for ramp and step heating, each stage
0~99 s duration time | |
| Atomization stage: | Ramp and step heating, 0~20 s duration time | |
| Clear stage: | Ramp and step heating, 0~20 s duration time | |
| Heating mode: | High power heating, and optically controlled high power heating
with the temperature range of 1500℃~3000℃, with graphite tube
temperature self calibration function | |
| Temperature accuracy: | ≤1% | |
| Heating rate: | ≥2000 ℃/s | |
| Security arrangement: | Cooling water flow: ≤0.75 L/min (Cooling water supply: ≥0.75 L/min) | |
| Alarm, and automatically stop heating program when following
situation occurs: argon pressure <0.3 MPa, or cooling water
temperature ≥60℃ | |
| Heating program is not allowed when bad contact of graphite tube
occurs | |
| Over current protection | |
| With the graphite tube usage recording function to remind users to
replace the graphite tube when it reaching its service life | |
| Gas control: | Internal gas: 0~300 ml/min, with the internal of 20 ml/min | |
| External gas: 0, or 1.5 L/min (The external gas is supplied with
certain flow of during the four heating stages of drying, ashing,
atomization and clear, and there are three kinds of cooling times
for chosen, 15 s, 30 s, 45 s. Besides, the external gas is shut
off) | |
| Graphite tube type: | Ordinary, pyrogenic and platform graphite tubes | |
| Graphite tube fixing: | Pneumatic switch controlled by computer, stable and safe, with good
contact. | |
| Signal Processing: | | |
| Signal Output: | Total absorbance, net absorbance, background absorbance | |
| Calculation methods: | Average, peak height, peak area | |
| Readings: | Absorbance: 0.001~2.000, 0.0001~2.0000, Concentration:0.001~9999 | |
| Calibration methods: | 4 fitting methods, each curve up to 10 points | |
| Statistics: | SD, RSD, precision | |
| Background correction methods: | D lamp background elimination, self-absorption background deduction | |
| Dimensions: | | |
| Main Structure: | 988 mm× 412 mm× 440 mm (L×W×H) | |
| Power Supply of Graphite Furnace: | 430 mm× 412 mm× 400 mm(L×W×H) | |
| Auto-sampler: | 306 mm× 278 mm× 440 mm(L×W×H) | |
