|
 |
LAMPS FOR ATOMIC ABSORPTION
|
|
DESIGN
High Intensity Electrodeless Discharge Sources (HI EDS) are intended for use in atomic absorption spectrometers. A typical HI EDS includes a HF lamp itself, a compact HF generator (100 MHz), and a cooler. Only an external HI EDS compact power supply (32 V, 1 A) is to be provided. The design allows the HI EDSs to be used in various types of Atomic Absorption Spectrometers.
ELEMENTS
The HF lamps are filled with volatile elements, such as Cd, Zn, Hg, Ga, Se, Bi, Te and with some other as well:
As, Pb, Sr, Sb, Sn, Tl.
FILLING
The HF lamps are filled with inert gases (Ar, Kr, or Xe), pure elements, compounds and/ or their combination, such as
Pb + PbJ, Sr + SrJ + Cd, and TlJ. Such a filling allows high intensity radiation to be obtained with a low reabsorption of resonant lines.
DETECTION LIMITS FOR AAS
Detection Limits (DL) achievable in the Zeeman atomic absorption spectrometry using high frequency modulated light polarization (ZAAS-HFM) technique, employed in a Lumex MGA-915 spectrometer with HI EDS and Hollow Cathode Lamps (HCL), are compared in table .
| AVERAGE INTENSITY
|
| Element |
Wavelength, nm |
Intensity,
1012 fot/sec cm2 |
Power, supply voltage, V |
| As |
194 |
6 |
32 |
| Bi |
307 |
30 |
21 |
| Cd |
229 |
60 |
20 |
| Hg |
254 |
60 |
10 |
| Pb |
283 |
2 |
32 |
| Se |
196 |
6 |
26 |
| Sn |
286 |
8 |
28 |
| Te |
214 |
30 |
28 |
| Tl |
278 |
20 |
26 |
| Zn |
214 |
60 |
30 |
|
| AVERAGE INTENSITY
|
| Productnumber |
Element |
Wavelength,
nm |
DL
with HC, pg |
DL
with HI EDS, pg |
| 519033 |
As |
194 |
200 |
20 |
| 519083 |
Bi |
307 |
15 |
12 |
| 519048 |
Cd |
229 |
0.4 |
0.1 |
| 519035 |
Hg |
254 |
|
60 |
| 519036 |
Hg |
254 |
|
20 |
| 519082 |
Pb |
283 |
6 |
2.5 |
| 519051 |
Sb |
207 |
|
8 |
| 519034 |
Se |
196 |
150 |
20 |
| 519050 |
Sn |
286 |
30 |
2 |
| 519081 |
Tl |
278 |
15 |
8 |
| 519030 |
Zn |
214 |
0.4 |
0.05 |
| 307 |
80 |
10 |
|
| AVERAGE INTENSITY
|
| Element |
Working time (h), more than: |
| Cd, Hg, Sb, Tl |
800 |
| Bi, Sb, Se, Te, Zn |
600 |
| As, Pb, Sn, Sr |
400 |
|
POWER REQUIREMENTS
ac single-phase 110 – 240 V mains, 50 – 60 Hz, max. 0.3 A
DIMENSIONS
Diameter Dx: 1.5’’ (37.5 mm), 1.65’’ (41 mm), 2’’(51 mm)
Length: 4.7" (119 mm)
|
|
|
|
|