The LabAnalyzer 254 is used for quantitative determination of mercury in aqueous samples and sample digests.
First the mercury contained in the sample is stripped with an air stream and sucked into an optical cell made of fused silica. There the quantitative determination of mercury is obtained by measuring UV absorption at a wavelength of 254 nm. This method is commonly known as "cold vapor atomic absorption spectroscopy" (CVAAS).
In contrast to a typical multi-element AAS the LabAnalyzer 254 is specially designed for elemental mercury. This allows top performance in analytical applications. The use of a specially developed highly stable mercury lamp in connection with thermostat-controlled UV sensors results in a detection limit of a few ppt of mercury.
Memory effects are minimized and a high sample throughput is possible thanks to specially selected materials for sample gas conducting components and heating of the optical bench.
The LabAnalyzer 254 is operated with a waterproof membrane keypad and a graphic LCD. Handling is very simple. The LabAnalyzer 254 does not require auxiliary gases. The carrier gas flow required for the analysis is generated by a built-in membrane pump which is maintenance-free and has a long service life.
The sample is pipetted into a reaction flask and spiked with 0.5 ml reduction reagent e. g. Tin-II-Chloride solution. The flask is then inserted into the reaction unit of the LabAnalyzer 254. Measurement is started by a keystroke.
(1) Fill sample into
reaction flask and add 0.5 ml of reagent
(2) Attach reaction flask to reaction unit bubbler tube
(3) Close securing bracket of reaction unit
(4) Press key to start measuring
After 60 to 90 seconds the result of the measurement will be displayed on the photometer. The analyzer is now ready for the next analysis.
Purging of the system is not necessary.
An Auto-Zero is performed before each measurement.
The mercury cannot escape into the working environment, as any free mercury is collected in a sulfurized activated carbon absorber. If the cartridge needs replacement a message appears on the control panel.
The analyzed sample no longer contains any mercury.
Even with high concentrations no lengthy purging time is required. The typical duration of a measurement including purging is 60 to 100 sec. over the entire measuring range.
During the entire measurement the measuring signal is continuously displayed on the graphic display. An acoustic alarm is sounded to indicate the end of the measurement. In addition to the measurement signal curve over time, the peak value and the mercury concentration are indicated.
Together with the data necessary for quality assurance the results of the analyses are stored in the RAM of the built-in computer. They are available at any time, and an automatic print-out of this data is also possible.
UV absorption (CVAAS),
Wavelength = 253,7 nm,
Electrodeless low-pressure mercury lamp (EDL)
Reference beam method
Fused silica (Suprasil),
Length approx. 230 mm,
heated, approx. 45°
(liquid / solid sample)
tin-II-chloride or sodiumborohydride
2 to 10 ml
approx. 5 ng/l resp. 0,05 ng absolutely
230 VAC/50 Hz
(110 VAC/60 Hz option)
Required floor space:
approx. 70 x 50 cm (W x D)
approx. 10 kg
As a leading supplier of high precision analytical equipment, we strive at all times to offer top quality solutions. Our quality management system is certified according to ISO 9001.