The working principle of the system
is based on the continuous flow method. First the mercury contained in the
sample is transformed into the elemental state by addition of a reducing agent
to the sample flow. In a crossflow reactor the mercury is stripped with a gas
stream and carried into the optical cell which is made entirely of fused silica.
There the quantitative determination of mercury is obtained by measuring UV
absorption at a wavelength of 253,7 nm at room temperature. This analytical
technique is commonly known as cold vapor atomic absorption spectrometry
(CVAAS), a method that has proved itself as extremely sensitive and selective
over many years. In contrast to a typical multi-element AAS the AULA is
specially designed for mercury determination. This allows top performance in
analytical applications. The use of a highly stable low-pressure electrodeless
mercury discharge lamp (EDL) in connection with the latest UV detector
techniques result in excellent baseline stability and low detection limits.
Surprisingly easy to use the AULA-WIN offers all features of a modern analytical
software. It has been developed with extensive input from our users. Samples,
calibration standards and quality control standards (QCS) are entered into the
carrousel screen. With an optional barcode stick sample data can be entered
comfortably. A sample table is created automatically and can be viewed in the
table screen. Sample dilution factors as well as sample weight and final fill up
volume for digestion of solid samples can be entered in the table. The result of
the measurement is calculated automatically from the chosen calibration function
and displayed in ?g/l or ?g/kg. The QCS function assures a high level of
reliability of the analytical results. The results of the analyses together with
the data necessary for quality assurance (date, time, user ID, sample number,
calibration data, instrument parameters) are stored in a file. They are
available at any time for display and printout. Worksheet templates can be
created and stored to minimize setup time for routine work. No long purging or
rinsing procedures even when samples with high concentrations are analyzed. The
typical duration of a full measurement cycle is 80 ... 280 seconds. The quick
screening mode allows performing analyses in even a shorter time.
?? Water, Waste, Soils and Effluents
?? Applicable to EPA Methods: 245.1,
245.7, 1631, 7470 and 7471A
?? Medicine (urine, blood, saliva,
hair)
?? Chemical industry (process
monitoring, quality control)
?? Geochemistry (geological and
mineralogical samples)
??
Petrochemistry
??
Metallurgy and material testing