Mercury Lab-Analyzer LA-254

Rapid mercury determination in the laboratory
 
Mercury LabAnalyser LA-254: system with photometer (right) and reaction unit
FEATURES
Firmly adjusted optical system not requiring any additional adjustment
Short analysis times
Low reagent consuption
Automatic zero adjustment
For analyses to
DIN 38406-12 / EPA 7470A / EPA 7471A)
Measuring range 0.01 ppb ... 10 ppb
Peak method: mercury vapors cannot escape into the lab
Upgradable to VM-3000 Mercury Vapor Monitor
   

Fields of application

The LabAnalyzer 254 is used for quantitative determination of mercury in aqueous samples and sample digestions.

  • Water samples: drinking water, waste water, ground water, surface water, sea water
  • Soil and sludge samples
  • Geological sample material
  • Waste samples: glass, construction rumble, contaminated liquids, wood
  • Incineration plant monitoring: smoke gas scrubber water, smoke gas analysis (e.g. to VDI 3868-2 VE)
  • Monitoring of foodstuffs
  • Clinical samples: urine, saliva
  • Chemical industry: environmental protection and quality control
  • Petrochemical industry
  • Research 

Measuring principle

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 absoption at a wavelength of 254 nm. This method is commonly known as the "cold vapor atomic absorption spectroscopy (CVAAS)" method.

Figure: Schematic flow diagram of LabAnalyzer LA-254

 

Optimization of AAS technology

In contrast to a typical multielement AAS the LabAnalyzer 254 is specially designed for elemental mercury. This allows top performance in analytical appliacations. 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.


Operation and maintenance
The LabAnalyzers 254 is operated with a waterproof membrane keypad and a graphic LCD. Handling is extremely easy. 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.

Measurement of a sample
The sample is pipetted into an extractor and mixed with 0.5 ml of reducing agent, for example tin-II-chloride solution. The extractor is then connected to the LabAnalyzer 254 and the measurement is started by pressing a button. After 60 to 90 sec the result appears on the display and the device is ready for the next analysis. The system does not need to be purged, and the zero point is calibrated automatically before every measurement (auto zero).
 

Safety for the user
The mercury cannot escape into the working environment, as any free mercury is collected in a sulfurized activated carbon cartridge. If the cartridge needs replacement a message appears on the control panel. The analyzed sample no longer contains any mercury.

Short analyses
Even with high concentrations no lengthy purging time is required. After every measurement a zero calibration is carried out automatically (auto zero). The typical duration of a measurement including purging is 60 to 100 sec. over the entire measuring range.

Display of results
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.

Storage of analytical results and quality assurance
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.
 

LA-254 LabAnalyzer Technical Specifications
Measuring principle: UV-Absorption
Wavelength: 254 nm
UV source: electrodeless low-pressure mercury lamp (EDL), temperature-controlled
UV detectors: Silicon, UV-enhanced, temperarure controlled
Stabilization method: Double beam (reference beam) method
Optical cell: Fused silica (Suprasil), approx. 23 cm long
Optical cell heating: approx. 70°C
Measuring range: lowest range: 0...1 µg/L
highest range: 0...100 mg/l
Pump: long-life membrane pump
Air stream: 30 l/h, adjustable
Measuring range: 0.01 µg/l ... 10 µg/l (10 ppt ... 10 ppb) for 10 ml
Sensitivity: 5 ng/l or 0.05 ng
Sample volume: 2 ... 10 ml
Reducing agent: tin-II-chloride or sodiumborohydride
Display of readings: Graphic LCD with background illumination
Outputs: analog 4-20 mA, RS 232computer output, parallel Centronics printer output
Power Supply: 230 VAC/ 50-60 Hz (optional 115 VAC / 50-60Hz)
Power consumption: 35 W
Dimensions: 45 x 15 x 35 cm (Wx H x D) photometer section
24 x 48 x 27 cm (Wx H x D) reaction bottle section
Required floor space: approx. 70 x 50 cm (W x D)
Weight: approx. 10 kg

Using the LabAnalyzer-254 is easy:

 (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) Start measuring by a keypress


As a leading supplier of high precision analytical equipment, we strive at all times to offer top quality solutions. Our products are manufactured according to the ISO 9001 quality regulations.
 

Ankersmid M&C bvba,         Neerlandweg 21, B-2610 Wilrijk,        :  info@ankersmid-mc.be,  : (32) - 3/820 80 01,