Direct COD, Nitrate and Nitrite Determination by Photometric Measurement in the UV Range

Universal VIS/UV-VIS spectrophotometers with a pioneering analytic functionality

The photoLab 7000 series melts „brilliant“ menu guidance, precision and convenience and can be universally employed in routine and general laboratory analytics applications

Routine measurements could not be easier: automatic bar code and automatic cuvette recognition for all cuvette sizes and forms

The OptRF method is called from the start menu

and the measured values are displayed directly

With WTW’s new spectrophotometer photoLab® 7600 UV-VIS and its optical reagent-free (OptRF) methods, COD, Nitrate and Nitrite in the effluent of municipal wastewater plants can be determinated without the need for any photometric reagents. This pioneering technology has been transferred to the laboratory from the WTW online spectral sensors.       

The sample is pipetted into a 10 mm quartz cuvette, measured spectrally in the UV range, and the measured value is displayed directly. Possible applications include quick daily monitoring, sample verification and preliminary tests of the optimal measuring range of test sets. It is also suited for the quick referencing of online measurements. While primarily recommended for the effluent of municipal wastewater plants, the OptRF procedure can be used for many surface waters too, if preliminary tests have been run accordingly. The OptRF measurement can be further optimized by reference measurement with test sets.

The advantages are obvious:

  • Faster than any digestion
  • Cost savings by reduced reagents consumption
  • No health-hazardous chemicals required
  • Environmentally friendly

Beyond the OptRF measurement, the new photoLab® series (photoLab® 7600 UV-VIS and photoLab® 7100 VIS) have retained the proven functionality of their predecessor models:

  • Self-explanatory menu guidance on a brilliant colour display
  • Bar codes for round and rectangular cuvettes (10, 20, 50 mm) with automatic measuring range switch allow cost-saving quality analytics
  • Automatic cuvette recognition without adaptor change for fast and error-free analysis.
  • Over 250 pre-programmed methods for routine analytics.
  • Extensive AQA (Analytical Quality Assurance) functions  for measured value reliability, user administration, system and matrix check
  • GLP compliant data transfer with LIMS-connection
  • Mobile use  is possible with standard car battery
  • IQ-LabLink for bi-directional data exchange with WTW’s online system IQ SensorNET
  • Brewery applications package
  • Ethernet interface

Complex multi-step and multi wavelength procedures, e.g. the supplied chlorophyll and glucose methods can be user-programmed by the user dialog-guidance making the photoLab® series spectrophotometers widely usable in laboratories, education and research.

For the quality control, from water to food and beverage, a new photometric colour measurement module, photoLab® Color, is available.

Request information now or download our brochure.


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