UviLux FDOM

Highly sensitive UviLux FDOM fluorometer for detection of fluorescent dissolved organic matter (FDOM).

UviLux sensors enable high sensitivity, real-time, in situ measurement of fluorescent dissolved organic matter (FDOM). These compact and robust fluorometers have excellent turbidity rejection and high ambient light rejection, making them suitable for use in water and wastewater treatment works, as well as natural waters at the surface and to depths of up to 1000 m

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Highly sensitive UviLux FDOM sensor for the detection of fluorescent dissolved organic matter in water

Overview

UviLux FDOM Sensors

UviLux sensors enable high sensitivity, real-time, in situ measurement of fluorescent dissolved organic matter (FDOM). These compact and robust fluorometers have excellent turbidity rejection and high ambient light rejection, making them suitable for use in water and wastewater treatment works, as well as natural waters at the surface and to depths of up to 1000 m.

Features & Applications

Key features

  • In-situ, real time monitoring of FDOM
  • Highly sensitive readings to 0.03 ppb
  • Easy to integrate with monitoring platforms and systems, or combine with Hawk for on the spot readings and logging
  • Depth rated to 1000m
  • Excellent turbidity rejection and high ambient light rejection
  • Ideal for use with other UviLux sensors to remove environmental interference
  • Service and support from dedicated technical team

Applications

  • Real time monitoring of FDOM in groundwater, rivers and lakes
  • Assessment of water quality in catchments and natural waters

Specifications

UviLux sensor technical specification

Parameters CDOM/FDOM
Sensitivity (QSU) 0.01
Calibrated range (QSU) 600
Example compound:
sensitivity range (ppb)
PTSA:***0.02 – 900

 

Mechanical

Size Ø 70 mm x 149 mm
Weight in air 800 g in air / 150 g in water
Pressure housing Acetal C
Operating temperature -2 °C to + 40 °C
Storage temperature -40 °C to + 70 °C
Depth rating 1000 m
Connector Impulse MCBH6MP

Electrical

Input voltage 9 – 36 V
Power requirements < 1 Watt @ 12 V

The sensitivity and calibrated range of each UViLux sensor has been standardised by cross-correlating each calibration solution against a certified reference standard of quinine sulphate using a bench-top spectrofluorometer.

Fluorescence is reported in Quinine Sulphate Units (QSU), where 1 QSU is equivalent to the fluorescence intensity recorded from 1 ppb quinine sulphate at an excitation wavelength of 347.5 nm and an emission wavelength of 450 nm. Factors are provided for selected compounds to convert the fluorescence output from QSU to ppb of the compound of interest

FAQs

What is CDOM/FDOM?

CDOM/FDOM is interchangeably known as coloured dissolved organic matter or fluorescent dissolved organic matter. They refer to the parameter that can be measured in aquatic environments as a product of decaying material. FDOM is largely a subset of DOM, or dissolved organic matter.

FDOM contributes to light absorption and may also help fuel bacterial respiration because of the large quantities of carbon, nitrogen and phosphorus that it carries. This may indirectly contribute to eutrophication, a natural process typically involving increases in nitrogen and phosphorus that fuel aquatic plant growth and lead to the eventual filling-in of water bodies. Evidence suggests that FDOM may also affect nutrient availability for algae growth, and may also impact algae by limiting the amount of light they can absorb by clouding waters.

upstream salmon farmFDOM typically contain chromophores that absorb UV and visible light, hence the term Chromophoric (or coloured) Dissolved Organic Matter. FDOM will fluoresce after light absorption, allowing researchers a way to detect and quantify its abundance in water systems using fluorometry. Detection of FDOM levels in water systems greatly increases the power of monitoring efforts and helps explain events such as a sudden decrease in primary productivity, phytoplankton regime shifts, algal blooms, and changes in an environment.

Along with turbidity and chlorophyll, FDOM is also an important consideration for determining light attenuation in a water body, the loss of light with depth and is commonly used to set minimum light requirements and maximum depth targets in determining sustainability and restoration goals.

Do I need to monitor tryptophan too?

In practice, Chelsea Technologies recommends combining the UviLux FDOM with the UviLux Tryptophan, to allow differentiation between FDOM signal and Tryptophan signal. FDOM and Tryptophan signal does overlap, and the use of multiple sensors will give more differentiated datapoints.

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