OIL-Wader and OIL-Wader Pro: Provides real-time in situ detection of dissolved aromatic hydrocarbons

OIL-Wader and OIL-Wader Pro - Provides real-time in situ detection of dissolved aromatic hydrocarbonsThe Chelsea Technologies Group's OIL-Wader and OIL-Wader Pro systems provide surveyors and regulators with real-time in situ measurement of dissolved Polycyclic Aromatic Hydrocarbon (PAH). The OIL-Wader comprises a CTG UviLux fluorometer and a Hawk handheld display and logging unit. CTG’s UviLux fluorometers detect UV fluorescence with industry-leading sensitivity and selectivity and have been optimised for minimal interference from water turbidity.

 

Data is displayed on the Hawk’s colour touchscreen and logged internally. If required, the Hawk can be programmed to apply a user calibration to the reported values. The Hawk also incorporates a GPS receiver so that all logged data can be position and time stamped.

 

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Applications

  • Pollution surveillance & investigative monitoring
  • Point source hydrocarbon pollution tracking
  • Hydrocarbon monitoring in ports and coastal areas
  • Road and airport apron run-off monitoring

Features

  • Real-time display dissolved aromatic hydrocarbon levels (in µg/l)
  • User set Red, Amber, Green (RAG) data warning display
  • Simple, single touch data logging (2Gbyte storage capacity)
  • Position and time stamping recorded data
  • Uses rechargeable or disposable batteries
  • High sensitivity

Introduction

CTG’s OIL-Wader and OIL-Wader Pro systems provide surveyors and regulators with real-time in situ measurement of dissolved Polycyclic Aromatic Hydrocarbon (PAH).  The OIL-Wader comprises a CTG UviLux fluorometer and a Hawk handheld display and logging unit. CTG’s UviLux fluorometers detect UV fluorescence with industry-leading sensitivity and selectivity and have been optimised for minimal interference from water turbidity.

 

Data is displayed on the Hawk’s colour touchscreen and logged internally. If required, the Hawk can be programmed to apply a user calibration to the reported values. The Hawk also incorporates a GPS receiver so that all logged data can be position and time stamped.

 

Examples of detectable compounds include:

  • Carbazole
  • Phenanthrene
  • Naphthalene (NDSA)
  • BTEX
  • Perylene
  • Pyrene (PTSA)
  • Benzo[a]pyrene

 

What is the difference between OIL-Wader & OIL-Wader Pro?

The OIL-Wader comprises a single CTG UviLux fluorometer and a Hawk handheld display and logging unit. The UviLux fluorometer can be factory-configured for either refined or crude PAH detection.

 

The OIL-Wader Pro includes an additional UviLux sensor for either refined and crude PAH determination, or for discriminating PAH from a high background of Coloured Dissolved Organic Matter (CDOM).   The second sensor in the OIL-Wader Pro provides inherent robustness to varying CDOM background, for example when correlating PAH levels across a wide range of locations.

How does it work?

Oil Wader Carbazole EEM

Carbazole fluorescence map indicating UviLux (refined) measurement window

 

CTG’s OIL-Wader and Oil-Wader Pro detect PAH fluorescence. When dissolved, PAH compounds absorb UV light and re-emit a fraction of this energy as fluorescence at longer wavelengths. Fluorescence intensity is directly proportional to PAH concentration. The technique is widely recognised as one of the most sensitive detection methods available.

Oil Wader Perylene EEM

Perylene fluorescence map indicating UviLux (crude) measurement window

 

CTG’s UviLux sensors use a stabilised UV LED light source and a photomultiplier detector to provide exceptional measurement sensitivities. By exciting fluorescence at deep UV wavelengths the UviLux fluorometers can detect smaller PAH compounds typically associated with weathered oils.

Configuration

The OIL-Wader comprises a UviLux fluorometer, a 5-metre cable (longer cables are available) and the Hawk handheld display and logging unit.

 

The OIL-Wader Pro provides two UviLux fluorometers, configured for refined and crude hydrocarbons, securely mounted in a frame for ease of deployment. Data streams from both fluorometers are combined and reported in real-time on the Hawk data logger.

 

The Hawk incorporates a rechargeable battery pack, charged via the USB cable supplied. If required, the rechargeable battery pack can be replaced with standard disposable cells. User programmable thresholds allow data to be presented in a Red, Amber, Green (RAG) format, so that the operator is clearly notified when PAH levels become significant. A plotting feature is also provided so that trends in the data can be clearly identified. 

Specification

In view of our continual improvement, the designs and specifications of our products may vary from those described.

 

UviLux Fluorometer

Size

Ø70 x 150mm 

Weight

800g 

 

UviLux Hydrocarbon Performance

  PAH fuel CDOM (crude)
Sensitivity (QSU)

0.06

0.03

Calibrated range (QSU)

600

600

Example compound: Sensitivity – range (ppb) BTEX*:
3.0-50,000
Perylene:
0.003-50

*BTEX is Benzene, Toluene, Ethylbenzene, p‑Xylene, m‑Xylene, o‑Xylene at equal ppb concentrations

 

Hawk handheld display and logging unit

Display

320 x 240 pixel qVGA backlitLCD 

Display size

70 x 50mm 

Size

210 x 110 x 45mm 

Weight

500g 

Memory capacity

2 Gbyte 

IP Rating

IP67

Operating temperature

-2 °C to 40°C 

Storage temperature

-40 °C to 70°C 

 

OIL-Wader

Battery Duration

4 hours continuous use

 

OIL-Wader Pro

Battery duration

2 hours continuous use 

Overall size mm

200 x 200 x 100 mm

Weight

2.5 kg