Nitrate Tool
Continuous Nitrate Profiling for Borehole Fluids
The Nitrate Tool is a specialised instrument designed to record continuous profiles of nitrate levels in borehole fluids. Using a sealed system, the tool measures the attenuation of ultraviolet (UV) light at specific wavelengths where nitrate molecules strongly attenuate UV, while most other common molecules in borehole fluids do not.
To account for potential interference from Dissolved Organic Carbon (DOC), the tool incorporates a second optical bandpass filter to directly measure DOC levels. By alternating measurements between the two filters, the tool provides detailed data, ensuring accurate assessment of nitrate concentrations under varying conditions.
Where DOC levels are negligible (indicated by detector current >1800nA), the tool provides quantitative nitrate concentration values. In cases of significant DOC presence (<1800nA), the nitrate log is presented qualitatively as detector current (nA).
Features and Benefits
Specifications
- Dimensions: 1200mm (length) x 79mm (diameter), 84mm with flow diverter cowl
- Weight: 12kg
- Maximum Temperature: 80°C
- Maximum Pressure: 20MPa
- Output:
- Quantitative: mg/L NO3
- Qualitative: Counts Per Second (CPS)
- Conversion: mg/L NO3-N × 4.42 = mg/L NO3
Logging Conditions
- Logging Speed: <3m/min
Borehole Compatibility
- Minimum Diameter: >85mm (with cowl fitted, preferred)
- Maximum Diameter: 500mm
- Environment: Fluid-filled boreholes
- Lining: Suitable for unlined or lined boreholes
The Nitrate Tool is an essential instrument for monitoring water quality and nitrate levels in borehole fluids. Its advanced dual-filter system and reliable data output make it ideal for hydrogeological and environmental investigations, ensuring accurate results even in complex conditions.
