220nm & 275nm UV Bandpass Filters | Specialized Optical Components for Total Nitrogen Analysis
The OPTOStokes 220nm and 275nm ultraviolet (UV) bandpass filters are high-precision optical components specifically engineered for automated water quality analyzers and spectrophotometers. In environmental monitoring, determining Total Nitrogen (TN) requires precise ultraviolet photometric detection after alkaline potassium persulfate digestion. Our specialized UV filters provide the exact spectral isolation needed to measure nitrate ion absorbance while eliminating background interference from dissolved organic matter.
The Role of 220nm and 275nm Filters in Spectrophotometry
During the analytical process, organic nitrogen compounds are oxidized into nitrates. The nitrate ion exhibits a characteristic absorption peak at 220nm, whereas its absorbance at 275nm is virtually zero. Conversely, dissolved organic matter absorbs light at both 220nm and 275nm. By utilizing our dual-wavelength filter system, optical instruments can accurately measure the optical density (OD) at both wavelengths to calculate the corrected absorbance, ensuring high-sensitivity quantification of total nitrogen levels without visible or stray light contamination.
Technical Specifications
| Specification Parameter | 220nm Bandpass Filter | 275nm Bandpass Filter |
|---|---|---|
| Center Wavelength (CWL) | 220nm ± 2nm | 275nm ± 2nm |
| Peak Transmission (T) | Greater Than 20% | Greater Than 20% |
| Full Width at Half Maximum (FWHM) | 10nm ± 2nm | 10nm ± 2nm |
| Out-of-Band Blocking | 200nm to 1100nm at OD Greater Than 4 | 200nm to 1100nm at OD Greater Than 4 |
| Angle of Incidence (AOI) | 0 Degree | 0 Degree |
Industrial & Environmental Applications
These advanced uv bandpass filter solutions are optimized for high-reliability instruments deployed in industrial production and quality inspection sectors. Key applications includecontinuous water quality monitoring system (CWQMS), laboratory UV-Vis spectrophotometers, municipal wastewater testing equipment, and automated environmental matrix analysis platforms.
Customization and Manufacturing Excellence
As a global supplier of premium optical filters, OPTOStokes delivers world-class quality and technology. We support high-level customization, offering various shapes including circular discs, rectangular plates, and customized dimensions. Standard black anodized mounted rings can be integrated upon request. Our robust production lines ensure predictable lead times and excellent batch-to-batch spectral consistency, resisting the UV degradation common in standard optics.
Accelerate Your Analytical Precision
Instrument manufacturers frequently face challenges regarding UV coatings fading over time or broad out-of-band leakage compromising linearity. OPTOStokes resolves these technical barriers by providing high-durability coatings and rigid cross-talk suppression. We offer an extensive in-stock selection for rapid prototyping alongside flexible options for custom optical components. To discuss your spectral requirements, request sample transmission curves, or receive a commercial quote, please reach out to our engineering team at sales@optofilters.com.
