ULR Sulfite Fluorescence Test Kit, 6-500 µg/L (ppb), 100 Tests

Gallery

Product #: 34250000

Unit Price Contact Hach

Control bisulfite dosing. Verify dechlorination. Protect your RO membranes.

The Hach™ ULR Sulfite Fluorescence Test Kit provides sensitive measurement of sulfite from 6 - 500 µg/L (ppb) for monitoring chemical dechlorination processes. Used with the portable DR1300 FL Fluorometer, the test enables immediate onsite measurement of residual sulfite to help operators confirm effective bisulfite dosing and protect chlorine-sensitive reverse osmosis membranes.

Accurate residual sulfite measurement helps operators balance two competing risks: too little bisulfite can leave residual chlorine that damages RO membranes, while unnecessary overdosing increases chemical consumption and operating cost.

Why measure sulfite at ultra-low levels?

Optimise sodium bisulfite dosing
Measure residual sulfite directly to help determine whether sufficient bisulfite is being added for effective dechlorination—without unnecessarily overdosing treatment chemical.

Protect RO membranes from residual chlorine
Use sulfite measurement alongside ultra-low-range free or total chlorine testing to verify the chemical dechlorination process and reduce the risk of oxidative membrane damage.

Gain confidence beyond ORP alone
Direct sulfite measurement provides quantitative confirmation of residual sulfite and can help avoid pH-related interference associated with relying on ORP measurements for bisulfite dechlorination control. Hach specifically identifies this as a benefit of the fluorescence method.

Measure 6 - 500 ppb sulfite
The ultra-low measurement range provides the sensitivity needed to monitor residual bisulfite after chemical dechlorination. Hach reports precision of 250.0 ± 5.0 µg/L sulfite at 95% confidence for the fluorescence test.

Test immediately at the process
The portable DR1300 FL allows sulfite to be measured onsite rather than transporting samples to a laboratory, supporting faster process-control decisions.

Applications
Ideal for clean-water applications using sulfite/bisulfite for chemical dechlorination, particularly:
• Reverse osmosis feedwater
• RO membrane protection
• Sodium bisulfite dechlorination
• Chemical dechlorination process control
• Residual sulfite monitoring
• High-purity and process water
• Desalination and membrane treatment systems
• Power, semiconductor, pharmaceutical, and other chlorine-sensitive processes