Measure a known scavenger—not dissolved oxygen
Check the residual concentration of a known oxygen-scavenging treatment agent using Hanna’s HI96773 chemistry and the matching photometer program. The same reagent family supports separate calibrations for carbohydrazide, DEHA, hydroquinone and iso-ascorbic acid, so selecting the correct agent is part of the measurement—not an optional label change. HI96773-01 is the verified 50-test refill for these methods on HI83300, HI83305 and HI83399. It is not a dissolved-oxygen reagent kit and does not identify an unknown treatment mixture.
Official HI96773-01 reference packaging. The method uses powder A and liquid B; photographed items do not define retail bottle inventory.
Check the exact catalog number and method
Confirm the treatment agent is known, then select its dedicated Oxygen Scavengers method on HI83300, HI83305 or HI83399. Do not substitute HI93732 dissolved-oxygen or HI93704 hydrazine reagents. Only the 50-test HI96773-01 option is offered here.
Four calibrations with different reporting ranges
The current instrument manuals specify carbohydrazide at 0.00–1.50 mg/L, DEHA at 0–1000 µg/L, hydroquinone at 0.00–2.50 mg/L, and iso-ascorbic acid at 0.00–4.50 mg/L. The DEHA result uses micrograms per liter rather than the milligrams per liter used for the other agents. Each result is expressed as the selected compound. The iron-reduction chemistry is a measurement method for a known agent, not a selective identification test for an unknown or mixed formulation.
Budget reagents for both the blank and the sample
These methods use two cuvettes: one with 10 mL of deionized water for the reagent blank and one with 10 mL of sample. Each receives one packet of HI96773A-0 and 0.5 mL of HI96773B-0, for a total of two A packets and 1 mL of B per blank/sample analysis. These quantities describe analytical consumption, not the number or fill volume of bottles in the retail box. Keep suitable deionized water and the required cuvettes available separately.
Use the timer belonging to the selected agent
Carbohydrazide, DEHA and iso-ascorbic acid use the specified 10-minute development interval; hydroquinone uses 2 minutes. After the prescribed reaction interval, the prepared blank is used for zeroing and the prepared sample is read according to the model manual. A universal wait time would be inappropriate. Build the correct program, reagent additions, mixing and timing into the operating procedure, and review the full method’s interference information when the process-water matrix changes.
Keep the safety information with the test station
The actual US SDS for HI96773A-0 and HI96773B-0 are linked with the instrument method references. Reagent B is classified as corrosive and can cause severe skin burns and eye damage; its sheet calls for suitable gloves, protective clothing and eye/face protection. Store B sealed in its original container in a ventilated, dry place away from ignition sources and incompatible materials. Hanna identifies HI96773-01 as Dangerous Goods with ground-only shipping. No shipping claim is made for an unverified larger pack.
Frequently Asked Questions
Does this measure dissolved oxygen in water?
No. It measures the selected oxygen-scavenging chemical using its corresponding photometer calibration. It is not HI93732 dissolved-oxygen reagent and does not report a dissolved-oxygen concentration.
Can the kit tell me which scavenger is in an unknown sample?
No. Know the treatment chemistry before selecting carbohydrazide, DEHA, hydroquinone or iso-ascorbic acid. The method does not establish selective identification or separation of unknown mixed-agent formulations.
What range applies to each agent?
The current manuals list 0.00–1.50 mg/L as carbohydrazide, 0–1000 µg/L as DEHA, 0.00–2.50 mg/L as hydroquinone and 0.00–4.50 mg/L as iso-ascorbic acid. Use the selected compound’s range and units rather than applying one scale to all four.
Do all four methods have the same reaction time?
No. Carbohydrazide, DEHA and iso-ascorbic acid use 10 minutes; hydroquinone uses 2 minutes. Follow the exact model manual for mixing, countdown, blank zeroing and sample reading.
Why does one determination need two cuvettes?
One cuvette contains 10 mL of deionized water for the reagent blank; the second contains 10 mL of sample. Both receive reagent A and B. The total method consumption is two A packets and 1 mL of B, split as one packet and 0.5 mL per cuvette.
Are bottle counts or a larger pack included in this offer?
This offer is HI96773-01 with 50 nominal tests only. Analytical dosing quantities must not be used to infer physical retail bottle counts or fill volumes. A larger catalog entry appearing in a manual is not a verified current US offer and is not selectable here.
Which instrument and method should I select?
The current HI83300, HI83305 and HI83399 manuals list this reagent family for the four named Oxygen Scavengers methods. Select the exact known-agent program. Hydrazine uses a separate method and reagent family; HI93704 is not interchangeable.
What protection and shipping restrictions apply?
Review both US component SDS PDFs before handling. Reagent B is corrosive; the SDS specifies gloves, protective clothing and eye/face protection. Keep it sealed, dry and ventilated away from ignition sources as directed. Hanna classifies this 50-test offer as Dangerous Goods and restricts it to ground shipping.
