Prepare the COD blank with the specified water.
Keep one 250 mL bottle of Hanna HI70436M deionized water ready for method-directed blank preparation. The HI97106 manual explicitly lists this catalog number and bottle volume among its accessories; the water supports the blank workflow and is not itself a COD reagent kit.
Official Hanna HI70436M 250 mL bottle reference photo. Label lot and expiration details are illustrative, not a guarantee for supplied stock.
Check the exact catalog number and method
This page is only for HI70436M: one 250 mL bottle. It is not the 230 mL HI740230 bottle or the 1G HI70436 offering. Check your complete method’s water-quality requirement rather than assuming every deionized water application has the same purity specification.
A bottle volume, not a test-count promise
The supplied quantity is 250 mL in one bottle. Consumption depends on the blank, any validated dilution, rinsing and your laboratory’s contamination controls. Do not interpret 250 mL as 250 tests or as a guaranteed number of reportable COD determinations.
Use the COD reference for the procedure
For HI97106 COD methods, prepare the deionized-water reagent blank using the exact method’s specified volume, reagent lot and digestion sequence. The linked HI97106 document is an instrument method reference for COD blank preparation, not a dedicated instruction manual for this water bottle.
Protect the water between uses
The manufacturer describes an air-tight seal and lot/expiration identification. Preserve container identification and follow the bottle label and laboratory procedure when dispensing. Prevent contact with used pipettes, sample residues and reagent-contaminated equipment; do not return dispensed water to the bottle.
Keep water quality claims specific
No numerical grade, resistivity, sterility, pyrogen, calcium-free or other ultra-purity specification is established here. If a method needs a measured purity limit, confirm it with Hanna before use. Deionized does not by itself demonstrate universal suitability for marine calcium analysis or every trace-level application.
Separate blank preparation from reactor operation
HI70436M is water for method-directed laboratory use, including the referenced COD blank workflow. It is not marketed here as reactor heat-transfer fluid. A COD reagent blank still requires the correct reagent vial and complete procedure; water alone is not a photometer calibration standard.
Frequently Asked Questions
What exactly is included?
One 250 mL bottle of Hanna HI70436M deionized water. This is not a case, a 250-test reagent pack or a different bottle size.
Is this the same listing as HI740230 or the 1G HI70436?
No. HI740230 is a separate 230 mL product and HI70436 is also used for a separate 1G offer. Order the exact HI70436M SKU for the 250 mL bottle on this page.
Why is the HI97106 manual linked?
It explicitly lists HI70436M as deionized water in a 250 mL bottle and supplies the COD blank procedure. It is clearly a COD instrument method reference, not a standalone manual for the bottle.
How much water goes into a COD blank?
Use the volume specified by your exact method. For the referenced ISO COD MR HI93754G-25 procedure, the blank uses 2.0 mL deionized water in a separate reagent vial and follows the prescribed digestion sequence.
How many tests will one bottle provide?
No fixed test yield is promised. Blanks, validated dilutions, repeats, rinsing and contamination-control practices determine consumption. Bottle volume must not be relabeled as a test count.
Is this sterile, ultra-pure or calcium-free water?
Those specifications have not been verified for this exact offer. No numerical grade or resistivity is stated here. Check the water-quality requirement of your method and obtain confirmation before purity-critical work.
Can I use it as reactor heat-transfer fluid or a universal marine-analysis water?
Neither use is established here. This listing supports method-directed laboratory water use, especially the documented COD blank workflow, not reactor fluid or universal marine purity claims.
Does the linked US SDS cover this bottle?
The manufacturer SDS portal’s exact HI70436M lookup returns the HI70436 Deionized Water family sheet. The actual US document identifies water, CAS 7732-18-5. This family SDS is a safety reference, not proof of an analytical purity grade.
