HANNA Carbon Dioxide (CO2) Test Kit

Yes. The HI3818 is rated for both freshwater and saltwater samples, and needs no separate marine reagent or conditioner.

0.1 mg/L on the 0.0-10.0 mg/L range, 0.5 mg/L on the 0.0-50.0 mg/L range and 1 mg/L on the 0-100 mg/L range.

A phenolphthalein-indicated titration – carbonic acid in the sample is neutralised with dilute sodium hydroxide to pH 8.3.

No. The kit is entirely manual and needs no instrument, no calibration and no power.

Reagent refill packs are not listed separately on this page – contact Fresh By Design to check current availability.

A titration test kit for checking carbon dioxide in fresh or salt water without a meter.

$60.00 ex GST

SKU: HI3818

Categories: Test Kits, Water Quality Monitoring

Applications: Aquaponics, Hatchery, Live Holding & Purging, LSS, Pond, RAS

Brand: HANNA

Product Information

Measures dissolved carbon dioxide by phenolphthalein titration — carbonic acid in the sample is neutralised with dilute sodium hydroxide to pH 8.3
Three working ranges: 0.0–10.0 mg/L reading to 0.1 mg/L, 0.0–50.0 mg/L reading to 0.5 mg/L, and 0–100 mg/L reading to 1 mg/L
Valid in both fresh water and seawater — no separate marine version and no conditioning reagent required
Approximately 110 tests per kit
Supplied complete: 10 mL phenolphthalein indicator, 120 mL carbon dioxide reagent, 10 mL and 50 mL calibrated vessels and a calibrated syringe
No meter, calibration or power required — reads tank-side or in the field
Only the carbon dioxide reagent needs careful handling; the rest of the kit is designed to minimise spills
Choosing your range: use 0.0–10.0 mg/L when you need 0.1 mg/L resolution around a target, 0.0–50.0 mg/L for routine RAS and pond monitoring, and 0–100 mg/L for troubleshooting high-CO₂ events — one HI3818 kit covers all three

Specification	Detail
Product code	HI3818
Parameter measured	Dissolved carbon dioxide (CO₂)
Method	Phenolphthalein titration — CO₂ as carbonic acid neutralised with dilute sodium hydroxide to pH 8.3
Range 1	0.0–10.0 mg/L — smallest increment 0.1 mg/L
Range 2	0.0–50.0 mg/L — smallest increment 0.5 mg/L
Range 3	0–100 mg/L — smallest increment 1 mg/L
Tests per kit	Approximately 110
Water types	Fresh water and seawater
Instrument required	None — manual titration, no power or calibration
Kit contents	10 mL phenolphthalein indicator, 120 mL carbon dioxide reagent, 10 mL calibrated vessel, 50 mL calibrated vessel, calibrated syringe
Reagent shelf life	Not published by supplier
Refill packs	Not published by supplier

Does this kit work in seawater?

What resolution does it read to?

How many tests do I get from one kit?

What chemistry does it use?

Do I need a meter or a power supply?

Is it safe to handle?

Can I buy replacement reagents?

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