Hanna Instruments HI-3896-025 Soil analysis, Ned (Nitrogen), ascorbic acid (Phosphorus), tetraphenylborate (Potassium)
Product details
The HI-3896-025 are replacement reagents for the determination of nitrogen, phosphorus, pH, and potassium with the HI-3896 Hanna Soil Test Kit.
There are enough reagents for approximately 25 tests for each parameter to be used with Hanna’s test kit. These high quality reagents are clearly marked with the lot number and expiry date on each packet for traceability.
Soil analysis reagent set for the HI-3896.
The HI-3896-025 are high quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements of nitrogen, phosphorus, pH, and potassium with the soil test kit. This replacement set includes enough reagents for approximately 25 tests for each of the four measured parameters.
The nitrogen, phosphorus, and pH tests are colorimetric tests. During the tests, a colour is developed which corresponds with the fertility of the soil. To determine the fertility, the colour developed has to be compared with one of the supplied colour cards.
The reagents for nitrogen follow the Ned method to determine concentration as nitrate-nitrogen (NO3--N). These reagents are designed to be used with samples to generally indicate the nitrogen amount in trace, low, medium, and high quantities.
The reagents for phosphorus follow the ascorbic acid method to determine concentration as phosphorus pentoxide (P2O5). These reagents are designed to be used with samples to generally indicate the phosphorus amount in trace, low, medium, and high quantities.
The reagents for pH follow the colorimetric indicator method to determine soil pH. These reagents are designed to be used with samples that have an expected pH range of 4 to 9 pH.
The potassium (K2O) test is a turbidimetric test. If potassium is present in a soil sample, turbidity is formed. A blue colour will also develop to help in reading the test result. To determine the amount of potassium present, the colour developed has to be compared with the supplied colour card.
The reagents for potassium follow the tetraphenylborate method to determine concentration as potassium oxide (K2O). These reagents are designed to be used with samples to generally indicate the potassium amount in trace, low, medium, and high quantities.
Specifications
| Nitrogen | Method | colorimetric |
| Range | traces, low, medium, high | |
| Chemical Method | Ned | |
| No. of Tests | 25 | |
| Phosphorus | Method | colorimetric |
| Range | traces, low, medium, high | |
| Chemical Method | ascorbic acid | |
| No. of Tests | 25 | |
| pH | Method | colorimetric |
| Range | 4 to 9 pH (1 pH increments) | |
| Chemical Method | pH indicator | |
| No. of Tests | 25 | |
| Potassium | Method | turbidimetric |
| Range | traces, low, medium, high | |
| Chemical Method | tetraphenyl-borate | |
| No. of Tests | 25 | |
| Dimensions | 235 x 176 x 117 mm | |
| Weight | 710 g |
Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.