- -7.9%
- -7.9%
- en réappro
Calculation of toxic ammonia (NH3)
To determine the amount of ammonia NH3, multiply the value of total free ammonia (NH3/NH4+) displayed by the photometer by the percentage of ammonia indicated in the table below.
Example: pH 8.0, temperature: 24°C, NH3 / NH4+ 1.00 mg/L (ppm)
Concentration of toxic ammonia: 1.00 mg/L (ppm) x (5.0 ÷ 100)= 0.05 mg/L (ppm)
Percentage of ammonia (NH3)
| pH | 21°C | 24°C | 26°C | 29°C |
| 7.6 | 1.7 | 2.1 | 2.4 | 2.9 |
| 7.8 | 2.6 | 3.2 | 3.7 | 4.5 |
| 8.0 | 4.1 | 5.0 | 5.8 | 7.0 |
| 8.2 | 6.3 | 7.7 | 8.8 | 11 |
| 8.4 | 9.7 | 12 | 13 | 16 |
| 8.6 | 15 | 17 | 20 | 23 |
| 8.8 | 21 | 25 | 28 | 32 |
Technical characteristics :
HI784 comes with 2 measuring cuvettes and their caps, reagents for 10 ammonia tests, 1 plastic filling pipette and the battery.
Technical data
| Specifications | HI783 |
| Range |
0.10 to 2.50 mg/L (ppm) in NH3 |
| Resolution | 0.01mg/L (ppm) |
| Accuracy (at 25°C) |
±0.05 mg/L (ppm) ±5% of reading |
| Method | Adaptation of the salicylate method. The reaction between ammonia and ammonium and the reagent causes a blue-green coloration of the sample |
| Light source | 610nm LEDs |
| Light detector | Silicon photocell |
| Environment | The prepared sample cuvette (sample plus reagents) must be between 18 and 28°C* |
| Dimensions / Weight | 86 x 61 x 37.5mm / 64g |
Product Details
HI784
Reviews about this product
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Stefano R.
Published Oct 10, 2026 at 03:23 am (Order date: Oct 01, 2026)Top (Translated review)
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Reynaud R.
Published Dec 01, 2025 at 02:14 pm (Order date: Nov 26, 2025)Products corresponding to what I asked for, but unfortunately it is a pity that the three sensitive box, I had trouble starting the 15 minutes, Sheep, too sensitive, you barely leave your finger on it, it turns off but I think you need to get the hang of it (Translated review)
Hanna Instruments - Mini Ammonia Marine Photometer - HI784