Sample comparison table
| Sample | Mode | NH₃ | N | NH₄⁺ | pH | Temperature | Reference | Status | Action |
|---|---|---|---|---|---|---|---|---|---|
| No samples added yet. | |||||||||
Formula used
How to use this calculator
Select a calculation mode and concentration basis. Enter measured values with matching units. Review every field before calculating.
Read the primary result and equivalent concentrations. Expand your review using formulas and calculation steps. Check warnings before applying any result.
Copy, print, or export completed calculations. Add useful results to the comparison table. Confirm laboratory procedures with qualified professionals before final decisions.
Example data
| Example | Inputs | Expected purpose |
|---|---|---|
| Aquarium sample | 1 mg/L TAN, pH 8.2, 25 °C | Estimate unionized NH₃ and NH₄⁺. |
| Stock dilution | 1000 mg/L to 10 mg/L, final volume 1 L | Find the required stock volume. |
| Mass concentration | 25 mg in 1 L | Calculate concentration and molarity. |
| Solution preparation | 100 mg/L target, 1 L, 10% product | Estimate product mass and volume. |
Understanding ammonia concentration
Ammonia measurements may report NH₃, NH₄⁺, or nitrogen equivalents. These labels are not interchangeable without molecular-weight conversion. Always record the reported analytical basis.
Unionized NH₃ usually increases as pH rises. Temperature also changes the ammonia equilibrium. Salinity can slightly change the estimated fraction.
Total ammonia nitrogen includes both ionized and unionized forms. Toxicity interpretation depends on species and exposure conditions. Use local standards for compliance decisions.
Frequently asked questions
What is total ammonia nitrogen?
Total ammonia nitrogen measures ammonia nitrogen across NH₃ and NH₄⁺. Laboratories often report TAN in mg/L as N. Check the report basis before converting.
What is unionized ammonia?
Unionized ammonia is the molecular NH₃ form. Its fraction rises with pH and temperature. This form often receives special toxicity attention.
Are ppm and mg/L identical?
They are approximately equal in dilute water solutions. Density differences can make them diverge. Use density-aware methods for concentrated solutions.
Why does concentration basis matter?
NH₃, NH₄⁺, and nitrogen have different molecular masses. Equal numbers can represent different chemical amounts. Select the exact basis shown by your source.
How is molarity calculated?
Convert the selected basis into equivalent NH₃ grams per liter. Divide that value by molecular weight. The result is moles per liter.
Can this calculator prepare concentrated ammonia?
The preparation mode provides planning estimates. Concentrated ammonia requires appropriate engineering controls. Follow product safety documents and laboratory procedures.
Why is density sometimes required?
Weight and volume percentages describe different quantities. Density connects solution mass with solution volume. Enter reliable density data for those conversions.
How does salinity affect the result?
Salinity changes ionic strength and ammonia equilibrium. The calculator applies an estimated correction for saltwater. Confirm specialized work with validated methods.
Can I compare several samples?
Calculate each sample and add it below. The table stores key converted values. Remove individual rows whenever needed.
What reference limit should I enter?
Enter the limit required by your application. Limits vary across species and jurisdictions. Do not treat the default as regulatory advice.
Why can dilution fail validation?
Simple dilution cannot increase concentration using solvent alone. The final concentration should not exceed stock concentration. Review units and entered values carefully.