Kjeldahl nitrogen
manual or automated digestion/distillation
Material Analysis · Composition & Elemental
Kjeldahl Nitrogen Determination
Characterise Kjeldahl nitrogen, crude protein after an agreed conversion factor, and method-defined organic plus ammonium nitrogen using a scope agreed around your sample and decision.
- Price
- from£60 per sample, excl. VAT
- Turnaround
- 6 working days Preparation and scope dependent
- Available platforms
- Buchi KjelMaster K-375Velp UDK 169FOSS：Kjeltec 8400
- Typical outputs
- Kjeldahl nitrogen resultOptional crude-protein resultBlank, standardisation, and replicate summaryProcessed chromatogram or spectrum
Why this service
What Kjeldahl can help you understand
Kjeldahl Nitrogen Determination is selected when the project needs defensible information on Kjeldahl nitrogen, crude protein after an agreed conversion factor, or method-defined organic plus ammonium…
Crude protein after an agreed conversion factor
nitrogen only
Method-defined organic plus ammonium nitrogen
nitrogen plus calculated protein
Choose the scope
Start from the question, not the tool
The method, preparation route and reporting depth depend on what you need to decide.
Manual or automated digestion/distillation
Kjeldahl nitrogen
- Best used when
- Kjeldahl nitrogen
- Typical result
- Kjeldahl nitrogen result
- Preparation note
- Exact mass and any drying or dispersion step are confirmed after technical review.
Nitrogen only
crude protein after an agreed conversion factor
- Best used when
- crude protein after an agreed conversion factor
- Typical result
- Optional crude-protein result
- Preparation note
- Declare volatility, corrosivity, suspended solids and any storage or temperature requirement.
Nitrogen plus calculated protein
method-defined organic plus ammonium nitrogen
- Best used when
- method-defined organic plus ammonium nitrogen
- Typical result
- Blank, standardisation, and replicate summary
- Preparation note
- Declare biological hazards and confirm fixation, dehydration, temperature and disposal requirements.
Common outputs
A result package matched to the decision you need to make
Fields, conditions, processing and file formats are confirmed before work begins.
Kjeldahl nitrogen result reported with the agreed units, sample reference and measurement conditions.
Optional crude-protein result supplied in a labelled format suitable for direct sample or condition comparison.
Blank, standardisation, and replicate summary provided with the processing basis and quality checks agreed during technical review.
Processed chromatogram or spectrum included when selected in the confirmed reporting scope.
Sample requirements
What to provide before work begins
Provide representative, clearly labelled samples and identify the decision, feature or comparison that matters.
| Suitable sample | Submission requirement | Planning note |
|---|---|---|
| Powder / particles | Provide a dry, homogeneous and clearly labelled sample in a sealed container. | Exact mass and any drying or dispersion step are confirmed after technical review. |
| Liquid / solution | Provide a sealed, compatible container labelled with composition, concentration and solvent. | Declare volatility, corrosivity, suspended solids and any storage or temperature requirement. |
| Biological / soft material | Provide fixed, preserved or otherwise stabilised material in the agreed container and medium. | Declare biological hazards and confirm fixation, dehydration, temperature and disposal requirements. |
| Solid / component | Provide a clean, stable and clearly labelled specimen with the target face or region identified. | Confirm dimensions, cutting permission and whether the original geometry must be preserved. |
Objective: state the decision, comparison or acceptance criterion the work must support.
Handling and access: declare hazards, instability, confidentiality, file constraints or special logistics before dispatch or transfer.
Questions and answers
Common planning decisions
Short answers to issues that can change preparation, scope, timing or interpretation.
What should I send for Kjeldahl Nitrogen Determination?
Provide powder / particles, liquid / solution, biological / soft material, solid / component as applicable. Exact quantity, dimensions and preparation are confirmed during technical review.
Which analysis option should I choose?
Choose the mode around the decision you need to make. For Kjeldahl nitrogen, start with manual or automated digestion/distillation; add nitrogen only when comparison or quantification is required.
How long will the test take?
Typical turnaround is 6 working days after sample acceptance and method confirmation.
What can limit the result?
Nitrate, nitrite, and some refractory compounds are not measured without modified digestion. Protein values depend on the chosen conversion factor.
Configure the service
Send the information needed to scope Kjeldahl correctly
- Sample form, material, dimensions and quantity
- Feature or decision the result must address
- Required comparison, acceptance criterion or reference
- Preferred output and reporting depth