Infrared speeddigester for nitrogen determination and chemical oxygen demand
Effortlessly enhance your laboratory throughput with high-speed digestion for precise nitrogen and chemical oxygen demand analysis in diverse samples, ensuring streamlined fume management and superior sample integrity.

The SpeedDigester K-425, K-436, and K-439 from BUCHI provide a versatile solution for efficient laboratory digestion. These infrared and reflux digesters excel in performing rapid and flexible Kjeldahl and COD digestion processes, along with various sample types like food, soil, and industrial wastewater. With a temperature range of 50–580°C, the digesters support multiple sample sizes and applications, enhancing productivity in food, environmental, and chemical analysis. The K-439’s automation capabilities, complete with programmable temperature settings and scrubber control for safe fume handling, optimize laboratory workflows. Designed for seamless integration, these units ensure high throughput and result reproducibility while offering optional customization and engineering support for diverse laboratory needs.
Benefits
- Maximizes sample throughput and reduces process time via rapid heating and cooling.
- Enhances laboratory safety with sealed fume extraction and neutralization.
- Provides flexibility for varied sample sizes and applications, adapting to specific testing needs.
- Saves laboratory space with compact, bench-top design.
- Supports operational efficiency by allowing parallel tasks during automated digestion cycles.
- Applications
- Chemicals,Food,Water testing,Environmental analysis,Industrial effluents,Soil samples,Feed industry,Nutrients,Pharmaceuticals
- End products
- Animal feed,Industrial wastewater,Water quality testing kits,Pharmaceutical tablets,Pasta,Fertilizer components,Soil amendments,Protein isolates,Processed meat products
- Steps before
- Sample Preparation,Milling,Homogenization
- Steps after
- Distillation,Analysis,Neutralization,Measurement
- Input ingredients
- nitrogen samples,aqueous samples,Kjeldahl digestion samples,samples for hydroxyproline,samples for phosphate determination,samples for COD (Chemical Oxygen Demand),samples containing heavy metals
- Output ingredients
- digested samples,total Kjeldahl nitrogen,determined COD,detected heavy metals,determined phosphate levels,hydroxyproline measurement
- Maximum Temperature
- 580°C
- Sample Positions
- 5 - 12
- Sample Parameters
- Total Kjeldahl Nitrogen (TKN),Chemical Oxygen Demand (COD),heavy metals,phosphate
- Scrubber Control
- No/Yes
- Temperature Range
- 50 – 580°C
- Compatibility with BUCHI Sample Tubes
- 100 mL,300 mL,500 mL
- Heating Chamber Operation
- Manual temperature setting,infinitely variable from level 1 to 10
- Automation
- No/Yes
- Display
- No/Yes
- Temperature Programs
- No/Yes
- Possibility to have an IQ/OQ
- No/Yes
- Cooling Method
- Quick cool-down process
- Fume Capture System
- Sealed Suction
- Glass Assembly
- Multiple options for different digestion processes
- Condensate Trap
- Available for aqueous samples
- Chemical Used
- H₂O₂
- Automation level
- Manual / PLC
- Batch vs. continuous operation
- Batch
- Cleaning method
- Manual / CIP
- Energy efficiency
- Efficient due to fast heating/cooling
- Density/particle size
- 0.5–2.5 g/cm³
- Sample Positions
- 5 - 12
- Max. Temperature
- 580°C
- Sample tube sizes
- 100 mL,300 mL,500 mL
- Suction module type
- Standard,with condensate trap,with capillary funnels
- Heating chamber operation
- Individual manual temperature setting
- Temperature control
- Infinitely variable from level 1 to 10
- Kjeldahl and reflux digestion
- Combined in one instrument
- Market info
- Buchi is renowned for its expertise in laboratory and industrial solutions, particularly in producing high-quality equipment for chemical analysis and lab processes, known for precision and reliability in the pharmaceutical, chemical, and food industries.