
Digestors
Systems and equipment designed to perform safe chemical digestions of a sample.
Typically performed on foodstuffs, the Kjeldahl method or test is designed to determine (or confirm) the amount of protein in soil, wastewater, fertilizer, and other materials. They are used in agricultural and environmental testing to measure trace metals, nitrates, and ammonium.
The method converts proteins, amines, organic compounds and other nitrogen compounds into ammonia compounds. A caustic is added to release the ammonia, which is then distilled and titrated. Samples are heated from 360o to 410°C in the presence of concentrated sulfuric acid and a catalyst. This decomposes or digests the sample and frees the nitrogen. The digestion is complete when the liquid is clarified and the fumes are released. The samples are cooled, and the liquid is distilled and titrated.
Several catalysts are available (called Kjeldahl tablets), and usually contain a mixture of copper and titanium. Some catalysts work better with specific materials, and others are more environmentally friendly. Digestions can be performed manually, but are somewhat hazardous and should always be performed under a chemical hood.
Automated or semi-automated digestors reduce the risk to the person performing the Kjeldahl testing. Some equipment is designed to heat to the maximum temperature in an hour and cool down faster for more efficient digestions. Some perform only the digestion portion of the procedure, and the distillation and titration must occur separately. More complete digestion systems incorporate all of the necessary steps and deliver a final result. The choice of digestor type, including rapid digestors , depends on the workload, speed required, and sample volume.
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Filtered Search Results

Velp Scientifica™ Automatic Kjeldahl Digestion Unit DKL Series
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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Automatic Kjeldahl Digestion Units with aluminum heating block that offers excellent thermal stability and homogeneity. The DKL Series is supplied with an auto lift, an auto suction cap, test tubes, sample rack and drip tray.
Height (Metric) | 690 mm |
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Product Type | Digestor |
Voltage | 230 V |
Temperature (English) Maximum | 842°F |
Material | Epoxy Painted Stainless Steel |
Temperature (Metric) Maximum | 450°C |
Hertz | 50/60 Hz |
Height (English) | 27.2 in. |
Display | Graphic LCD |
Parr™ General Purpose Acid Digestion Bombs

Acid digestion bomb for organic and inorganic analytical samples
Product Type | Acid Digestion Vessel |
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Quantity | 1 Ea. |
Material | Stainless Steel |
For Use With (Application) | Dissolves both organic and inorganic analytical samples, good for digesting alumina samples or reactants of unknown behavior, useful for complete containment of volatile chemicals, safety rupture disc in bomb head blows out to release pressure through opening in cover |
Labconco™ Kjeldahl Rapid Digestor-25
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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Extra-fast heating and cool-down time
BUCHI Scrubber K-415 TripleScrub
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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A three-step gas scrubbing instrument with a powerful pump and condensation, neutralization and adsorption steps. It protects the user and the environment not only by neutralizing poisonous fumes and reaction gases, but also by minimizing the use of cooling water.
Flow Rate | 32 LPM |
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Wattage | 140 W |
For Use With (Application) | Neutralizing Poisonous Fumes and Reaction Gases |
Pressure | Suction: 50 to 400 mbar |
Hertz | 50/60 Hz |
Display | None |
Labconco™ Kjeldahl Micro Digestor
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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Individual electric heaters with adjustable controls
Includes | Manifold, two rear brackets and six 100ml flasks |
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Height (Metric) | 36 cm |
Depth (English) | 9 in. |
Width (English) | 22.5 in. |
For Use With (Equipment) | Kjeldahl digestions |
Product Type | Micro Digestor |
Depth (Metric) | 23 cm |
Wattage | 200 W |
Quantity | 1 Ea. |
Hertz | 50/60 Hz |
Height (English) | 14 in. |
Display | No Display |
BUCHI SpeedDigester K-439
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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Combines all advantages of IR and block heating digestion systems to revolutionize Kjeldahl digestion. K-439 is the only programmable IR digestion system with an integrated temperature sensor, making fast IR digestion achievable at precise temperatures.
Velp™ Scientific DK6 Digester
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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Kjeldahl Digestion Unit with a six position aluminum heating block that offers high thermal homogeneity.
Velp Scientifica™ DKL12 Automatic Kjeldahl Digester System
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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This digestion unit with a 12-position aluminum heating block offers ideal thermal stability and homogeneity.
Velp Scientifica™ DKL8 Automatic Kjeldahl Digester System
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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This digestion unit with an 8-position aluminum heating block offers ideal thermal stability and homogeneity.
Velp Scientifica™ DK6 Kjeldahl Digester System
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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This digestion unit with an 6-position aluminum heating block offers ideal thermal homogeneity.
Velp Scientifica™ DK6-48 Kjeldahl Digester System
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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This digestion unit with a 6-position aluminum heating block is for test tubes of 48 mm diameter, and offers ideal thermal homogeneity.
Parr™ Microwave Acid Digestion Bomb

For high-speed heating: 20- to 30-minute cycle time, including cooling.
Quantity | 1 Ea. |
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Labconco™ Replacement Parts for Crude Fiber Apparatus
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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Graduated volumetric markings
For Use With (Equipment) | Crude fiber apparatus |
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Voltage | 115 V |
Quantity | 1 Ea. |
Material | Borosilicate Glass |
Hertz | 50/60 Hz |
Display | No Display |
DWK Life Sciences Kimble™ Kontes™ Dilatometer
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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Provides empirical measurement of solid fat content of shortenings, margarine oils, and other fats with solid index of 50 or less at 10°C
Height (Metric) | 5.5 cm |
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Width (English) | 1.37 in. |
Capacity (English) | 0.04 oz. |
Product Type | Dilatometer |
Capacity (Metric) | 1.4 mL |
Quantity | 1 Ea. |
For Use With (Application) | Used for determining the solid fat index of shortenings, margarine oils, and other fats with a solid index of 50 or less at 10°c |
Width (Metric) | 3.5 cm |
Height (English) | 2.16 in. |
DWK Life Sciences Wheaton™ Scrubber Absorber Tube
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
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Small and/or specialty supplier based on Federal laws and SBA requirements.
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For arsenic analysis using silver diethyldithiocarbamate (SDDC) colorimetric method