Digestors
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.
Labconco™ Accessories for Labconco™ Kjeldahl Rapid Digester-25
Required for use with Labconco Rapid Digestors
PYREX™ Folin-Wu Digestion Tube
Fabricated from selected tubing for product durability
Labconco™ Kjeldahl Rapid Digestor-25
Extra-fast heating and cool-down time
Labconco™ Kjeldahl Digestion Unit
Two-place Benchtop Kjeldahl Digestion Apparatus
Labconco™ Kjeldahl Rapid Digestor-25 Fume Removal System
For Rapid Digestor-25
DWK Life Sciences Wheaton™ Scrubber Absorber Tube
For arsenic analysis using silver diethyldithiocarbamate (SDDC) colorimetric method
Promotions are available
Labconco™ Crude Fiber Apparatus
Six 350-watt heaters for 600mL beakers
BUCHI KjelDigester K-449
KjelDigester K-449 offers fast and safe digestion of up to 20 samples simultaneously. This fully automated model offers a convenient automatic lift for raising and lowering the sample tube rack, and a programming mode so that all digestion methods can be saved.
DWK Life Sciences Kimble™ Kontes™ Dilatometer
Provides empirical measurement of solid fat content of shortenings, margarine oils, and other fats with solid index of 50 or less at 10°C
Promotions are available
MilliporeSigma™ Spectroquant™ TR 420 Thermoreactor
Digest up to 24 samples simultaneously
BUCHI SpeedDigester K-439
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.
BUCHI Scrubber K-415 TripleScrub
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.
Labconco™ Kjeldahl Digestion Tubes for Rapid Digestor-4 and Rapid Digestor-25
For Rapid Digestor-25 and Rapid Digestor-4
Labconco™ Kjeldahl Rapid Digestor-4
Digests all types of samples in about 25-45 minutes, depending on sample type and catalyst
Labconco™ Kjeldahl Micro Digestor
Individual electric heaters with adjustable controls
Labconco™ Replacement Parts for Crude Fiber Apparatus
Graduated volumetric markings
Velp™ Scientific DK6 Digester
Kjeldahl Digestion Unit with a six position aluminum heating block that offers high thermal homogeneity.
Velp Scientifica™ DK 20 Digester
Kjeldahl Digestion Units with a 20-position aluminum heating block that offers an excellent thermal homogeneity.
Velp™ Scientific DK8 Digester
Kjeldahl Digestion Unit with an eight position aluminum heating block that offers high thermal homogeneity.
Foss™ Digestion System: Scrubber Units: SR210
For neutralization of corrosive fumes in acid digestions
Foss™ Tecator™ 2508 Digestion System
Based on a digestion unit and a tube rack, allowing fully automated digestion for convenient, safe and flexible Kjeldahl analysis. Foss North America Tecator 2508 Digestion System is capable of handling eight 250mL or 100mL tubes. To use 100mL tubes, appropriate adaptors must be purchased.
Velp Scientifica™ SMS Scrubber
Designed to neutralize corrosive and toxic fumes produced during oxidative mineralizations or similar processes. Velp Scientifica™ SMS Scrubber is a space-saving and convenient solution for reducing airspace toxicity.
Velp™ Scientific DK6/48 Digester
Kjeldahl Digestion Unit with a six position aluminum heating block that offers high thermal homogeneity.
Velp™ Scientific DK18/26 Digester
Kjeldahl Digestion Unit with an eighteen position aluminum heating block that offers high thermal homogeneity for micro-kjeldahl applications.
Parr™ Microwave Acid Digestion Bomb
For high-speed heating: 20- to 30-minute cycle time, including cooling.
Parr™ Cell Disruption Vessels
Provides a gentle method for homgenizing or fractionating cells
Velp Scientifica™ DK 42/26 Digester
Kjeldahl Digestion Units with a 42-position aluminum heating block that offers an excellent thermal homogeneity for micro-kjeldahl applications.
Velp Scientifica™ Automatic Kjeldahl Digestion Unit DKL Series
Offers excellent temperature homogeneity, precision and accuracy. VELP Scientifica™ Automatic Kjeldahl Digestion Unit, DKL Series is supplied with an auto lift and an auto suction cap and is a complete package including test tubes, sample rack and drip tray.
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