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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Labconco™ Glass Manifold
Make exhaustion of fumes from Kjeldahl digestions more convenient by adding a Labconco Glass Manifold to your system.
Labconco™ Kjeldahl Micro Digestor
Individual electric heaters with adjustable controls
|Includes||Manifold, two rear brackets and six 100ml flasks|
|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|
|Height (English)||14 in.|
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.
|Flow Rate||32 LPM|
|For Use With (Application)||Neutralizing Poisonous Fumes and Reaction Gases|
|Pressure||Suction: 50 to 400 mbar|
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 Rapid Digestor-4
Digests all types of samples in about 25-45 minutes, depending on sample type and catalyst
DWK Life Sciences Wheaton™ Scrubber Absorber Tube
For arsenic analysis using silver diethyldithiocarbamate (SDDC) colorimetric method
Labconco™ Replacement Parts for Crude Fiber Apparatus
Graduated volumetric markings
|For Use With (Equipment)||Crude fiber apparatus|
Labconco™ Crude Fiber Apparatus
Six 350-watt heaters for 600mL beakers
Labconco™ Accessories for Labconco™ Kjeldahl Rapid Digester-25
Required for use with Labconco Rapid Digestors
|For Use With (Equipment)||Kjeldahl rapid digestor|
DWK Life Sciences Wheaton™ One-Piece Scrubber Absorber Tube
Modified version of catalog number 180020 for arsine analysis
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.
Labconco™ Kjeldahl Digestion Tubes for Rapid Digestor-4 and Rapid Digestor-25
For Rapid Digestor-25 and Rapid Digestor-4
|For Use With (Equipment)||Rapid digestor-25 and rapid digestor-4|
|Capacity (English)||8.45 oz.|
|Capacity (Metric)||250 mL|
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
|Height (Metric)||5.5 cm|
|Width (English)||1.37 in.|
|Capacity (English)||0.04 oz.|
|Capacity (Metric)||1.4 mL|
|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.|
Parr™ General Purpose Acid Digestion Bombs
Acid digestion bomb for organic and inorganic analytical samples
|Product Type||Acid Digestion Vessel|
|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|
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 Scientifica™ DK 42/26 Digestion Unit
Kjeldahl Digestion Units with 42-position aluminum heating block that offers an excellent thermal homogeneity for micro-kjeldahl applications.
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.
|No. of Places||20|
|Capacity (Metric)||20 x 250 mL|
|Material||Stainless Steel, Epoxy Painted with Chemical Resistant Coating|
|Temperature (Metric) Maximum||450°C|
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.
|Electrical Requirements||230 V, 50/60 Hz|
|Product Type||Tecator 2508 Digestor|
|Temperature (Metric) Maximum||440°C|
|For Use With (Application)||Fully automated digestion for Kjeldahl analysis|
|Holds||8 x 100/250mL Tubes|
Velp Scientifica™ DK18-26 Kjeldahl Digester System
This digestion unit with an 18-position aluminum heating block offers ideal thermal homogeneity for micro-kjeldahl applications.
Velp Scientifica™ DK6-48 Kjeldahl Digester System
This digestion unit with a 6-position aluminum heating block is for test tubes of 48 mm diameter, and offers ideal thermal homogeneity.
Velp Scientifica™ DK8 Kjeldahl Digester System
This digestion unit with an 8-position aluminum heating block offers ideal thermal homogeneity.
Velp Scientifica™ GDE Enzymatic Digester
Enzymatic digester for dietary fiber analysis by enzymes heating.