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.
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.
DWK Life Sciences Wheaton™ One-Piece Scrubber Absorber Tube
Modified version of catalog number 180020 for arsine analysis
DWK Life Sciences Wheaton™ Scrubber Absorber Tube
For arsenic analysis using silver diethyldithiocarbamate (SDDC) colorimetric method
Velp Scientifica™ Automatic Kjeldahl Digestion Unit DKL Series
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.
BUCHI K-439 Model SpeedDigestor
The SpeedDigester K-439 revolutionizes IR digestion by combining the benefits of IR and block digestion in one unit, with fast nitrogen determination by Kjeldahl digestion at controlled temperatures enabling an increased sample throughput.
behr Labor-Technik™ behrotest™ Digestion Apparatus
The digestion units of the model series behrotest™ InKjel are equipped with a high-performance infrared heater. Quality and position of the behr infrared heater guarantee the user identical heating phases and digestion temperatures at all sample positions.
Velp Scientifica™ DK 20 Digester
Kjeldahl Digestion Units with a 20-position aluminum heating block that offers an excellent thermal homogeneity.
Velp Scientifica™ DK 18/26 Digestion Unit
Kjeldahl Digestion Unit with an 18-position aluminum heating block that offers an excellent thermal homogeneity for micro-kjeldahl applications.
behr Labor-Technik™ COD Digestor System
Capable of simultaneous EPA, ISO, or DIN method digestion of up to 8/12 COD samples. behr Labor-Technik™ COD Digestor System is a workstation comprising all necessary components for COD sample digestion.
behr Labor-Technik™ InKjel™ 1225M Rapid Digestion System
The digestion units of the model series behrotest™ InKjel are equipped with a high-performance infrared heater. Quality and position of the behr infrared heater guarantee the user identical heating phases and digestion temperatures at all sample positions.
behr Labor-Technik™ K 20 Model Standard Kjeldahl Block Digestion System
Complete system with digestion vessel, frame and extraction hood. With 8, 12 or 20 sample positions for standard Kjeldahl digestion vessels with a volume of 250 mL. The block casing as well as the rack for the digestion devices and the hood are made of acid-resistant, non-corrosive stainless steel.
WTW™ Variable Wave-length Thermoreactor with 4 Temperature Settings
For the disintegration of COD, total nitrogen and total phosphorus
Velp Scientifica™ GDE Enzymatic Digester
Enzymatic digestion for dietary fiber analysis by enzymes heating. It offers non-stop sample mixing for homogeneity.
K-425 Model SpeedDigestor
Set new standards in terms of digestion speed, flexible use and result reproducibility with the IR SpeedDigester. BUCHI K-425 Model SpeedDigestors provide increased sample throughput for nitrogen determination by Kjeldahl digestion and multiply instrument functionality when needs change.
