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Kjeldahl Digestion Catalysts | VWR® Ready-to-Use Tablets
VWR® Kjeldahl Tablets are precision-formulated catalysts used to facilitate the digestion phase in the Kjeldahl method for nitrogen and protein analysis. Designed for use with sulfuric acid, these tablets accelerate the oxidative breakdown of nitrogenous organic compounds, forming the basis for Total Kjeldahl Nitrogen (TKN) determination across food, agriculture, wastewater, and environmental samples.
The tablet format ensures consistent composition, safe handling, and ease of use. A comprehensive range of formulations is available to suit different matrices and digestion conditions, including mercury- and selenium-free options for environmentally safer workflows.
Product Attributes
- Optimized for Kjeldahl nitrogen and protein determination
- Broad range of formulations with defined catalyst compositions
- Available in mercury- and selenium-free formats
- Pre-measured tablet form ensures ease of use and dosage consistency
- Suitable for food testing, water quality analysis, and environmental labs
Applications
- Protein and nitrogen content analysis in food and feed
- Wastewater and sludge TKN determination
- Soil and fertilizer nitrogen monitoring
- Environmental and agricultural research
- General laboratory nitrogen digestion procedures
Available Formulations (100 Tablets per Pack)
| Catalog Number | Tablet Name / Type | Mass (g) | Composition Summary |
|---|---|---|---|
| 85539.0100 | Catalyst, Hg/Se-Free | 3.5 | K₂SO₄ 23.1%, Na₂SO₄ 69.3%, CuSO₄ 1.8%, TiO₂ 2.8% |
| 85540.0100 | Catalyst, Hg/Se-Free | 5.0 | K₂SO₄ 23.1%, Na₂SO₄ 69.3%, CuSO₄ 1.8%, TiO₂ 2.8% |
| 85541.0100 | Missouri | 5.0 | K₂SO₄ 48.4%, Na₂SO₄ 48.3%, CuSO₄ 0.3% |
| 85542.0100 | Wieninger | 3.5 | Na₂SO₄ 96.25%, CuSO₄ 1.5%, Se 1.5% |
| 85543.0100 | Wieninger | 5.0 | Na₂SO₄ 96.25%, CuSO₄ 1.5%, Se 1.5% |
| 85544.0100 | PS | 5.0 | K₂SO₄ only |
| 85525.0100 | CX | 5.5 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.5 g |
| 85526.0100 | CT | 5.3 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.15 g, TiO₂ 0.15 g |
| 85527.0100 | C | 5.1 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.1 g |
| 85528.0100 | TCT | 3.71 | K₂SO₄ 3.5 g, CuSO₄·5H₂O 0.105 g, TiO₂ 0.105 g |
| 85529.0100 | CK | 3.9 | K₂SO₄ 3.5 g, CuSO₄·5H₂O 0.4 g |
| 85530.0100 | ST | 3.5 | K₂SO₄ 3.5 g, Se 0.0035 g |
| 85531.0100 | CTQ | 1.59 | K₂SO₄ 1.5 g, CuSO₄·5H₂O 0.045 g, TiO₂ 0.045 g |
| 85532.0100 | Antifoam | 1.0 | Na₂SO₄ 0.97 g, Silicon antifoam 0.03 g |
| 85533.0100 | NAS | 1.05 | Na₂SO₄ 1.0 g, Se 0.05 g |
| 85534.0100 | S | 5.005 | K₂SO₄ 5.0 g, Se 0.005 g |
| 85535.0100 | KS | 5.0 | K₂SO₄ 4.9505 g, Se 0.0495 g |
| 85536.0100 | W K150 | 5.0 | K₂SO₄ 4.875 g, CuSO₄·5H₂O 0.075 g, Se 0.05 g |
| 85537.0100 | IB61 | 5.0 | K₂SO₄ 4.673 g, CuSO₄·5H₂O 0.281 g, Se 0.046 g |
| 85538.0100 | AB04 | 5.025 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.025 g |
Ordering and Safety
All formulations are supplied with Certificates of Analysis (CoA) and Safety Data Sheets (SDS). Select catalyst type based on sample matrix, digestion requirements, and laboratory safety standards.
Brochure: Kjeldahl tablets
Kjeldahl Digestion Catalysts | VWR® Ready-to-Use Tablets
VWR® Kjeldahl Tablets are precision-formulated catalysts used to facilitate the digestion phase in the Kjeldahl method for nitrogen and protein analysis. Designed for use with sulfuric acid, these tablets accelerate the oxidative breakdown of nitrogenous organic compounds, forming the basis for Total Kjeldahl Nitrogen (TKN) determination across food, agriculture, wastewater, and environmental samples.
The tablet format ensures consistent composition, safe handling, and ease of use. A comprehensive range of formulations is available to suit different matrices and digestion conditions, including mercury- and selenium-free options for environmentally safer workflows.
Product Attributes
- Optimized for Kjeldahl nitrogen and protein determination
- Broad range of formulations with defined catalyst compositions
- Available in mercury- and selenium-free formats
- Pre-measured tablet form ensures ease of use and dosage consistency
- Suitable for food testing, water quality analysis, and environmental labs
Applications
- Protein and nitrogen content analysis in food and feed
- Wastewater and sludge TKN determination
- Soil and fertilizer nitrogen monitoring
- Environmental and agricultural research
- General laboratory nitrogen digestion procedures
Available Formulations (100 Tablets per Pack)
| Catalog Number | Tablet Name / Type | Mass (g) | Composition Summary |
|---|---|---|---|
| 85539.0100 | Catalyst, Hg/Se-Free | 3.5 | K₂SO₄ 23.1%, Na₂SO₄ 69.3%, CuSO₄ 1.8%, TiO₂ 2.8% |
| 85540.0100 | Catalyst, Hg/Se-Free | 5.0 | K₂SO₄ 23.1%, Na₂SO₄ 69.3%, CuSO₄ 1.8%, TiO₂ 2.8% |
| 85541.0100 | Missouri | 5.0 | K₂SO₄ 48.4%, Na₂SO₄ 48.3%, CuSO₄ 0.3% |
| 85542.0100 | Wieninger | 3.5 | Na₂SO₄ 96.25%, CuSO₄ 1.5%, Se 1.5% |
| 85543.0100 | Wieninger | 5.0 | Na₂SO₄ 96.25%, CuSO₄ 1.5%, Se 1.5% |
| 85544.0100 | PS | 5.0 | K₂SO₄ only |
| 85525.0100 | CX | 5.5 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.5 g |
| 85526.0100 | CT | 5.3 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.15 g, TiO₂ 0.15 g |
| 85527.0100 | C | 5.1 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.1 g |
| 85528.0100 | TCT | 3.71 | K₂SO₄ 3.5 g, CuSO₄·5H₂O 0.105 g, TiO₂ 0.105 g |
| 85529.0100 | CK | 3.9 | K₂SO₄ 3.5 g, CuSO₄·5H₂O 0.4 g |
| 85530.0100 | ST | 3.5 | K₂SO₄ 3.5 g, Se 0.0035 g |
| 85531.0100 | CTQ | 1.59 | K₂SO₄ 1.5 g, CuSO₄·5H₂O 0.045 g, TiO₂ 0.045 g |
| 85532.0100 | Antifoam | 1.0 | Na₂SO₄ 0.97 g, Silicon antifoam 0.03 g |
| 85533.0100 | NAS | 1.05 | Na₂SO₄ 1.0 g, Se 0.05 g |
| 85534.0100 | S | 5.005 | K₂SO₄ 5.0 g, Se 0.005 g |
| 85535.0100 | KS | 5.0 | K₂SO₄ 4.9505 g, Se 0.0495 g |
| 85536.0100 | W K150 | 5.0 | K₂SO₄ 4.875 g, CuSO₄·5H₂O 0.075 g, Se 0.05 g |
| 85537.0100 | IB61 | 5.0 | K₂SO₄ 4.673 g, CuSO₄·5H₂O 0.281 g, Se 0.046 g |
| 85538.0100 | AB04 | 5.025 | K₂SO₄ 5.0 g, CuSO₄·5H₂O 0.025 g |
Ordering and Safety
All formulations are supplied with Certificates of Analysis (CoA) and Safety Data Sheets (SDS). Select catalyst type based on sample matrix, digestion requirements, and laboratory safety standards.
Brochure: Kjeldahl tablets
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Specifications
| Catalyst Composition | Kjeldahl Catalyst free of mercury and selenium, 3.5 g; Contains K₂SO₄, 23.10%; Na₂SO₄, 69.30%; CuSO₄, 1.80%; TiO₂, 2.80%, Kjeldahl Catalyst free of mercury and selenium, 5.0 g; Contains K₂SO₄, 23.10%; Na₂SO₄, 69.30%; CuSO₄, 1.80%; TiO₂, 2.80%, Kjeldahl Catalyst Missouri, 5.0 g; Contains K₂SO₄, 48.40%; Na₂SO₄, 48.30%; CuSO₄, 0.30%, Kjeldahl Catalyst Wieninger, 3.5 g; Contains Na₂SO₄, 96.25%; CuSO₄, 1.50%; Se, 1.50%, Kjeldahl Catalyst Wieninger, 5.0 g; Contains Na₂SO₄, 96.25%; CuSO₄, 1.50%; Se, 1.50%, Kjeldahl Catalyst PS, 5.0 g; Contains K₂SO₄, Kjeldahl Catalyst CX, 5.5 g; Contains K₂SO₄, 5 g; CuSO₄-5H₂O, 0.5 g, Kjeldahl Catalyst CT, 5.3 g; Contains K₂SO₄, 5 g; CuSO₄-5H₂O, 0.15 g; TiO₂, 0.15 g, Kjeldahl Catalyst C, 5.1 g; Contains K₂SO₄, 5 g; CuSO₄-5H₂O, 01 g, Kjeldahl Catalyst TCT, 3.71 g; Contains K₂SO₄, 3.5 g; CuSO₄-5H₂O, 0.105 g; TiO₂, 0.105 g, Kjeldahl Catalyst CK, 3.9 g; Contains K₂SO₄, 3.5 g; CuSO₄-5H₂O, 0.4 g, Kjeldahl Catalyst ST, 3.5 g; Contains K₂SO₄, 3.5 g; Se, 0.0035 g, Kjeldahl Catalyst CTQ, 1.59 g; Contains K₂SO₄, 1.5 g; CuSO₄-5H₂O, 0.045 g; TiO₂, 0.045 g, Kjeldahl Catalyst Antifoam, 1.0 g; Contains Na₂SO₄, 0.97 g; silicon-antifoam, 0.03 g, Kjeldahl Catalyst NAS, 1.05 g; Contains Na₂SO₄, 1 g; Se, 0.05 g, Kjeldahl Catalyst S, 5.005 g; Contains K₂SO₄, 5 g; Se, 0.005 g, Kjeldahl Catalyst KS, 5.05 g; Contains K₂SO₄, 4.9505 g; Se, 0.0495 g, Kjeldahl Catalyst W K150, 5.0 g; Contains K₂SO₄, 4.875 g; CuSO₄-5H₂O, 0.075 g; Se, 0.050 g, Kjeldahl Catalyst IB61, 5.0 g; Contains K₂SO₄, 4,673 g; CuSO₄-5H₂O, 0.281 g; Se, 0.046 g, Kjeldahl Catalyst AB04, 5.025 g; Contains K₂SO₄, 5 g; CuSO₄-5H₂O, 0.025 g |