Model : Büchi Speed Digester K-425 / K-436
Acid digestion for converting organic nitrogen to ammonium.
The Büchi Speed Digester K-425 / K-436 is a high-performance acid digestion system for rapid, reproducible conversion of organic nitrogen to ammonium in solid and liquid samples. It is the essential first step in total Kjeldahl nitrogen (TKN) determination.
- Rapid Acid Digestion
- Programmable Temperature Control
- Efficient Exhaust Scrubbing
Overview
Our center is equipped with a Büchi Speed Digester K-425 / K-436, a reliable and efficient digestion unit designed to process multiple samples simultaneously under controlled temperature programs. The system breaks down organic matter with concentrated sulfuric acid in the presence of a catalyst, converting organically bound nitrogen into ammonium sulfate.
Paired with a distillation and titration unit, this digester enables accurate TKN analysis in sludge, compost, soil, wastewater, and waste-derived materials, supporting nutrient profiling, regulatory compliance, and circular economy nutrient recovery.
What It Provide
The digestion system itself does not perform analytical measurement; it chemically converts organic nitrogen species into a single measurable form (ammonium) for subsequent quantification. Its controlled process ensures complete conversion without nitrogen loss.
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Organic Nitrogen Digestion Converts organic nitrogen compounds to ammonium via acid decomposition and catalysis.
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Sample Throughput Processes up to 20 samples simultaneously, depending on block configuration.
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Reproducible Conditions Programmable temperature ramps and timer ensure consistent batch-to-batch digestion.
Key Applications
The Kjeldahl digestion system provides the critical sample preparation step for TKN analysis across environmental and waste matrices.
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Sludge and Biosolids Analysis Digests sludge samples for organic nitrogen quantification.
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Compost and Organic Waste Breaks down organic matter to determine nutrient nitrogen content.
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Soil Fertility Assessment Converts soil organic nitrogen to ammonium for TKN analysis.
All devices are operated within standardized laboratory workflows to ensure accuracy, traceability, and compliance with analytical standards.
- Accuracy
- Traceability
- Compliance