International regulatory bodies now support the safer and quicker Dumas method, which uses oxidation by high-temperature combustion for sample preparation. Detection is by chemiluminescence or thermal conductivity. The Dumas method involves no chemicals and analysis can be completed in minutes. It can be fully automated and is suitable for continuous operation in high-throughput laboratories.
Purchasing considerations for nitrogen analyzers The fundamental considerations when choosing an analyzer will be the type of sample you are analyzing, whether you require multielement analysis, and whether the instrument complies with relevant regulatory guidelines. Other major factors are:
• Measuring range, detection limits, and accuracy • Speed of analysis • Automation • Sample volume • Software and reporting mechanisms.
Sample matrix Most nitrogen analyzers are designed to handle either solids or liquids, but some are more versatile. The TruMac N from LECO (
www.leco.com)
Figure 1 – The TruMac from LECO measures nitrogen/protein in organic samples such as soils, feeds, slurries, and wastewater. An autoloader pro- vides unattended analysis of up to 50 samples.
(Figure 1) measures nitrogen/protein in organic samples. It can handle heterogeneous, difficult-to-prepare, or low-level samples including soils, feeds, meats, pet foods, starches, slurries, and wastewater.
The Multi EA® 5000 from Analytik Jena (
www.analytik-jena.com) is a single modular analyzer that can handle liquid, paste-like, solid, gaseous, and liquefied petroleum gas (LPG) samples. The multimatrix autosampler injects into a double furnace that can be changed from horizontal to
screen optimization - optimized The perfect companion to mosquito® , TTP Labtech’s dragonfly® is a liquid handler for fast, simple screen optimization.
It offers positive displacement and non-contact dispensing from 0.5 μL upwards, for all types of liquids regardless of viscosity.
discover.ttplabtech/AmLab2014
fast prepares a 96-well gradient plate within 5 minutes
accurate
dispenses any volume into any well with no cross-contamination
simple user-friendly, fast set-up, easy screen design software
ttplabtech.com/dragonfly For more information please email:
sales@ttplabtech.com
AMERICAN LABORATORY • 15 • MAY 2014
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