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How Automating Nitrogen Determination Works

The need to perform nitrogen determination in a series of different commodity products requires a universal method that is simple, safe, quick, precise, and uses the least possible sample quantity

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VELP ELEMENTAL ANALYZERS work with helium and argon as carrier gas and are enabled to connection to the cloud-based platform VELP Ermes.

Q: Is there a universal, fast, and safe method for nitrogen determination using the smallest sample size while ensuring maximum precision and repeatability?

The need to perform nitrogen determination in a series of different commodity products, such as drugs, organic compounds, perfumes, extracts from various sources, detergents, research products (for example, seeds under development, the quantity of which is very limited), precious materials, etc. requires a universal method that is simple, safe, quick, precise, and uses the least possible sample quantity, especially when this is precious or scarce. The most used and most traditional method in this field is surely Kjeldahl, but for these types of samples, Kjeldahl presents a series of drawbacks that make its use complicated or not suitable.

A: The VELP combustion analyzers offer the operator a cloudenabled solution to precisely determine the nitrogen content of small sample quantities easily and in a few minutes.

A common situation for many lab operators is to have limited sample quantities, and a series of analyses have to be performed to obtain accurate results. Another possible and frequent situation— the sample to be analyzed is precious, so it is important to minimize the sample consumption and associated costs.

VELP’s elemental analyzers (NDA 701/702 and CN 802) are versatile solutions that will help laboratories to obtain results from precious or scarce samples. The nitrogen determination is carried out through a combustion of the sample producing elemental compounds that with reduction and separation processes allow only nitrogen to be detected by a Thermal Conductivity Detector (TCD).

The automatic autosampler has the possibility to be loaded with four discs with 30 positions, each are able to address any throughput requirement. The operator is just required to prepare the samples in practical tin foils and load into the autosampler. Any kind of sample can be loaded, be it solid or liquid, and the VELP analyzer guarantees no memory effect or cross contamination.

The TCD of VELP NDA 702 and CN 802 (Carbon & Nitrogen analyzer) has the lowest LOD of just 0.001 mgN. Thanks to this exclusive detector, it is possible to reduce the sample size to a minimum, optimizing the cost per analysis while retrieving the most accurate and precise results. Maximum reproducibility is guaranteed by the possibility to enable the analyzers for cloud connectivity to benefit from the exclusive features of VELP Ermes platform, such as the remote collection and storage of the data facilitating traceability and reproducibility.

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