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Application notes

Choose among a comprehensive library of Application Notes / White Papers and learn more on how to optimize the performance of your VELP instruments. These documents offer typical analyses of well-known samples, together with official references and suggestions, to make you an expert!

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Routine determination of Total Organic Carbon (TOC) and Total Nitrogen (TN) in environmental samples

Total Organic Carbon (TOC) is a key parameter for assessing soil quality in agriculture, evaluating ecological risks from organic contaminants, and classifying waste for landfill disposal. Determined in compliance with international standards like ISO 10694 or EN 15936, the so-called "direct method" eliminates inorganic carbon with acid treatment before accurately measuring TOC via dry combustion.

Analytical Instruments

Elemental analyzers

Determination of TC and TOC in reference soils samples: an interlaboratory study

The determination of organic carbon plays a fundamental role in the characterization of soils and sediments as its presence or absence can significantly influence the final characteristics of a soil such as the soil structure, water retention, and nutrient availability. Find out how to determine Total Carbon and Total Organic Carbon in soils and sediment samples.

Analytical Instruments

Elemental analyzers

CHNS Determination in reference soil samples

Find out how to determine Carbon, Hydrogen, Nitrogen, and Sulfur in soil samples.

Analytical Instruments

Elemental analyzers

CN 802 - TC and TOC determination in Sludge

Sewage sludge generated from wastewater treatment plants are being merited greater attention in light of their potential for improving soil properties and for providing important nutrient and trace element supplements that are essential for plant growth. TOC determination is important because high levels in soils prevent the anaerobic digestion process and limit the subsoils nitrogen enrichment.

Analytical Instruments

Elemental analyzers

CN 802 - Total Carbon and Nitrogen Determination in Soil

The C:N ratio is important because it has a direct impact on residue decomposition and also nitrogen cycling in soils. The performance of the VELP CN 802 was evaluated by participating in the Proficiency Testing program organized by WEPAL (Wageningen Evaluating Programs for Analytical Laboratories).

Analytical Instruments

Elemental analyzers

N/Protein Determination in Dried Soils - Dumas Combustion Method

Learn how to determine nitrogen in solis. The nitrogen in plants is a part of numerous compounds, including proteins, enzymes, nucleic acids, chlorophyll and vitamins essential for all biological functions.

Analytical Instruments

Elemental analyzers

Nitrogen Determination in Soil - Dumas/Combustion method

Nitrogen fertilization is one of the most important factors of agricultural production. The quantity of nitrogen in the soil must be kept under control to prevent an excessive use.
Learn how to obtain excellent performance with NDA Series and how to work in accordance with AOAC and ISO.

Analytical Instruments

Elemental analyzers

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