C – Carbon

C – Carbon

C – Carbon

The carbon analysis is based on various combustion methods in oxygen. The aim is a complete oxidation of the carbon to carbon dioxide. For this purpose, methods with temperatures of up to 1300°C are used, depending on the sample matrix. For the analysis of compounds that are difficult to combust, melt-forming or combustion-accelerating additives and variable heating times are used. The detection of the released carbon dioxide is performed conductometrically or by infrared spectroscopy.

The determination of carbon in the form of carbonate-C is also performed conductometrically after acid extraction and carbon dioxide absorption.

A distinction between inorganic (TIC) and organic (TOC) bound carbon can be done. The organic carbon (TOC) is determined as the difference between the two analyzed parameters “total carbon” (TC) and “inorganic carbon content” (TIC).

Which concentrations can be determined?

Carbon can be analyzed as major, minor and trace component. Determination limits of a few mg/kg are possible depending on the sample matrix.

Which sample matrix can be analyzed?

Almost all solid and liquid matrices can be analyzed.

What are typical tasks?

  • C-determination as main or minor component of organic or organometallic compounds
  • C-determination of SiC, SiC-forming polymers or ceramics
  • C-trace-determination of metals, semiconductors or superconductors
  • Carbonate-C-determination of soil or rock samples

Which sample quantity is required for the analysis?

C as major component: ≥ 0.5 mg
C as trace component (few mg/kg): approx. 100 mg / matrix dependent

Which methods are available?

  • Various combustion methods with conductometric detection
  • Various combustion methods with infrared spectroscopic detection
  • Acid extraction with conductometric detection
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