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Institute of Inorganic and Analytical Chemistry
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Elemental Analysis

VARIO micro cube by Elementar

Elemental analysis of the elements: C, H, N, S
Detector: Thermal conductivity detector (WLD)
Sample weight: 1–10
mg Temperatures: Combustion tube approx. 1150°C Reduction tube approx. 850°C

Measuring range:

  • Carbon 0–7 mg abs.
  • Hydrogen 0–1 mg absolute
  • Nitrogen 0–10 mg absolute
  • Sulfur 0–2 mg absolute

Brief description:
The atmosphere inside the combustion tube is enriched with oxygen. The elements C, H, N, and S bound in the sample burn to form the following gaseous reaction products: CO₂, H₂O, N₂, NOx, SO₂, SO₃. Halogens bound in the sample react to form volatile halogen compounds. The carrier gas stream transports the gaseous combustion products into the reduction tube, where the following processes take place: Nitrogen oxides (NOx) are completely reduced to N₂ at the copper contact. SO₃ is reduced to SO₂. Volatile halogen compounds are adsorbed onto silver wool. The separation of the reaction products takes place in an adsorption column that is subjected to a temperature profile. The VARIO micro is calibrated using, for example, acetanilide or sulfanilic acid.