Keyword Definition

Potassium bisulphate and pyrosulphate are virtually identical in their behaviour, as may be seen from the equations showing their decomposition by heat:

  • 2 KHSO4→ K2S2O7 + H2

  • K2S2O7→ K2SO4 + SO3 

In both cases sulphur trioxide is the effective attacking agent, acting in a medium of molten potassium sulphate.


  • Stanton, R.E. (1966). Rapid methods of trace analysis for geochemical applications.


Hierarchical classification

Decomposition >> Fusion >> Acidic >> K2S2O7



Category: Decomposition techniques

The different kinds of analytical decompositions have been classified hierarchically. Examples: “fusion”, “acid” Taken from the “Analytical_Decompositions_SHARED” database table.

Associated Analytical Suites:

IndexSuite IDSuite Name
1  10     Chemex/TSD 2 micron COL
2  579     GSC colorimetry: Cu, Pb, Zn

Associated Analytical Packages:

IndexPackage IDPackage Name
1  9     Chemex / TSD 2 micron (1)
2  33     Chemex / TSD 2 micron (6)
3  272     GSC spectrography and colorimetry
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