Analytical Suite Metadata

GSC colorimetry: Cu, Pb, Zn

Geological Survey of Canada, colorimetry using dithizone, to determine Cu, Pb, Zn, potassium bisulphate fusion

General Methodology:

Colorimetric analysis of Cu, Pb and Zn using dithizone, C13H12N4S, is described in detail by Margaret (Peggy) A. Gilbert (1959), GSC Paper 59-3. Gilbert describes two sample digestion methods: (1) nitric acid dissolution and (2) potassium pyrosulphate fusion.  The marginal notes for GSC maps 45-1965 (Pb), 47-1965 (Zn) and 50-1965 (Cu) indicate that sample digestion used potassium bisulphate.

Stanton (1966) states:

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.]

Instrument: unstated

Sample material: solid

Sample weight: unstated

Analytical Technique:

Hierarchical classification

Technique >> Photometry >> Colorimetry >> Dithizone



Analytical Decomposition:

Hierarchical classification

Decomposition >> Fusion >> Acidic >> K2S2O7



Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  2497     Cu_Col  4
2  2498     Pb_Col  5
3  2499     Zn_Col  5

Associated Analytical Packages:

IndexPackage IDPackage Name
1  272     GSC spectrography and colorimetry
Date modified: