IAEA-S-4 , Sulfur

Materials with known 34S/ 32S isotopic composition

  • International Chemical Safety Card (ICSC): ICSC_1166

IAEA-S-4 (Soufre de Lacq) is elemental sulfur derived from natural gas and was prepared by E. Roth, Centre d’Etudes Nucléaires de Saclay, France. It served as international reference material for more than 20 years, before its distribution was terminated by IAEA because of doubts about its isotopic homogeneity. New studies have demonstrated its homogeneity and suitability as reference material [1,2]. The isotopic values of the reference material IAEA-S-4 are the results of the statistical evaluation of interlaboratory comparisons.

Analyte Value Unit SD R/I/C
δ34S +16.9 VCDT 0.2 R

(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)


  1. CARMODY, R.W., SEAL II, R.R., Evaluation of the sulfur isotopic composition and homogeneity of the Soufre de Lacq reference material. Chemical Geology 153 1-4 (1999) 289-295.

  2. QI, H.P., COPLEN, T.B., Evaluation of the 34S/32S ratio of Soufre de Lacq elemental sulfur isotopic reference material by continuous flow isotope-ratio mass spectrometry, Chemical Geology 199 1-2 (2003) 183-187.


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