Thirty‐one geochemical reference samples have been analysed for Ag, B, Ge, Mo, Sn, Tl and W by atomic emission spectrographic techniques with air‐jet controlled d.c. arc. The paper presents description of techniques and the data are compared to those from other studies.

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Reference samples of rocks from the Institute of Geochemistry, Irkutsk (IGI) and the Research Institute of Applied Physics, Irkutsk University (RIAP) and silicate rocks from the GeoPT proficiency testing series were analysed with the aim of determining Ag, B, Ge, Mo, Sn, Tl and W abundances by an atomic‐emission method with air‐stabilized D.C. arc excitation. Many of the results reported are without recommended or assigned values. The results are compared with compilation data from the literature and, where possible, with assigned values for samples of the GeoPT series.

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