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The preparation and characterisation of certified reference materials of four selenium‐rich rocks (GBW07397 to GBW07400) are described in this paper. The raw materials were derived from selenium‐rich rocks in two famous seleniferous regions, Enshi Prefecture, Hubei Province and Ziyang County, Shaanxi Province, China. Sample homogeneity and stability were tested by inductively coupled plasma‐mass spectrometry...