LTB-1 pyrrhotite and LTB-2 pyrite have been adopted as the national standards for sulfur isotopic geology in China since Feb.1,1978.These smaples have been measured by reference to the world-wide standard CDT(Troilite),giving values of δ34S of 0.3±0.1‰ and +1.8±0.2‰ for LTB-1 and LTB-2 respectively.
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