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. 2016 Apr 14;6:24309. doi: 10.1038/srep24309

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This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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GSS-1 and GSD-12 are geological reference materials. GSS-1 is a dark brown podzolitic soil, typical of the mountainous terrain of Northeast China. The underlying granitic bedrock is a part of a lead-zinc mineralisation district. GSD-12 stream sediment is from a tributary draining river in the Yangchun ore field (Cu, W, Sn), Guangdong, China.