https://www.crb-gmbh.com/en/2017-2017/ringtrialdetail/129-2017-geopt40-shtx-1
Round-robin test GeoPT 40A - ShTX-1, Calcearous organic-rich shale - CRB GmbH
Quality check XRF analysis by means of round robin and proficiency tests | Results Round-robin test GeoPT 40A - ShTX-1, Calcearous organic-rich shale - CRB GmbH