从资料上见到的国外列有痕量元素推荐值的地质标样愈来愈多.下列50种元素(或成份)的推荐值是目前已发行标样中含量最低的数值(括号内的数字除注明者外,单位均是ppm).可供研制地质标样及制订标准方法时参考.(关于国外地质标样的一般情况,请见《矿石分析译文》1980年第二期).Ag(50ppb,ASK-1)、As(0.7MRG-1)、Au(0.8ppb,BCR-1)、B(4,BCR-1)、Ba(19,SG-1A)、Be(1,ST-1A)、Bi(220,GnA)、非碳酸盐碳(280,SGD-1A)、总碳(630,SGD-1A和ST-1A).Cd(150ppb,W-1)、Ce(50,GXR-2)、C1(14,ASK-2)、Co(1,SGD- The number of geological reference samples listed abroad with trace element recommendations is increasing, and the recommended values ​​for the following 50 elements (or components) are those with the lowest content in the currently issued standard (numbers in brackets Unless otherwise stated, all units are in ppm.) For reference for the development of geological standards and for the development of standard methods (for the general case of geological samples abroad, see “Ore Analysis”, Issue 2, 1980) .Ag As (0.7 MRG-1), Au (0.8 ppb, BCR-1), B (4, BCR- 1), Ba (19, SG- 1A), Be (1, ST- 1A), Bi (220, GnA), non-carbonate carbon (280, SGD-1A), total carbon (630, SGD-1A and ST- GXR-2), C1 (14, ASK-2), Co (1, SGD-