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2017/2018营养盐国际比对
发布日期:2018-11-16      浏览次数:257

2017/2018海水标准营养盐参考物质国际比对

       为了提高营养盐数据的质量,加强营养盐数据在国际上的权威性,MEL营养盐功能实验室于201712月参与了由IOCCP(The international ocean carbon coordination project)JAMATEC(Japan agency for marine=-earth science and technology)联合组织的 “2017/18 inter-laboratory comparison exercise of Certified Reference Material of Nutrients in Seawater, CRM”, 本次国际比对共有来自31个国家71个海洋化学实验室参与,中国共有2家单位参与。MEL所有RMNS比对结果与国际上其他优秀的实验室具有可比性,对与比对的8个盲样中,4个样品的结果值落于对比平均值的±1SD之内,3个样品结果值落于对比平均值的±1.5SD之内。MEL测定结如下图红色框内所示:

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       为了与其他实验室进行比较,选取3个美国比较出名的海洋化学实验室的Z-score 值进行比较,其结果如下表所示:

The Z-score for each analysis is defined as

Zpar = ABS((Cpar – Cconsensus)/Ppar)

    Where Zpar is the Z-score for an analysis; Cpar is the concentration of an RMNS

sample measured by a laboratory for the parameter of interest (nitrate, phosphate, or

silicate); Cconsensus is the consensus sample concentration for the parameter of interest,described in section 4.1; and Ppar is the standard deviation at the sample concentrationfor the parameter of interest. (:Z-score的值越低越理想)