BS ISO 20917标准规定了一种使用中性柠檬酸盐提取的可用磷和可溶性钾的测定和ICP-OES定量的方法。该方法适用于土壤、肥料和其他土壤样品中可用磷和可溶性钾的测定。该标准的目的是提供一种准确、可重复和可比较的方法，以测定土壤和肥料中的可用磷和可溶性钾含量。

该标准要求使用中性柠檬酸盐提取土壤和肥料中的可用磷和可溶性钾。提取液的pH值应在6.0至7.0之间。提取液中的可用磷和可溶性钾含量应使用ICP-OES进行定量分析。该标准还规定了样品的准备、提取和分析的详细步骤。

该标准的实施需要使用一些特殊的设备和试剂，包括中性柠檬酸盐提取液、ICP-OES仪器和标准参考物质。在实施该标准时，应遵循所有相关的安全和环境规定。

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