介绍16种有机标准物质的研制方法。
Development and preparation about 16 kinds of organic reference materials were described.
介绍有机标准物质的国内外现状，论述有机标准物质的制备和定值方法。
The status of the organic reference materials at home and abroad is introduced, and methods of the preparation and certification of the organic reference materials are discussed.
按NOP规定，要经过 认证的土地须按标准经营，而且在第一次有机农产品成熟前的3年（的时间）内不能使用被禁止的物质。
Land to be certified according to NOP must be managed according to the standard, and must not have received prohibited substances during 3 years before the first organic harvest.
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