稻谷中元素基本符合国家标准限值。（2）在公里网格单元内，土壤与稻谷微量元素含量存在较大空间变异。
And most trace elemental concentrations in rice grain confirm to the limitation of national standards . ( 2 ) There is great variability for trace elements concentrations in soil and rice grain , within the grid of 1km ~ 2 .
基本限值