干燥失重 Loss on dry ≤5.0% 銅(Cu) Copper≤25ppm 鉛(Pb) Lead ≤20ppm 硫酸鹽 Sulfate ≤0.04% 酸堿度 Potential of hydrogen(PH) 60 ~ 80 硝酸鹽 Nitrate 按照標(biāo)準(zhǔn)Accord with require 含氨量 Content of ammonia 2% ~ 6%
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