指标

优等品

合格品

氨基磺酸（NH2SO3H）ω/%                ≥ 

99.5

99.0

硫酸盐（以SO42-计）ω/%                ≤

0.05

0.20

水不溶物ω/%                        ≤

0.02

---

铁（Fe）ω/%                        ≤

0.005

0.01

干燥失重ω/%                        ≤

0.1

---

重金属（以Pb计）ω/%                 ≤

0.001

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