Granular powder or white,deliquescent crystals or granules
鉴别试验
Identification
Pass test
Pass test
含量
Assay
%
As Ca 15.9-17.7 (Monohydrate) 16.8-18.3 (Anhydrous)
≥95%(On the dried basis)
P2O5(干基计)
P2O5(anhydrous basis)
%
-
55.5-61.1
氧化钙
CaO(105℃,4hours)
-
23.0-27.5%(Anhydrous) 19.0-24.8%(Monohydrate)
砷
As
≤mg/kg
3
1
氟
F
≤mg/kg
50
30(expressed as fluorine)
铅
Lead
≤mg/kg
2
1
镉
Cadmium
≤mg/kg
-
1
汞
Mercury
≤mg/kg
-
1
铝
Aluminium
-
Not more than 70 mg/kg(only if added to food for infants and young children) Not more than 200 mg/kg (for all usesexcept food for infants and youg children)
干燥失重
Loss on drying
≤1%(Monohydrate)
Anhydrous:not more than 14%(105℃,4hours) Monohydrate:not more than 17.5%(105℃,4hours)
灼烧失重
Loss on ignition
14.0-15.5(Anhydrous)
Anhydrous:not more than 17.5%(afterignition at 800℃±25℃for 30minutes) Monohydrate:not more than 25.0%(determined by dryin at105℃ for one hour,then ignite at 800℃±25℃ for 30 minutes)