|
molecular formula: feso4·7h2o
molecular weight: 278.05
cas no:7782-63-0
properties: sky blue or green monoclinic crystal or crystalline powder. relative density is 1.8987, melting point is 64℃. soluble in water and glycerin, insoluble in alcohol.
uses: as analytical reagent, water purifier, gas purification agent, mordant, herbicide, and etc.
standard: maximum assay of impurities is in %
| item |
analytically pure-ar
|
chemically pure-cp
|
high pure
|
|
assay
|
≥99.0
|
≥98.0
|
98.5-104
|
|
water insoluble matter
|
≤0.005
|
≤0.02
|
——
|
|
ph value
|
——
|
——
|
3.0-4.0
|
|
nitrogen content (n)
|
≤0.001
|
——
|
——
|
|
chloride (cl)
|
≤0.001
|
≤0.005
|
——
|
|
phosphate (po4)
|
≤0.0005
|
≤0.002
|
——
|
|
arsenic (as)
|
≤0.0002
|
≤0.0002
|
≤0.0002
|
|
manganese (mn)
|
≤0.05
|
——
|
——
|
|
high iron (fe)
|
≤0.02
|
≤0.10
|
——
|
|
copper (cu)
|
≤0.002
|
≤0.01
|
——
|
|
zinc (zn)
|
≤0.005
|
≤0.02
|
——
|
|
lead (pb)
|
≤0.002
|
≤0.005
|
≤0.002
|
|
non-sludging to ammonium hydroxide (as sulfate)
|
≤0.05
|
≤0.2
|
——
|
|
magnesium (mg)
|
——
|
——
|
≤0.002
|
|
titanium (ti)
|
——
|
——
|
≤ 0.002
|
|
aluminum (al)
|
——
|
——
|
≤0.02
|
packing: woven bag lined with plastic bag, kraft bag and fiber drum, net weight is 25kg.
|