|
molecular formula: mgcl2·6h2o
molecular weight: 203.30
cas no: 7791-18-6
properties: colorless crystal. relative density is 1.56, melting point is 118℃. soluble in water and ethyl alcohol.
uses: in analytical reagent, dialysis powder and dialysis solution in pharmaceutical industry.
standard: maximum assay of impurities is in %
| specification/item |
analytically pure-ar
|
chemically pure-cp
|
high pure
|
usp
|
|
assay (mgcl2·6h2o) /%
|
≥98.0
|
≥98.0
|
98.0-101.0
|
98.0-101.0
|
|
ph(50g/l solution, 25℃)
|
5.0~6.5
|
5.0~6.5
|
5.0~6.5
|
4.5-7.0
|
|
clarity test
|
qualified
|
qualified
|
－
|
—
|
|
water insoluble matter
|
≤0.005
|
≤0.01
|
≤0.01
|
≤0.005
|
|
sulfate (so4)
|
≤0.005
|
≤0.01
|
≤0.01
|
≤0.005
|
|
phosphate (po4)
|
≤0.001
|
≤0.002
|
－
|
|
|
total nitrogen (n)
|
≤0.005
|
≤0.01
|
－
|
|
|
potassium (k)
|
—
|
—
|
—
|
qualified
|
|
calcium (ca)
|
≤0.05
|
≤0.1
|
qualified
|
|
|
iron (fe)
|
≤0.0005
|
≤0.001
|
≤0.001
|
—
|
|
barium and strontium (as ba)
|
≤0.005
|
≤0.005
|
－
|
qualified
|
|
heavy metal (pb)
|
≤0.0005
|
≤0.001
|
≤0.001
|
≤0.001
|
|
arsenic (as)
|
－
|
－
|
≤0.0005
|
≤0.0003
|
|
acidity or alkalinity
|
－
|
－
|
qualified
|
—
|
|
lead (pb)
|
－
|
－
|
≤0.0005
|
qualified
|
|
organic matter
|
|
－
|
|
qualified
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packing: woven bag lined with plastic bag, kraft bag and fiber drum, net weight is 25kg.
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