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molecular formula: znso4·7h2o
molecular weight: 287.54
cas no:7733-02-0
properties: colorless crystal. relative density is 1.957. easily soluble in water, insoluble in ethyl alcohol.
uses: analytical reagent, mordant, electronic component production and pharmaceutical industry.
standard: maximum assay of impurities is in %
| specification/item |
analytically pure-ar
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chemically pure-cp
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high pure
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assay
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≥99.5
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≥99.0
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≥99
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clarity test
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qualified
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qualified
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—
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ph value
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4.4-6.0
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4.4-6.0
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4.4-6.0
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water insoluble matter
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≤0.01
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≤0.01
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≤0.02
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chloride (cl)
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≤0.0005
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≤0.002
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≤0.05
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total nitrogen (n)
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≤0.001
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≤0.002
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≤0.05
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arsenic (as)
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≤0.00005
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≤0.0002
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≤0.0002
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manganese (mn)
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≤0.0003
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≤0.001
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-
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iron (fe)
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≤0.0005
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≤0.002
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≤0.002
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copper (cu)
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≤0.001
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≤0.005
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-
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cadmium (cd)
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≤0.0005
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≤0.002
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-
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lead (pb)
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≤0.001
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≤0.01
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≤0.01
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non-sludging to ammonium sulfide (as sulfate)
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≤0.05
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≤0.02
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≤0.05
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packing: woven bag lined with plastic bag, kraft paper bag, or fiber drum, net weight is 25kg.
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