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molecular formula: na2so4
molecular weight: 142.04
cas no:15124-09-1
properties: white crystalline powder. relative density is 2.68 and melting point is 884℃. soluble in water and glycerin, insoluble in ethyl alcohol.
uses: as analytical reagent, dehydrant, interfere inhibitor in atomic absorption spectrum analysis, accessory for drugs and foods.
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(na2so4) /%
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≥99.0
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≥98.0
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≥99.0
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ph value(50g/l solution, 25℃)
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5.0~8.0
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5.0~8.0
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5.0~8.0
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clarity test
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qualified
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qualified
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qualified
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water insoluble matter
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≤0.005
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≤0.02
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≤0.02
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loss on ignition
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≤0.2
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≤0.5
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≤0.5
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chloride (cl)
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≤0.001
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≤0.005
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≤0.005
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phosphate (po4)
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≤0.001
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≤0.002
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—
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total nitrogen (n)
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≤0.0005
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≤0.001
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≤0.002
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potassium (k)
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≤0.01
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－
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—
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calcium (ca)
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≤0.002
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≤0.005
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—
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iron (fe)
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≤0.0005
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≤0.001
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≤0.001
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heavy metal (pb)
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≤0.0005
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≤0.002
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≤0.001
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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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