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Item
|
Excellent grade
|
First grade
|
Qualified product
|
Purity % ≥
|
99.5
|
99.0
|
98.5
|
Na2CO3 % ≥
|
0.01
|
0.3
|
0.5
|
NaOH % ≤
|
0.01
|
0.3
|
0.5
|
NaCL (ppm) ≤
|
150
|
150
|
150
|
Na2S (ppm) ≤
|
20
|
20
|
20
|
Fe3+ (ppm) ≤
|
20
|
20
|
20
|
PH(30%in water solution)
|
8-11
|
9-12.5
|
9-12.5
|
Color(30%in water,APHA)
|
10
|
15
|
15
|
Odor
|
odorless
|
odorless
|
odorless
|
Solubility in water
(30% solution)
|
Clear and transparent without visible impurity after one week deposition
|
Clear and transparent without visible impurity after 16 hours deposition
|
Clear and transparent without visible impurity after 16 hours deposition
|
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