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Sodium hydroxide
|
No.
|
Testing item
|
Analytically pure
(Second grade) |
Chemically pure
(third grade) |
|
1
|
Content (NaOH),%
|
≥96.0
|
≥95.0
|
|
2
|
Content(Na2CO3),%
|
≤1.5
|
≤3.0
|
|
3
|
Clearance test
|
Qualified
|
Qualified
|
|
4
|
Chlorine (Cl),%
|
0.005
|
0.01
|
|
5
|
Sulfate (SO4),%
|
0.005
|
0.02
|
|
6
|
Total nitrogen(N),%
|
0.001
|
0.002
|
|
7
|
Phosphorus acid salt (PO4),%
|
0.001
|
0.002
|
|
8
|
Silicate(SiO3),%
|
0.01
|
0.05
|
|
9
|
(Al),%
|
0.002
|
0.005
|
|
10
|
(K),%
|
0.05
|
--------
|
|
11
|
(Ca),%
|
0.01
|
0.05
|
|
12
|
(Fe),%
|
0.001
|
0.002
|
|
13
|
Heavy metal (Pb),%
|
0.003
|
0.003
|
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