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CAS NO. 7757-83-7 |
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SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S1) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White Crystalline Powder |
2. |
Assay as Na2SO3% by mass |
98% Min. |
3. |
PH of 10% Solution |
9.5 – 11 |
4. |
Clearity of 10% Solution |
Clear and Colourless |
5. |
Insoluble Matter |
0.05% Max. |
6. |
Iron ( as Fe) |
50ppm Max. |
7. |
Heavy Metal ( as Pb) |
15ppm Max. |
8. |
Thiosulphate |
200 ppm Max. |
9. |
Free Alkali |
0.1% Max. |
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SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S2) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White Crystalline Powder |
2. |
Assay as Na2SO3% by mass |
96% Min. |
3. |
PH of 10% Solution |
9.5 – 11 |
4. |
Clearity of 10% Solution |
Clear and Colourless |
5. |
Insoluble Matter |
0.05% Max. |
6. |
Iron ( as Fe) |
50ppm Max. |
7. |
Heavy Metal ( as Pb) |
15ppm Max. |
8. |
Thiosulphate |
200 ppm Max. |
9. |
Free Alkali |
0.15% Max. |
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SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S7) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
Pale Yellow Powder |
2. |
Assay as Na2SO3% by mass |
95 to 97% |
3. |
PH of 10% Solution |
5 – 6PH |
4. |
Clearity of 10% Solution |
Slight Hazzy |
5. |
Insoluble Matter |
0.05% Max. |
6. |
Iron ( as Fe) |
50ppm Max. |
7. |
Heavy Metal ( as Pb) |
15ppm Max. |
8. |
Thiosulphate |
200 ppm Max. |
9. |
Free Alkali |
0.5% Max. |
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SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S8) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White to Pale Yellow Powder |
2. |
Assay as Na2SO3% by mass |
95% Min. |
3. |
PH of 10% Solution |
6-7PH |
4. |
Clearity of 10% Solution |
Slight Hazzy |
5. |
Insoluble Matter |
0.05% Max. |
6. |
Iron ( as Fe) |
50ppm Max. |
7. |
Heavy Metal ( as Pb) |
15ppm Max. |
8. |
Thiosulphate |
200 ppm Max. |
9. |
Free Alkali |
0.5% Max. |
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SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S3) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White Crystalline Powder |
2. |
Assay as Na2SO3% by mass |
94 to 96% |
3. |
PH of 10% Solution |
9.5 – 11 |
4. |
Clearity of 10% Solution |
Clear and Colourless |
5. |
Insoluble Matter, Max. |
0.05% |
6. |
Iron ( as Fe) Max. |
50ppm |
7. |
Heavy Metal ( as Pb) Max. |
15ppm |
8. |
Thiosulphate Max. |
200 ppm |
9. |
Free Alkali Max. |
0.15% |
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SPECIFICATION OF SODIUM SULPHITE
(Co. Code No. S4) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White Crystalline Powder |
2. |
Assay as Na2SO3% by mass |
92 to 94% |
3. |
PH of 10% Solution |
9.5 – 11 |
4. |
Clearity of 10% Solution |
Clear and Colourless |
5. |
Insoluble Matter |
0.05% Max. |
6. |
Iron ( as Fe) |
50ppm Max. |
7. |
Heavy Metal ( as Pb) |
15ppm Max. |
8. |
Thiosulphate |
200 ppm Max. |
9. |
Free Alkali |
0.15% Max. |
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SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S5) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White to Offwhite Powder |
2. |
Assay as Na2SO3% by mass |
90% Min. |
3. |
PH of 10% Solution |
9.5 – 11 |
4. |
Clearity of 10% Solution |
Slight Hazzy |
5. |
Insoluble Matter |
0.05% Max. |
6. |
Iron ( as Fe) |
50ppm Max. |
7. |
Heavy Metal ( as Pb) |
15ppm Max. |
8. |
Thiosulphate |
200 ppm Max. |
9. |
Free Alkali |
0.5% Max. |
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| SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S6) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White to Offwhite Powder |
2. |
Assay as Na2SO3% by mass |
80 - 88% |
3. |
PH of 10% Solution |
9.5 – 11 |
4. |
Clearity of 10% Solution |
Slight Hazzy |
5. |
Insoluble Matter, Max. |
0.05% |
6. |
Iron ( as Fe) Max. |
50ppm |
7. |
Heavy Metal ( as Pb) Max. |
15ppm |
8. |
Thiosulphate Max. |
200 ppm |
9. |
Free Alkali |
0.5% Max. |
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SPECIFICATION OF SODIUM SULPHITE (Co. Code No. S9) |
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Sr.
No. |
Characteristics |
Specifications |
1. |
Physical Appearance |
White to Off White Powder |
2. |
Assay as Na2SO3% by mass |
45 to 50% Min. |
3. |
PH of 10% Solution |
6-8PH |
4. |
Clearity of 10% Solution |
Slight Hazzy |
5. |
Insoluble Matter |
0.05% Max. |
6. |
Iron ( as Fe) |
50ppm Max. |
7. |
Heavy Metal ( as Pb) |
15ppm Max. |
8. |
Thiosulphate |
200 ppm Max. |
9. |
Free Alkali |
0.5% Max. |
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