China Sodium Metabisulfite 97 Percent Min

Appearance:White crystalline powder

CAS No:7681-57-4

EINECS No:231-673-0

Synonyms:Sodium Pyrosulfite, SMBS

Molecular Formula:Na2S2O5

Molecular Weight:190.107

Melting Point:150℃ (Decomposed)

Density:1.48 g/cm³

Accurate Mass:189.898254

Water Solubility:540g/L (20 ℃)

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Qingdao Tianya Chemical Co., Ltd is one of the main producers and suppliers of Sodium Metabisulfite in China, we are supplying Sodium Metabisulfite 97% Min to wide application fields.

Assay Testing of Sodium Metabisulfite:

Reagents And Materials:

1. Iodine standard titration solution:

2. Ice acetic acid solution:1+3;

3. Sodium thiosulfate standard titration solution: c (Na2S203) approximately 0.1mol/L;

4. Soluble starch solution: 5g/L;

Analysis Steps: 

1. Transfer 50ml of iodine standard titration solution to an iodine

volumetric flask. Dissolve about 0.2g sample, accurate to 0.0002g, added to the iodine solution, stoppered, frozen, put it in the dark place for 5 minutes.

Added to 5ml of glacial acetic acid solution, titration with sodium thiosulfate standard titration solution, when near the end, add 2ml soluble starch solution and continue titration until the solution blue color disappears as the end point.

2. At the same time take 50 ml iodine standard titration solution, blank test in the same conditions.

Results Calculation:

Main content of sodium metabisulfite (Na2S2O5) the mass fraction of W1 and its value is expressed in%, according to equation (A.1):

sodium metabisulfite main content equation

Notice:

V0-Blank test of sodium thiosulfate standard titration solution consumed volume, the unit is ml (ml);

V1-Titration test solution of sodium thiosulfate standard titration solution consumed volume, the unit is ml (ml);

c-The concentration of sodium thiosulfate standard titration solution accurate numerical, unit for moles per liter (mol/L);

m-The Numerical of the sample quality, the unit is gram (g);

M-A quarter sodium metabisulfite (1/4 Na2S2O5) numerical of molar mass, units of grams per mole (g/mol) (M = 47.52).

Take the arithmetic mean of the parallel determination results of the measurement results, the absolute difference between the two parallel determination results is not more than 0.2%.

Sodium Metabisulfite Food Grade Specifications:

Items Specification
Purity (As Na2S2O5 ) 97% Min
Sulfur Dioxide (SO2) 65% Min
Heavy Metal (Pb) 0.0005% Max
Arsenic (As) 0.0001% Max
Selenium (Se) 0.0005% Max
Iron (Fe) 0.001% Max
Water Insoluble 0.02% Max
PH Value 4.0-4.8

Sodium Metabisulfite Industrial Grade Specifications:

Items Specification
Purity (As Na2S2O5 ) 97% Min
Sulfur Dioxide (SO2) 65% Min
Iron (Fe) 0.005% Max
Arsenic (As) 0.0001% Max
Water Insoluble 0.05% Max
PH Value 4.0-4.8

China Sodium Metabisulfite 97 Percent Min

Appearance:White crystalline powder

CAS No:7681-57-4

EINECS No:231-673-0

Synonyms:Sodium Pyrosulfite, SMBS

Molecular Formula:Na2S2O5

Molecular Weight:190.107

Melting Point:150℃ (Decomposed)

Density:1.48 g/cm³

Accurate Mass:189.898254

Water Solubility:540g/L (20 ℃)

Category:

Get a Quote

Qingdao Tianya Chemical Co., Ltd is one of the main producers and suppliers of Sodium Metabisulfite in China, we are supplying Sodium Metabisulfite 97% Min to wide application fields.

Assay Testing of Sodium Metabisulfite:

Reagents And Materials:

1. Iodine standard titration solution:

2. Ice acetic acid solution:1+3;

3. Sodium thiosulfate standard titration solution: c (Na2S203) approximately 0.1mol/L;

4. Soluble starch solution: 5g/L;

Analysis Steps: 

1. Transfer 50ml of iodine standard titration solution to an iodine

volumetric flask. Dissolve about 0.2g sample, accurate to 0.0002g, added to the iodine solution, stoppered, frozen, put it in the dark place for 5 minutes.

Added to 5ml of glacial acetic acid solution, titration with sodium thiosulfate standard titration solution, when near the end, add 2ml soluble starch solution and continue titration until the solution blue color disappears as the end point.

2. At the same time take 50 ml iodine standard titration solution, blank test in the same conditions.

Results Calculation:

Main content of sodium metabisulfite (Na2S2O5) the mass fraction of W1 and its value is expressed in%, according to equation (A.1):

sodium metabisulfite main content equation

Notice:

V0-Blank test of sodium thiosulfate standard titration solution consumed volume, the unit is ml (ml);

V1-Titration test solution of sodium thiosulfate standard titration solution consumed volume, the unit is ml (ml);

c-The concentration of sodium thiosulfate standard titration solution accurate numerical, unit for moles per liter (mol/L);

m-The Numerical of the sample quality, the unit is gram (g);

M-A quarter sodium metabisulfite (1/4 Na2S2O5) numerical of molar mass, units of grams per mole (g/mol) (M = 47.52).

Take the arithmetic mean of the parallel determination results of the measurement results, the absolute difference between the two parallel determination results is not more than 0.2%.

Sodium Metabisulfite Food Grade Specifications:

Items Specification
Purity (As Na2S2O5 ) 97% Min
Sulfur Dioxide (SO2) 65% Min
Heavy Metal (Pb) 0.0005% Max
Arsenic (As) 0.0001% Max
Selenium (Se) 0.0005% Max
Iron (Fe) 0.001% Max
Water Insoluble 0.02% Max
PH Value 4.0-4.8

Sodium Metabisulfite Industrial Grade Specifications:

Items Specification
Purity (As Na2S2O5 ) 97% Min
Sulfur Dioxide (SO2) 65% Min
Iron (Fe) 0.005% Max
Arsenic (As) 0.0001% Max
Water Insoluble 0.05% Max
PH Value 4.0-4.8

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