Determination of trace sulfur in organic liquid chemical products. Microcoulometric method (1)

1 Scope

The wood part of GB/T6324 specifies the test method for the determination of trace sulfur in organic liquid products by the microcoulometric method

This part of GB/T6324 is applicable to samples with sulfur content in the range of 0.

2 Normative references

The clauses in the following documents become the clauses of this part through the reference of the wooden part of GB/T6324

GB/T6682-1992 Analysis laboratory water specifications and test methods (neqISO3696; 1987)

GB/T8170-1987 Numerical rounding rules

3 Principles of the method

Samples gasification gasification zone cracking tubes and mixed with a carrier gas mixed into the combustion section and combusting with oxygen, the sulfur is converted into sulfur dioxide , with the carrier gas into the titration cell together with the triiodide ion in the electrolyte (the I _.

The I _.

Titration cell triiodide ion (the I _.

3I ^- → the I _.

Triiodide ion is consumed (the I _.

4 Reagents

Unless otherwise specified, only use reagents confirmed to be analytically pure and secondary water specified in GB/T6682-1992 in the analysis.

4.

4.

4.

4.

4.

4.

4.

Where:

m—The value of the mass of the reference material, in grams (g);

n—The mass fraction of sulfur in the reference material;

V ₁ —The value of the volume of the solvent, in milliliters (mL) (V ₁ =100)
.

4.
8 Standard solution: Use a solvent to dilute the standard stock solution into a series of concentration sulfur standard solutions.
The concentration is represented by C ₁ and the unit is ug/uL.
Standard solutions that meet the requirements can also be purchased
.