This standard replaces the determination of sulfur dioxide in SN/T 2827-2011 “Food contact materials for export - Wood materials - Determination of sulfur dioxide”.

Compared with SN/T 2827-2011, the major changes of this standard are as follows:

——the name of this standard has been revised to “National food safety standard Food contact materials and articles Determination of sulfur dioxide in wood materials”;

——the “Summary of the Methods” in Method I has been revised to “Principles”;

——the “Calculation and expression of the results” in Method I has been revised to “expression of analysis results”;

——the calculation formula in Method I has been revised.

——the “Summary of the Methods” in Method II has been revised to “Principles”, and the text content has been revised;

——the “Calculation and expression of the results” in Method II has been revised to “expression of analysis results”, and the text content has been revised.