This testing work primarily adheres to national mandatory standards and recommended methodologies. Its core basis is the *National Food Safety Standard for the Use of Food Additives* (GB 2760), which stipulates the scope of application, functional purposes, and maximum residue limits for nitrous oxide when used as a food additive.
Regarding specific testing methodologies, reference may be made to relevant industry standards or national recommended methods-such as the *Determination of Nitrous Oxide Propellant in Food: Headspace Gas Chromatography Method*-among others. On an international level, reference may also be drawn from standards published by the Codex Alimentarius Commission or relevant methods established by the ISO. These standards and specifications provide a unified framework encompassing operational procedures, technical requirements, and criteria for result interpretation, thereby ensuring the authoritative nature and comparability of the testing results.
