SN/T 5308-2021 in English

Technical background and significance of the standard

With the improvement of safety requirements for food machinery lubrication, SN/T 5308-2021 has established a special detection method for the benzene series residual risk in food-grade lubricants. The standard adopts headspace gas chromatography-mass spectrometry technology, with a detection limit of 0.1 mg/kg, covering 5 typical aromatic hydrocarbon compounds.

Analysis of core methods

Key operating points

Method validation data

Six laboratories validated that: at the addition level of 0.5-5 mg/kg, the repeatability limit (r) of benzene was 0.06-0.11 mg/kg, and the reproducibility limit (R) was 0.08-0.16 mg/kg (see Table 1 for details). The RSD of o-xylene at 5 mg/kg level is <5%, which proves the robustness of the method.

Implementation Recommendations

1. Standard solutions should be re-prepared monthly and their linearity verified (r²≥0.995)
2. It is recommended to add m-xylene as a process monitoring compound
3. Regularly calibrate the transfer line temperature of the autoheadspace sampler