GB/T 40323-2021 in English

Standard background and scope of application

This standard is formulated to meet the detection needs of three types of cyclic siloxanes (D4, D5, D6) in textile dyeing and finishing auxiliaries. The detection limits of these two methods are both 50mg/kg, filling the gap in the detection standards for organosilicon pollutants in my country's textile chemicals.

Comparison of core detection methods

Key operating points

Technology Evolution Analysis

Compared with the traditional extraction method, the static headspace technology introduced in this standard has three major advantages: ① avoid sample matrix interference; ② reduce organic solvent consumption; ③ high degree of automation. However, it should be noted that the 180℃ equilibrium temperature may affect thermally unstable samples.

Implementation recommendations

1. GC method is preferred for samples with D4 content ＞1000mg/kg
2. Regularly verify the linearity of the standard curve (R²≥0.995)
3. Strictly control the shelf life of the standard solution under 4℃ storage conditions
4. The characteristic ion abundance deviation requirements must be met during mass spectrometry confirmation (see Table C.1)