GB/T 24153-2009Rubber and elastomer materials - Determination of N-nitrosamines (English PDF)

Foreword

This Standard's Appendix A is normative; while Appendix B is informative.

1 Scope

This Standard specifies adopting gas chromatography - mass selective detector (GC- MSD) to determine 12 types of N-nitrosamines (see Appendix A) contents in the rubber and elastomer.

This Standard is applicable to the rubber, elastomer materials and their products.

2 Principle

The sample was extracted by methanol; after concentrating, the extracting solution passes through C18 solid-phase extraction column to purify; the sample solution enters into the gas chromatography - mass selective detector (GC-MSD) to be measured; qualified by full-scanning detection; select ions to quantify by external standard method.

3 Reagents and Materials

Unless otherwise is specified, all the reagents used are chromatographic pure.

3.1 Methanol, the blank test check there are no interfering substances.

3.2 C18 solid-phase extraction column. 500mg/3mL.

3.3 Standard stock solution. separately and accurately weigh the appropriate amount of each N-nitrosamines standard products; use methanol to prepare the standard stock solution with concentration of 200mg/L; inject into the brown reagent bottle; store in the refrigerator at 5°C below; and valid for 3 months.

4 Apparatus

4.1 Gas chromatograph. equipped with mass selective detector (MSD).

4.2 Ultrasonic generator. operating frequency of 40kHz.

4.5 Vortex mixer.

4.6 Conical flask. brown, with ground stopper, 100mL.

4.7 Concentrated bottle. brown, 150mL.

4.8 Centrifuge tube. brown, 10mL.

5 Analytical Procedures

6 Result calculation

Each N-nitrosamines content in the sample shall be calculate as per Formula (1).

7 Determination Lower Limit

The determination lower limit of this method is 0.5mg/kg.

8 Test Report

The test report shall give the following contents at least. […]