GB/T 28190-2011Textiles - Determination of dimethyl fumarate (English PDF)

3.1

Unless otherwise indicated, the reagents used in the analysis were of analytical grade.

3.2 ethyl acetate

through 5A ° molecular sieve dehydration process. 5A ° molecular sieves in 500 °C muffle furnace burning 2h, until the furnace temperature dropped to 100 °C

Hereinafter, fitted out into the rear of the dryer to cool anhydrous silica, at a ratio of 250g/500mL of ethyl acetate was added to just unsealed,

24h after standing aside.

3.3

dimethyl fumarate standards (dimethylfumarate, CAS Registry Number 624-49-7). Purity >=99%.

3.4 standard stock solution

Weigh the appropriate amount of dimethyl fumarate standard (3.3), preparation of a concentration with ethyl acetate (3.2) as

1000mg/L of standard stock solution.

NOTE. In the refrigerator at 4 °C under dark storage conditions, valid standard stock solution is 12 months.

3.5 Standard working solution

If necessary, the standard stock solution was diluted to the appropriate concentration of standard working solution with ethyl acetate (3.2).

NOTE. In the refrigerator at 4 °C under dark storage conditions, valid standard working solution is 3 months.

4.1 Gas chromatography - mass spectrometry

with EI source.

4.2 ultrasonic generator

operating frequency of 40kHz.

4.3

rotary evaporator.

4.4

Analytical balance, precision 0.0001g.

4.5 stoppered conical flask

100mL.

4.6 round-bottomed flask

250mL.

4.7 The organic phase filtration membranes

0.45µm.

Step 5 Analysis

5.1 Extraction

Select a representative sample was cut to 5mm × 5mm or less, after which said mixing takes 2g, accurate to 0.01g, set stoppered Erlenmeyer flask

END: Draft Version (GB/T 28190-2011)

GB/T 29865-2024 | GB/T 28189-2023 | GB/T 30126-2013 | GB/T 20385.2-2026 | GB/T 11047.4-2026 |

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