Product Description:

The azo dye specific column uses diatomaceous earth treated with special technology, which has the maximum specific surface area and balanced surface activity, providing an ideal support surface for liquid-liquid distribution, ensuring the detection sensitivity and stability of aromatic amine substances.

Modern loading techniques can ensure stable column beds and excellent flow rates. After numerous customer verifications, the product meets the testing requirements for 24 prohibited azo dyes in textiles as specified in GB/T17592-2011.

Operation method:

1. Sampling and preparation:

Cut the sample into small pieces and mix them. Weigh 1 g and place it in the reactor. Add 16 mL of citrate buffer solution preheated to 70 ℃. Seal the reactor and shake it to immerse all samples in the liquid. Place it in a water bath and keep it at 70 ℃ for 30 minutes. Then open the reactor, add 3 mL of sodium hydrosulfite solution, and immediately seal and shake. Keep the reactor in a 70 ℃ water bath for 30 minutes, and cool to room temperature within 2 minutes after removal.

2. Extraction:

Insert the flow rate control needle into the Cleanert SLE-OD diatomaceous earth extraction column, load all the extraction solution onto the sample, wait for 15 minutes to allow sufficient time for the sample to adsorb onto the packing, repeat the washing of the sample in the reactor four times with 20 mL of ether, and then add it to the diatomaceous earth column for elution and collection of the eluent.

3. Concentration:

Place the round bottom flask containing ether extract collected above on a vacuum rotary evaporator and concentrate it to nearly 1 mL under low vacuum at around 35 ℃. Then, use a slow nitrogen flow to drive away the ether solution and concentrate it to near dryness.

4. Analysis:

gc-ms analysis