11 апр. 2023 г. · If you have access to anhydrous ammonia I would suggest preparing ammonia-saturated methanol (bubble ammonia through methanol). Use this as ...

The technique is based on normal phase ion-pair chromatography. The separation of a number of quaternary ammonium and pyridinium compounds is demonstrated.

Ion chromatography is ideal for testing ammonia and the ammonium cation (NH4) contaminants in drinking water, some pharmaceuticals, and even aqueous soils.

4 нояб. 2014 г. · Because the ammonia or ammonium hydroxide is generally added to the polar solvent (methanol usually), pack your column with 1-2% of the polar ...

Solvent systems containing ammonia can be useful in this context: prepare a stock solution of 10% ammonium hydroxide in methanol, and try using 1-10% of ...

Ion chromatography is ideal for testing ammonia and the ammonium cation (NH4) contaminants in drinking water, some pharmaceuticals, and even aqueous soils.

This post discusses the challenges of purifying organic amines and some suggested alternative chromatography techniques.

The ammonia peak (100 ppm to 20%) has excellent retention time and area repeatability. The whole system is inert against the corrosion of ammonia with moisture.

Flash column chromatography is usually carried out with a mixture of two solvents, with a polar and a nonpolar component. Occasionally, just one solvent can be ...

Determination of ammonia and aliphatic amines in environmental aqueous samples utilizing pre-column derivatization to their phenylthioureas and high performance ...