Method and uses for using 2-amino-4-nitrophenol for identifying SDS in water solution under naked eye

Abstract

The invention provides a method that a compound 2-amino 4-nitrophenol recognizes with selectivity and naked-eyes anionic surface surfactant-sodium dodecylbenzene sulfonate in water solution. An acceptor molecule 2-amino-4-nitrophenol has color developing effects of high selectivity and naked-eyes identifications to the sodium dodecylbenzene sulfonate in an aqueous phase, thereby the compound 2-amino-4-nitrophenol can be used for water quality tests which comprises following steps: formulating the compound 2-amino-4-nitrophenol into the water solution whose concentration is 8*10-4mol / L-2*10-3mol / L as acceptor solution, adding testing water body whose volume is 2-4 times bigger than acceptor solution volume, diluting the acceptor solution until the acceptor solution volume is 8-10 times bigger than original acceptor solution volume with distilled water, placing mixed liquid for a night, and observing solution color changes in color comparison tubes. The sodium dodecylbenzene sulfonate is over-standard if solution color changes from yellow to orange and the dodecylbenzene sulfonic acid sodium isn't over-standard if the solution color has no clear changes.

Description

technical field [0001] The present invention relates to a method for recognizing anions by acceptor molecules, in particular to a kind of anionic surfactant that uses acceptor 2-amino-4-nitrophenol as acceptor and selectively recognizes with naked eyes in water-solubility—— Sodium dialkylbenzene sulfonate method. Background technique [0002] Surfactant is a new type of chemical that emerged with the rapid development of the petrochemical industry in the 1950s. At present, most of the surfactants produced in China are anionic surfactants, mainly sodium linear alkylbenzene sulfonate (LAS). LAS enters the environment through sewage, domestic garbage and industrial waste, causing water foaming, toxicity, reducing the rate and degree of reoxygenation in water, deteriorating water quality, affecting the survival of aquatic organisms, and hindering the self-purification of water. Therefore, the monitoring problem of anionic surfactants cannot be ignored, and the search for acce...

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Problems solved by technology

Unfortunately, at present, most acceptor molecules can only recognize anions in anhydrous conditions and in aprotic solvents, which greatly limits the application range of anion recognition research.

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