Alkylphenol monoethoxylate

Nonionic surfactants like alkylphenol ethoxylates (APEO) and their biodegradation products alkylphenol diethoxylate (AP2EO), alkylphenol monoethoxylate (APIEO), and AP are isolated from aqueous solutions with a number of different stationary phases. Kubeck et al. ° used C18 cartridges to adsorb NPEO, but first the water samples were passed through a mixed-bed ion exchange resin to remove all ionic species. Eor SPE of alcohol ethoxylates (AEO) C8 cartridges have been successfully applied from which the surfactants were eluted with methanol followed by... 

Because of the formation of emulsions at phase boundaries for APE surfactants, EEE is limited to the degradation products APs, alkylphenol monoethoxylate to triethoxylate (APE(l-3)) and alkylphenol ethoxy carboxylate (APEC). Dichloromethane and hexane are the solvents commonly used in the extraction of APs and APE(l-3) from liquid samples.For phenolic compounds including BPA, OP, and NP, water samples are often acidified to pH < 4 with hydrochloric acid. Acidification of water samples suppresses the dissociation of phenols and prevents the ionization of the analytes, which increased the efficiency of the extraction. Del Olmo et al. " studied the effect of pH on extraction of BPA using sodium hydroxide and hydrochloric acid for adjustment. The result obtained showed that the extraction efficiency remains constant for pH values lower than 6.5, decreasing sharply for higher values. This behavior agrees with the weak acid nature of BPA. 

For the quantification of alkylphenol ethoxylates (APEOs), several related compounds have been used as internal standard, e.g. for recovery determination, decylphenol monoethoxylate [20]. Octylphenol nonaethoxylate (t-0PE09) was synthesised by reacting octylphenol (OP) with 1,2-6j.s(2-chloroethoxy)ethane to give the chloro derivative, followed by reaction with the sodium salt of hexaethylene glycol [21,22], Another approach used the synthetic standard l-(4,-methoxyphenyl)-hexan-l-ol as a surrogate to monitor the efficiency of the extraction for... 

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