I have done research and apparently both C18 and HLB have good recoveries concerning phthalates.
Has any of the RG colleagues already used any of these two cartridges for phthalates concentration in stormwater samples?
According to US EPA method, C18 is used to determine the identities and concentrations of various phthalate esters in aqueous and solid matrices including groundwater, they have used C18 at pH 5-7 and using acetonitrile as eluting solvent.
I have extracted PAHs using C18, while I have identified various phthalates in my extracted samples.
Regards.
It would be very helpful to me if you can provide me with the reference of the US EPA method.
because i just found the liquid liquid extraction technique but not the SPE with C18.
Regards.
Dear Racha EL-OSMANI
Disks and Cartridges with C18 can be used but attention is required for pH adjustment. However variation of recovery is vary for SPE methods. I have used this for pesticide residue analysis.
Bonded-phase silica (e.g., C18) will hydrolyze on prolonged exposure to aqueous
samples with pH levels of less than 2 or greater than 9. Hydrolysis will increase at the extremes of this pH range and with longer contact times. Hydrolysis may reduce extraction efficiency or cause baseline irregularities. Styrene divinylbenzene (SDB) extraction disks should be considered when hydrolysis is a problem (from METHOD 3535A)
SPE methods for Phthalate esters (METHOD 3535A,8061A
rgards
Piyal
Dear Racha EL-OSMANI , Mr. Piyal did that, please find the attached file. Thanks.
Dear A. G. Piyal Aravinna and Md. SAddam Nawaz,
Thank you for your useful information
Best regards
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