Surface-layer carbon-polytetrafluoroethylene sorbents in the preconcentration of phenolic compounds from aqueos solutions
Abstract
The actual task of analytical chemistry is to develop a rapid, reliable and economically viable methods
for the determination of anthropogenic contaminants in various environmental objects. At the same
time from year to year, the maximum allowable concentration of harmful substances is reduced due to the
growth of industrial production and development of hardware design analysis.
A massive group of contaminants present phenols present in water bodies in trace amounts. The
most common and effective method for preconcentrating phenols in the analysis of aqueous solutions is a
dynamic sorption, and the most popular sorbents – activated carbon of different brands. But when they are
used to face various problems, such as incomplete desorption of the analyte. Therefore, this work focused on
optimization of the process of the preconcentration of phenols.
For the preconcentration of phenols it is recommended to use stainless steel column dimensions
(length x internal diameter) 50 x 3 mm, filled in surface-layer carbon-PTFE sorbent based on activated carbon
brand of the FAS – 25% of FAS (fraction <0.056 mm) on PTFE (fraction 0.25-0.3 mm). The use of these
sorbents allows for high speeds of water samples (5 sm3
/min) to quantitatively extract the phenol and the
isomeric cresols. The achievable ratio of the preconcentration of least retained phenol – 200. Quantification
is recommended that a liquid chromatograph with fluorimetric detector. The conditions of HPLC analysis:
the chromatographic column is Supelco Discovery C18 dimensions (length x internal diameter) 250 x 4.6
mm filled with 5 µm; excitation wavelength is 215 nm; the emission wavelength is 300 nm; column temperature
is 30 0 C; sample volume – 20 µl; the mobile phase composition is acetonitrile : water; elution mode –
gradient. Thanks to the found optimum conditions it is possible to determine phenol and the isomeric cresols
at the level of maximum permissible concentrations, using commercially available materials and the most
common analytical equipment.
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