Journal
SOUTH AFRICAN JOURNAL OF CHEMISTRY-SUID-AFRIKAANSE TYDSKRIF VIR CHEMIE
Volume 70, Issue -, Pages 145-153Publisher
BUREAU SCIENTIFIC PUBL
DOI: 10.17159/0379-4350/2017/v70a21
Keywords
Molecularly imprinted polymer; pharmaceuticals; water resources; solid-phase extraction
Categories
Funding
- National Research Foundation (NRF) of South Africa [93986]
- Eskom through Tertiary Education Support Program
- NRF
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In this study, the extraction of naproxen, ibuprofen and diclofenac from Ladysmith water resources was conducted by means of a multi-template molecularly imprinted polymer (MIP) as selective sorbent in solid-phase extraction. Quantification was done using high performance liquid chromatography with photo diode array detection system. Bulk polymerization of MIP was carried out at 70 degrees C for 24 h and characterized with differential scanning calorimetry, X-ray diffraction and zeta potential. The analytical method detection limits for naproxen, ibuprofen and diclofenac in wastewater treatment plant effluent were 0.23, 1.02 and 0.30 mu g L-1, respectively. Recoveries obtained in wastewater, river water, deionized water and drinking water treatment plant (DWTP) samples spiked with 5 mu g L-1 of target compounds and pre-concentrated using molecularly imprinted solid-phase extraction (MISPE) were greater than 80 %. All compounds were not detected in DWTP samples, whereas in river water the concentrations were generally higher in the upstream of wastewater treatment plants compared to downstream. The maximum concentrations detected in river water for naproxen, ibuprofen and diclofenac were 2.77, 6.72 and 2.58 mu g L-1, respectively. Only diclofenac was present in wastewater at concentrations above the limit of quantification. In conclusion, the high levels of naproxen, ibuprofen and diclofenac detected in river water could be attributed to poor sanitation in Ladysmith.
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