https://commons.ru.ac.za/vital/access/manager/Index en-us 5 A study of electrospun nanofibers and diatomaceous earth materials for the extraction of alkaloids, flavonoids and aromatic amines in various matrices https://commons.ru.ac.za/vital/access/manager/Repository/vital:4288 Wed 12 May 2021 23:05:00 SAST ]]> Profiling for volatile compounds in the Kgalagadi desert truffle https://commons.ru.ac.za/vital/access/manager/Repository/vital:4280 Wed 12 May 2021 19:10:00 SAST ]]> An ion imprinted polymer for the determination of Ni (II) ions from mine tailing samples https://commons.ru.ac.za/vital/access/manager/Repository/vital:4323 Wed 12 May 2021 18:24:41 SAST ]]> Electrospun sorbents for solid phase extraction (SPE) and colorimetric detection of pesticides https://commons.ru.ac.za/vital/access/manager/Repository/vital:4501 0. 96), demonstrating the fiber affinity to retain both polar and non-polar compounds opening a possibility to be used as sorbent for sample preparation of different classes of pesticides in water. For the second part of the study simple strategies for colorimetric sensing based on silver nanoparticles and polivinylpyrrolidone capped nanoparticles were developed, respectively for atrazine and chlorpyrifos detection. The limits of detection of the methods were 3.32 and 0.88 mg/L for atrazine and chlorpyrifos respectively. The applicability of the probe in real samples was demonstrated by the recoveries studies of tap water varying from 94 to 104 percent. The versatility of the probe was demonstrated by affording a simple, rapid and selective detection of atrazine and chlorpyrifos in the presence of other pesticides by direct analysis without employing any sample handling steps. Attempt to incorporate the probes in a solid support was achieved by using nylon 6 as solid support polymer proving to be fast and useful for on-site detection.]]> Wed 12 May 2021 17:40:49 SAST ]]> Assessment of organochlorine pesticide residues in fish samples from the Okavango Delta, Botswana https://commons.ru.ac.za/vital/access/manager/Repository/vital:4404 Wed 12 May 2021 16:23:00 SAST ]]>