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21.
The comparison of anthocyanin and pyranoanthocyanin extraction efficiency in Pinot Noir wine using SPE
Branka Mozetič Vodopivec, Dorota Korte, Jelena Topić, 2017, published scientific conference contribution abstract

Found in: osebi
Keywords: Anthocyanins, wine, Pinot Noir, HPLC, solid-phase extraction
Published: 05.07.2017; Views: 1131; Downloads: 0
.pdf Fulltext (109,24 KB)

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DETERMINATION OF Fe2+ IN LIQUID SAMPLES BY THE USE OF AMPLIEFIED THERMAL LENS SPECTROMETRY
Humberto Cabrera, Dorota Korte, Leja Goljat, Mladen Franko, 2017, published scientific conference contribution abstract

Found in: osebi
Keywords: AMPLIEFIED THERMAL LENS SPECTROMETRY, Fe2+
Published: 30.08.2017; Views: 1218; Downloads: 0
.pdf Fulltext (12,87 MB)

25.
Trace Detection and Photothermal Spectral Characterization by a Tuneable Thermal Lens Spectrometer with White-Light Excitation
Mladen Franko, Dorota Korte, Humberto Cabrera, 2018, original scientific article

Abstract: In the thermal lens experimental set-up we replaced the commonly employed pump laser by a halogen lamp, combined with an interference lter, providing a tuneable, nearly monochromatic pump source over the range of wavelengths 430–710 nm. Counter-propagating pump and probe beams are used and a 1 mm path-length sam- ple cell together with the interference lter makes an optical cavity, providing ampli cation of the thermal lens signal, which leads to enhancement of the measurement sensitivity, and enables detection of absorbances on the order of 5×10− 6. Ampli ed thermal lens signal allows us to replace the typical lock-in ampli er and digital os- cilloscope with a silicon photodetector, Arduino board, and a personal computer, offering the possibility for a compact, robust and portable device, useful for in- eld absorption measurements in low concentration or weakly absorbing species. The use of a white light source for optical pumping, an interference lter for wavelength selection and direct diagnostic of the thermal lens signal increase the versatility of the instrument and simpli- es substantially the experimental setup. Determination of Fe(II) concentrations at parts per billion levels was performed by the described white-light thermal lens spectrophotometer and the absorption spectrum for 50μg/ L Fe(II)-1,10-phenanthroline was well reproduced with an average measurement precision of 4%. The obtained limits of detection and quantitation of Fe(II) determination at 510nm are 3μgL− 1 and 11μgL− 1, respectively. The calibration curve was linear in the concentration range of LOQ-500μgL− 1 with reproducibility between 2% and 6%, con rming that this instrument provides good spectrometric capabilities such as high sensitivity, tune- ability and good reproducibility. In addition, the versatility of the instrument was demonstrated by recording the photothermal spectrum of gold nanostructured material and determination of excitation wavelength with most ef cient optical to thermal energy conversion, which differs considerably (cca 100 nm) from the absorption maximum of the investigated sample.
Found in: osebi
Keywords: thermal lens spectrometry, Fe(II) determination, photothermal technique, multi-wavelength excitation
Published: 21.02.2018; Views: 846; Downloads: 0
.pdf Fulltext (889,82 KB)

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TLS-FIA System For Screening of Dissolved Iron in Ocean Water
Gaja Tomsič, Dorota Korte, Arne Bratkič, Mladen Franko, 2018, published scientific conference contribution abstract

Found in: osebi
Keywords: flow injection analysis, iron concentration, ocean water, thermal lens spectroscopy
Published: 16.07.2018; Views: 866; Downloads: 0
.pdf Fulltext (679,78 KB)

30.
Determination of iron species in Arctic water by optimized photothermal beam deflection spectroscopy
Hanna Budasheva, Dorota Korte, Arne Bratkič, Mladen Franko, 2018, published scientific conference contribution abstract

Found in: osebi
Keywords: phototermal beam deflection spectroscopy, arctic water, iron species
Published: 16.07.2018; Views: 784; Downloads: 0
.pdf Fulltext (777,92 KB)

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