Piotr Jamroz | Wrocław University of Technology (original) (raw)

Papers by Piotr Jamroz

Analytical chemistry, Jan 6, 2017

A novel liquid drop anode (LDA) direct current atmospheric pressure glow discharge (dc-APGD) syst... more A novel liquid drop anode (LDA) direct current atmospheric pressure glow discharge (dc-APGD) system was applied for direct determination of Cd in liquid microsamples (50 μL) by optical emission spectrometry (OES). The microdischarge was generated in open-to-air atmosphere between a solid pin type tungsten cathode and a liquid drop placed on a graphite disk anode. The arrangement of the graphite disk placed on a PTFE chip platform as well as the solid pin type cathode was simple and robust. The limit of detection (LOD) of Cd for the developed LDA-APGD-OES method was 0.20-0.40 μg L(-1), while precision (as the relative standard deviation for the repeated measurements) was within 2-5%. By using the liquid drop of 50 μL, the linearity range of 1-1000 μg L(-1) was achieved. The effect of addition of the low-molecular weight (LMW) organic compounds, easily ionized elements (EIEs), i.e., Ca, K, Mg, and Na, as well as the foreign ions (Al, Cu, Fe, Mn, Zn) to the solution on the in situ atom...

Analytical Chemistry, 2016

A novel atmospheric pressure glow discharge generated in contact with a flowing liquid anode (FLA... more A novel atmospheric pressure glow discharge generated in contact with a flowing liquid anode (FLA-APGD) was developed as the efficient excitation source for the optical emission spectrometry (OES) detection. Differences in the appearance and the electrical characteristic of the FLA-APGD and a conventional system operated with a flowing liquid cathode (FLC-APGD) were studied in detail and discussed. Under the optimal operating conditions for the FLA-APGD, the emission from the analytes (Ag, Cd, Hg, Pb, Tl, and Zn) was from 20 to 120 times higher as compared to the FLC-APGD. Limits of detections (LODs) established with a novel FLA-APGD system were on average 20 times better than those obtained for the FLC-APGD. A further improvement of the LODs was achieved by reducing the background shift interferences and, as a result, the LODs for Ag, Cd, Hg, Pb, Tl, and Zn were 0.004, 0.040, 0.70, 1.7, 0.035, and 0.45 μg L(-1), respectively. The precision of the FLA-APGD-OES method was evaluated to be within 2-5% (as the relative standard deviation of the repeated measurements). The method found its application in the determination of the content of Ag, Cd, Hg, Pb, Tl, and Zn in a certified reference material (CRM) of Lobster hepatopancreas (TORT-2), four brass samples as well as mineral water and tea leaves samples spiked with the analytes. In the case of brass samples, a reference method, i.e., inductively coupled plasma optical emission spectrometry (ICP-OES) was used. A good agreement between the results obtained with FLA-APGD-OES and the certified values for the CRM TORT-2 as well as the reference values obtained with ICP-OES for the brass samples was revealed, indicating the good accuracy of the proposed method. The recoveries obtained for the spiked samples of mineral water and tea leaves were within the range of 97.5-102%.

Spectrochimica Acta Part B: Atomic Spectroscopy, 2016

Journal of Pharmaceutical and Biomedical Analysis, 2016

Elemental analysis of herbal teas and their tisanes is aimed at assessing their quality and safet... more Elemental analysis of herbal teas and their tisanes is aimed at assessing their quality and safety in reference to specific food safety regulations and evaluating their nutritional value. This survey is dedicated to atomic spectroscopy and mass spectrometry element detection methods and sample preparation procedures used in elemental analysis of herbal teas and medicinal plant formulations. Referring to original works from the last 15 years, particular attention has been paid to tisane preparation, sample matrix decomposition, calibration and quality assurance of results in elemental analysis of herbal teas by different atomic and mass spectrometry methods. In addition, possible sources of elements in herbal teas and medicinal plant formulations have been discussed.

Postepy Mikrobiologii

Sterylizacja, nazywana również wyjaławianiem, jest metodą niszczenia wszystkich form mikroorganiz... more Sterylizacja, nazywana również wyjaławianiem, jest metodą niszczenia wszystkich form mikroorganizmów, zarówno wegetatywnych, jak i przetrwalnych. Istnieje wiele tradycyjnych sposobów sterylizacji: wilgotnym ciepłem , suchym gorącym powietrzem [2], parą wodną pod ciśnieniem w autoklawie [4], z użyciem formaldehydu [17] czy tlenku etylenu . Metody te opierają się na inaktywacji mikroorganizmów w wyniku spowolnienia ich metabolizmu bądź zniszczenia ich materiału genetycznego .

The stable atmospheric pressure glow discharges (APGDs) were generated in contact with a flowing ... more The stable atmospheric pressure glow discharges (APGDs) were generated in contact with a flowing liquid cathode. As an anode, a gaseous argon and helium microjets or a metallic electrode were applied. All discharges were operated in the ambient air atmosphere at a supplied power lower than 40 W. The different atomic and molecular species were excited in the core of these discharges. The emission spectra of the investigated APGDs were dominated by the bands of the OH, N 2 , NO, and NH molecules. In addition, the atomic O I and H and ionic O II emission lines were identified. The mechanisms of the processes occurred in the interfacial discharge-liquid zones as well as in the liquid phases and responsible for the production of the reactive species were discussed. The production of H 2 O 2 , NO 3 -, NO 2 as well as the OH radicals in the liquid phase and the fall of the solution pH was confirmed.

J. Anal. At. Spectrom., 2015

Przemysl Chemiczny

Dokonano przeglądu literatury z zakresu stałoprądowego wyładowania jarzeniowego małej mocy genero... more Dokonano przeglądu literatury z zakresu stałoprądowego wyładowania jarzeniowego małej mocy generowanego pod ciśnieniem atmosferycznym w kontakcie z ciekłą katodą, które jest stosowane i badane od ostatnich kilkunastu lat. Poruszane zagadnienia zwią-zane są zarówno z naturą samego zjawiska, jak również wpływem różnych czynników zewnętrznych na morfologię widma emisyj-nego tego wyładowania. Ponieważ wyłado-wanie może w przyszłości stanowić cenne źródło wzbudzenia stosowane w analitycznej spektrometrii atomowej, szczególny nacisk położono na omówienie jego charakterysty-ki analitycznej oraz zastosowanie w analizie pierwiastkowej różnego rodzaju próbek śro-dowiskowych. Wyładowanie jarzeniow pod ciśnieniem atmosferycznym w kontakcie z cieczą jako nowe źródło wzbudzenia w optycznej spektrometrii emisyjnej Atmospheric pressure glow discharge in a contact with liquid as a new excitation source in optical emission spectrometry Dr inż. Piotr JAMRÓZ w roku 1998 ukończył studia na Wydziale Chem...

de la Guardia/Handbook of Mineral Elements in Food, 2015

Journal of Nanoparticle Research, 2015

Gold nanoparticles (Au NPs) were prepared by direct current atmospheric pressure glow microdischa... more Gold nanoparticles (Au NPs) were prepared by direct current atmospheric pressure glow microdischarge (dc-lAPGD) generated between a miniature argon flow microjet and a flowing liquid cathode. The applied discharge system was operated in a continuous flow liquid mode. The influence of various stabilizers added to the solution of the liquid cathode, i.e., gelatin (GEL), polyvinylpyrrolidone (PVP), or polyvinyl alcohol (PVA), as well as the concentration of the Au precursor (chloroauric acid, HAuCl 4 ) in the solution on the production growth of Au NPs was investigated. Changes in the intensity of the localized surface plasmon resonance (LSPR) band in UV/Vis absorption spectra of solutions treated by dc-lAPGD and their color were observed. The position and the intensity of the LSPR band indicated that relatively small nanoparticles were formed in solutions containing GEL as a capping agent. In these conditions, the maximum of the absorption LSPR band was at 531, 534, and 535 nm, respectively, for 50, 100, and 200 mg L -1 of Au. Additionally, scanning electron microscopy (SEM) and dynamic light scattering (DLS) were used to analyze the structure and the morphology of obtained Au NPs. The shape of Au NPs was spherical and uniform. Their mean size was ca. 27, 73, and 92 nm, while the polydispersity index was 0.296, 0.348, and 0.456 for Au present in the solution of the flowing liquid cathode at a concentration of 50, 100, and 200 mg L -1 , respectively. The production rate of synthesized Au NPs depended on the precursor concentration with mean values of 2.9, 3.5, and 5.7 mg h -1 , respectively.

The discharge generated between solid electrode and water (working as cathode) was investigated b... more The discharge generated between solid electrode and water (working as cathode) was investigated by optical emission spectroscopy. The spectral characteristics of the discharge was examined. High energy species were indentified in plasma. The emission intensities of main species were measured versus various experimental parameters. The rotational, vibrational and excitation temperatures were determined and compared for the selected experimental parameters. Additionally, the ion to atom ratio and the electron number density were measured. Plasma processes and plasma non-equilibrium phenomena were discussed. The analytical performance of the plasma source was investigated for selected metals (Zn and Cu) dissolved in water.

Direct-current, atmospheric-pressure, glow discharge (dc-APGD) generated in contact with flowing ... more Direct-current, atmospheric-pressure, glow discharge (dc-APGD) generated in contact with flowing sample solutions is a new, very promising excitation source for analytical optical emission spectrometry, due to its low maintenance requirements and its analytical performance. Since analyzed solutions act as liquid cathodes, this discharge system is useful for the direct determination of elements dissolved in solutions without having to produce their aerosols by pneumatic nebulization.

The optical emission spectroscopy was applied to investigate the middle frequency (100 kHz) and d... more The optical emission spectroscopy was applied to investigate the middle frequency (100 kHz) and dc low pressure discharges, generated in the nitrogen-acetylene-argon and nitrogen-acetylene-helium mixtures, commonly used for deposits of carbon nitride thin layers. Changes in the emission intensities of the selected species: CN, CH, C, H, N 2 , N 2 þ as well as Ar, Ar þ and He, were studied as a function of the discharge current. Excitation processes occurring in the presence of argon and helium were compared and discussed. The N 2 -C 2 H 2 -Ar and N 2 -C 2 H 2 -He plasmas generated in the 100 kHz and dc glow discharges were characterized by the excitation (Ar, He, H), vibrational (CN, N 2 ) and rotational (CN, N 2 þ ) temperatures. A significant deviation from the equilibrium state was observed for the plasma containing argon as well as helium.