Voltammetric Determination of Zinc in Lubricating Oils

Ferreira, Heitor Breno Pereira; Barbeira, Paulo Jorge Sanches

doi:10.1021/ef900123y

Cited by 12 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As técnicas mais utilizadas para a determinação de metais em óleos lubrificantes são baseadas nas técnicas analíticas de espectrometria, como: espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES) [38,39,40,1], espectrometria de massa com plasma indutivamente acoplado (ICP-MS) [41,42], espectrometria de absorção atômica com chama (FAAS) [17,43,44] e espectrometria de absorção atômica com forno de grafite (GF AAS) ou com atomização eletrotérmica (ETAAS) [45,46]. Outras técnicas também foram utilizadas, como: voltametria de redissolução anódica [47,48], espectrometria de absorção atómica com chama de fonte contínua (HR-CS FAAS) [49], espectrometria de emissão atômica com filamento de tungstênio (WCAES) [50], espectrometria de emissão com plasma induzido por laser (LIBS) [37] e a fluorescência de Raios X (XRF) [51,52,53].…”

Section: Lubrificanteunclassified

Determinação de metais em óleo lubrificante empregando as técnicas ring oven e micro fluorescência de raios X

Cidade¹

View full text Add to dashboard Cite

Lubricating oil is used to reduce wear and friction of moving engine parts, thus essential for the performance and lifetime of the equipment increases. In automotive lubricants, there is often the presence of some ions of metallic elements and their occurrence in oil comes from two main sources of added additive or wear of engine parts. Increased amounts of some elements in the lubricating oil may indicate the extent of wear of engine components. Therefore, an elemental analysis of used lubricating oils may indicate the need for preventive maintenance of motors before irreversible damage occurs. The X-ray fluorescence technique dispersive energy (EDXRF) has the disadvantage of not having sufficient sensitivity for the determination of trace amounts of elements.To overcome this problem a pre-sample concentration step is necessary prior to analysis by EDXRF. Thus, this paper describes a method of pre-concentration for Ca, Cr, V, Fe, Ni and Zn in lubricating oil using the ring oven technique, and quantification of EDXRF. With the automation of ring oven technique it was possible to prepare rings using 250 µL of sample (2% w/w lubricating oil in toluene), 50 µL of toluene, and 500 µL carrier solution (30% v/v acetic acid in ethanol) added to the silica plate heated to 90 °C, with fixed volumes of 36 µL aliquots to the sample and 44 µL into toluene and the solution drag, with 30 seconds intervals. Recoveries for Cr, V and Fe are in the range of 92-118%, and the measured values of Ca and Zn to the SRM 1848 were 109% and 117%, respectively. The results of the determination to Ca and Zn in four new lube oil samples proved to be consistent with the values obtained by the reference method, mineralization / ICP OES. The pre-concentration procedure required only ten minutes while the ring formed measures required in total twenty-seven minutes. Furthermore, preconcentration of the ring oven system method presented repeatability and stability of rings for lubricating oil samples.

show abstract

Section: Lubrificanteunclassified

Determinação de metais em óleo lubrificante empregando as técnicas ring oven e micro fluorescência de raios X

Cidade¹

View full text Add to dashboard Cite

show abstract

Direct Determination of Copper in Biodiesel Using Stripping Analysis

et al. 2010

View full text Add to dashboard Cite

A simple, effective, and low-cost protocol for copper determination in biodiesel, with no sample decomposition, is reported. Samples were diluted in an ethanol-water solution (with HCl as supporting electrolyte) generating a homogeneous mixture at which copper was directly detected using stripping chronopotentiometry using a gold working-electrode. The optimized mixture was 100 mL (0.088 g) of biodiesel, 15 mL of ethanol, and 5 mL of 0.1 mol L À1HCl aqueous solution. The estimated detection limit was 200 ng g À1 (300-s deposition time). The elimination of the sample treatment step offers the possibility of on-site measurements in association with commercially-available portable potentiostats.

show abstract

Voltammetric Lead Determination in Aviation Fuel Samples Using a Screen‐Printed Gold Electrode and Batch‐Injection Analysis

2015

View full text Add to dashboard Cite

This work presents the lead determination in aviation (bio)fuels using disposable screen‐printed gold electrodes (SPGEs) adapted on a batch‐injection cell associated with a micropipette for portable analysis. The method involves injections of 200 µL of sample or standard solutions at controlled dispensing rate (4.8 µL s−1) during deposition step (−550 mV for 90 s), followed by anodic‐stripping voltammetry. Either samples treated by sonication or dry‐ashing can be analyzed with detection limits of 0.0071 and 0.0008 µg g−1 Pb, respectively. A single SPGE can be applied for 60 consecutive measurements (or 120 for samples dry‐ashed). The ultrasound‐assisted treatment is faster, safer, and easily adapted for on‐site analyses, especially considering the portable characteristics of commercially‐available potentiostats and batch‐injection analysis cell using SPGEs.

show abstract

Voltammetric Determination of Zinc in Lubricating Oils

Cited by 12 publications

References 39 publications

Determinação de metais em óleo lubrificante empregando as técnicas ring oven e micro fluorescência de raios X

Determinação de metais em óleo lubrificante empregando as técnicas ring oven e micro fluorescência de raios X

Direct Determination of Copper in Biodiesel Using Stripping Analysis

Voltammetric Lead Determination in Aviation Fuel Samples Using a Screen‐Printed Gold Electrode and Batch‐Injection Analysis

Contact Info

Product

Resources

About