Multielemental analysis of vegetable oils and fats by means of ICP-OES following a dilution and shot methodology

Abstract

The accurate direct elemental analysis of fats and oils is accomplished according to a dilution and shot analysis method.

Olive Oil Traceability Studies Using Inorganic and Isotopic Signatures: A Review

“…Olive oil is a high-viscosity lipid matrix. Its viscosity makes analysis with spectrometric instruments challenging [ 53 ]. Due to the critically low concentrations of some elements in olive oil, the latest studies tended to promote the use of ICP-MS known for its high sensitivity.…”

“…( Figure 4 ). They are often designed to obtain a final solution that can be rapidly and easily analysed using various spectrometric instruments [ 53 , 58 ].…”

“…Methods involving dilution with organic solvents for olive oil studies [ 53 , 70 ] have the main advantage of being based on the direct analysis of diluted oily matrices (with an adjusted sample introduction system). Recently, a high-temperature torch integrated sample introduction system (hTISIS) was applied for the analysis of oils and fats after dilution with xylene by ICP-OES [ 53 ]. The addition of oxygen as an auxiliary gas in ICP-OES was also investigated for that purpose [ 75 ].…”

Inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) for the analysis of fuels, biofuels and their feedstock using a high temperature total consumption sample introduction system operated under continuous sample aspiration mode

“…These results were in agreement with those previously shown for other complex matrices. 23 Moreover, the impact of the temperature on sensitivity was also evaluated. It was observed that the sensitivity increased with the hTISIS temperature, peaking at 300-400 C. Above these temperatures, a drop in sensitivity was observed.…”

“…Therefore, a universal calibration procedure can be implemented in which external calibration with a set of xylene-based standards can be used for the analysis of all kind of organic samples. 23 However, the increase in the spray chamber wall temperature leads to an increase in the amount of solvent reaching the plasma, thus causing plasma degradation or soot deposits. A possible solution to lower the amount of solvent delivered to the plasma is to introduce the sample according to an airsegmented injection procedure, thus obtaining transient signals.…”