In the present work we propose the use of headspace-mass spectrometry (HS-MS) for the characterisation of monovarietal olive oils, an issue of interest when the origin of an oil has to be determined. The HS-MS procedure involves the direct introduction of the sample into a vial, headspace generation and automatic injection of the volatiles into a mass spectrometer. The results were compared with those obtained using more conventional approaches, including chromatographic, spectrophotometric and other types of analysis. Linear Discriminant Analysis (LDA) was applied to the data obtained with both analytical methodologies to achieve the differentiation of the three types of samples. The proposed method is faster and cheaper than those usually employed for edible oil analysis and no sample preparation is required. Additionally, the measuring process is simple and the results obtained from chemometric treatment are 100% correct as regards classification and prediction, making it an appropriate method for routine control.
In this study, an electrochemical method was developed using flow injection analysis and amperometric detection with screen-printed electrodes for iodide determination as a tracer in seawater reservoirs. The amperometric method resulted in a good linear correlation coefficient (r = 0.9966) with a linear response over a concentration range of 1-10 mg L -1 , a limit of detection of 0.2 mg L -1 and a quantification of 0.6 mg L -1 . In addition, the method has been shown to be precise, linear and homoscedastic. The recovery for the amperometric method was 100 ± 3 %, and the recovery for the produced water samples fortified with iodide was 102 ± 2 %. The amperometric method did not show interference from other anions. Thus, the proposed method is promising for analysing the iodide content of seawater reservoir samples with simple and inexpensive methodologies compared with ion chromatography techniques.
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