Clinical and biological materials, foods and beverages

Taylor, Andrew; Branch, Simon; Halls, David J.; Owen, Linda; White, Mark D.

doi:10.1039/a900785g

Cited by 18 publications

(4 citation statements)

References 40 publications

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“…Normally, it is necessary to decompose the wine because of possible matrix interferences [9,15]. This can be done by wet digestion on a hot plate or in a microwave oven using concentrated HNO 3 [28], a mixture of concentrated HNO 3 and 30% H 2 O 2 [19,20,26], 30% H 2 O 2 [25] or 30% H 2 O 2 followed by adding concentrated H 2 SO 4 [31,32] or HNO 3 [28,34]. Ca, K, Mg and Na are usually measured only after dilution of original samples with water [16,29].…”

Section: Introductionmentioning

confidence: 99%

<b>Concentration levels of essential and non-essential elements in selected Ethiopian wines</b>

Woldemariam

Chandravanshi

2011

Bull. Chem. Soc. Eth.

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and Cr) were determined in four brands of Ethiopian wines by flame atomic absorption spectrometer (FAAS) after digesting the wine samples with HNO3-H2O2 mixture. Among the major metals potassium (694-767 mg/L) was found to be at the highest level, followed by magnesium (58.1-79.2 mg/L), calcium (28.4-37.1mg/L) and sodium (24.0-24.4 mg/L). From the minor metals iron, zinc and manganese were in the ranges of 1.42-3.16, 1.82-2.70, and 1.04-1.88 mg/L, respectively, followed by copper (0.5-1.5 mg/L), nickel (0.18-0.20 mg/L), cobalt (<0.065-0.091 mg/L) and chromium (<0.075-0.192 mg/L). The toxic metal lead was in the range of 0.14-0.31 mg/L while cadmium was below detection limit of the analytical procedure used in this study (<0.01 mg/L). The levels of metals in the Ethiopian wines were found to be comparable with wines of some other countries.

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Section: Introductionmentioning

confidence: 99%

<b>Concentration levels of essential and non-essential elements in selected Ethiopian wines</b>

Woldemariam

Chandravanshi

2011

Bull. Chem. Soc. Eth.

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“…Although the skeptic might opine that the new method has no obvious application in the real world and that the authors simply analyzed the RMs to ensure that the paper was published, this type of work represents an important, and one of the more visual, uses for CRMs; see, for example, the annual reviews of analytica1 developments in atomic spectroscopy (Cave et al 1999;Fairman et al 1999;Taylor et al 1999). Although the skeptic might opine that the new method has no obvious application in the real world and that the authors simply analyzed the RMs to ensure that the paper was published, this type of work represents an important, and one of the more visual, uses for CRMs; see, for example, the annual reviews of analytica1 developments in atomic spectroscopy (Cave et al 1999;Fairman et al 1999;Taylor et al 1999).…”

Section: Characterization Of Methodsmentioning

confidence: 99%

Particular Developments

Stoeppler¹

2000

References Materials for Chemical Analysis

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IntroductionThis Chapter is concerned with quality and chemical analysis. While it can be shown that the required quality as expressed in terms of sensitivity, speed of analysis etc. is, to some extent, dependent on the particular application for which the analysis is used, in all situations these factors need to be known and features such as accuracy and precision should be as good as can be achieved. Thus, how can the quality of an analysis be measured, how can good quality be achieved, and how can good quality be maintained?Reference materials play an essential role in answering those aspects of these quality issues that relate particularly to accuracy and precision although they are also relevant to related concepts such as traceability, trueness and uncertainty ( I S 0 1993, Kristiansen and Christensen 1998). In the use of reference materials (RMs) for these purposes, a clear distinction is made between certified and non-certified reference materials. Highly characterized certified (or standard) reference materials (CRMs, SRMs), with analyte concentrations carefully defined using techniques which afford the very best accuracy, in laboratories with experience and expertise in this type of work, are extremely valuable items. They are also extremely costly. Much of the work to be described here is achieved with well prepared, stable, homogeneous materials where the analyte concentrations are unknown or are given by less rigorous protocols, and are not claimed to be certified. Nevertheless, as shown below, for those applications where such materials are readily available, either from commercial suppliers or as home-produced reagents, they have equally important €unctions when looking at analyhcal quality.A further distinction is made between pure solutions and matrix-based RMs. The former are available for many organic and inorganic analytes, with certified concentrations, but their role in quality control and assessment is limited. They may be used for the preparation of calibration solutions for a particular measurement but more usually these materials represent the base for traceability, through secondary

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“…Many similar methods followed, the main differences being in the use of alternative platinum group modifiers. An interesting development reported in the 1996, 84 1997 85 and 1999 72 Updates was the low-cost portable instrument using tungsten coil atomisers, for the mass screening of children for lead exposure in the US.…”

Section: Leadmentioning

confidence: 99%

“…128 Continued development of MS instruments has maintained their dominant position in many applications. The 1999 ASU 129 notes ''that more laboratories now have double focusing magnetic sector ICP-MS.'' Other relevant developments have included coupling of ETV and LA to ICP-MS, which has lead to further interest in solid analysis, and collision cells for reducing polyatomic interferences. The sensitivity and selectivity of MS techniques has accelerated the demise of others and in recent years, reports featuring DCP, MIP, NAA and SIMS are virtually non-existent.…”

Section: Progress With Analytical Techniquesmentioning

confidence: 99%