Calibration of solid sampling Zeeman atomic absorption spectrophotometry by extrapolation to zero matrix

Pauwels, J.; Hofmann, C; Vandecasteele, Carlo

doi:10.1007/bf00325303

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…We have seen such results during direct determination of Mn in vitamin-mineral tablets by using solid sampling [12]. Different explanations were made for the overestimated results obtained from small sample masses, which include condensation of volatile elements on particle surfaces [13], inaccurate background correction [14] and water content in the sample. In this case not only the analyte concentration but also the amount of solid sample is a critical parameter to work in the linear range.…”

Section: Solid Samplingmentioning

confidence: 89%

Direct determination of phosphorus in different food samples by means of solid sampling electrothermal atomic absorption spectrometry using Pd+Ca chemical modifier

Coşkun

Akman

2005

Spectrochimica Acta Part B: Atomic Spectroscopy

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Section: Solid Samplingmentioning

confidence: 89%

Direct determination of phosphorus in different food samples by means of solid sampling electrothermal atomic absorption spectrometry using Pd+Ca chemical modifier

Coşkun

Akman

2005

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…The sampling variance of the material determined at a certain mass and the number of repetitive analyses can be used for the calculation of a sampling constant, K,, a homogeneity factor, HE, or a statistical tolerance interval (m * A) which will cover at least a 95 % probability at a probability level of Ia = 0.95 to obtain the expected result in the certified range (Pauwels et al 1994). The value of A is computed as A = P2 R, , a multiple of R,, where R, is the standard deviation of the homogeneity determination,.…”

Section: Aspects Of Homogeneity Determinationmentioning

confidence: 99%

“…A minimum sample mass to achieve 5% precision on a 95% confidence level is derived from Equation (4.7) (Pauwels et al 1994) using a factor V 2 for two-sided tolerance limits of normal distributions as given in standard statistical textbooks.…”

Section: Homogeneity Determinations With Solid Sampling Atomic Absorpmentioning

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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“…A frequently cited difficulty with direct weighing-ETAAS is the inability to calibrate with aqueous standards. A new method of calibration, know as extrapolation to zero matrix, was described (396). The ratio of peak height to sample mass decreases in a linear manner with increasing sample mass.…”

Section: Analysis Of Solids and Slurriesmentioning

confidence: 99%