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- W2054581493 abstract "The design of multielement calibration schemes for ICP-AES has a critical effect upon the the accuracy of analyte determinations. Matrix effects within multielement calibration solutions are unavoidable, and produce changes in sensitivity and calibration curvature that are not necessarily equal to those in the sample solutions. Differential matrix effects that occur between calibration solutions and samples lead to analytical bias. The problem is most severe where samples are analysed at high concentration factors to maximize trace-element detection (typical > 10 g1 −1 ). The bias affects both major and trace elements. Various calibration strategies are considered in this paper for their ability to reduce differential matrix effects between calibration solutions and samples. The internal standard method is considered the most appropriate, but it is limited by its inability to allow for the variations in bias for different analytes in the same matrix. A general solution to the problem is proposed that applies the parameter-related internal standard method (PRISM) to the intensity measurements of the calibration solutions. This reduces the bias due to the matrix effects which concomitant analytes produce. The sensitivity of each analyte is returned to that which would have been measured if the analyte were present in a single-element solution, with no matrix effects. At the same time PRISM also reduces the self-matrix effect that can contribute to the curvature of an analyte calibration. The linear range of Ca II 317.93 nm, for example, can be extended by an order of magnitude using this method. The strategy enables a multielement calibration to be designed for minimum detection limits of trace elements in a wide range of sample compositions, and obviates the need for matrix matching." @default.
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- W2054581493 date "1992-01-01" @default.
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- W2054581493 title "Strategies of multielement calibration for maximising the accuracy of geochemical analysis by inductively coupled plasma-atomic emission spectrometry" @default.
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- W2054581493 doi "https://doi.org/10.1016/0009-2541(92)90047-9" @default.
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