<報文>ICP 発光分光分析における遷移金属元素の発光スペクトル強度に対する酸濃度の影響

概要

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In order to obtain reliable results by the technique of Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), it is imperative to avoid or correct for interferences caused by the matrix of the solution samples. Differences in the acid concentration between the samples and the standards can significantly affect the analytical results. This effect has been investigated by analyzing several series of solution samples. The increase in the acid concentration is obviously accompanied by an increase in the viscosity, resulting in an initial decrease of the analytical signal. Further increasing the acid concentration, however, brings about a positive effect, which is largely enhanced by applying higher HCl concentrations in the washing solution and is efficiently reduced by purging the solution feeding line of the system. The positive effect is presumably related to the enhancement of excitation. This interpretation is suggested by the comparison of results obtained by two different instruments and different kinds of acid in the samples. The obtained relative intensity functions are suitable for the mathematical correction of matrix-induced interferences, provided the conditions of washing are standardized.ICP-AESmatrix matchinginterferenceHCl concentrationsample introductionrelative intensityacid
東北大学の論文
2001-03-01