Evaluation of analytical performance of low-power MIP-AES with direct solution nebulization for environmental analysis

Abstract

Argon MIP-AES with wet aerosol introduction after ultrasonic nebulization was evaluated as a multi-element method for environmental analysis of water samples. Analytical wavelengths appropriate for the MIP radiation source were selected for elements included in ISO regulation 11885 concerning water quality control by means of ICP-AES. The analytical performance of the MIP-AES method was investigated under compromise operating conditions, including determination of detection limits for all the elements of interest and linear dynamic responses as well as RSDs of the signals measured for some of the elements. Typical detection limits of 31 elements studied were 0.3-1000 µg l ^–1 . The results obtained were compared with the analytical figures of merit given by conventional ICP-AES. The contract required detection limits taken from the EPA Contract Laboratory Program and maximum admissible concentrations for water pollutants recommended by WHO were also used for evaluating the suitability of MIP-AES. The accuracy and precision of the method were investigated by the determination of some minor (10-500 µg l ^–1 ) and major (up to 100 mg l ^–1 ) constituents in certified water samples.