Abstract
Abstract An atomic absorption spectroscopic method is described for the quantitative determination of 0.0005–0.01% (5–100 ppm) copper and nickel in tea. After acid decomposition of the organic material, the sample is aspirated into an air-acetylene flame. Radiation at 324.7 nm from a copper hollow cathode is passed through the flame, and the attenuation is measured. The measurement is also made with radiation at 232.0 nm with a nickel hollow cathode. The spectrophotometer is calibrated with known concentrations of copper and nickel in the presence of a matrix similar to that of the samples. The method is applicable to all teas regardless of their geographical origin. Results from 7 collaborators on 6 samples are given. For one sample from 7 collaborators the following mean standard deviations were obtained for 32 determinations: copper 19.5±1.7 ppm and nickel 26.0±1.0 ppm. The method has been adopted as official first action.
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