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Summary An automatic method for the colorimetric determination of Al in soil extracts using catechol violet was developed. The method is very reproducible and precise. The manifold arrangement covers a range of 0–1 μg ml−1. By using a dilution loop, solutions containing up to 10 μg ml−1 can be analysed. The method compares favourable with a manual catechol violet method and the alumin on method.
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Grigg et al. (1982) studied this question.
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