Summary
The specific determination of As(III) and As(V) in nutrient solution and in plant samples leads to considerable errors, if the valency state of inorganic arsenic changes during the course of the experiment. The presented data show that the initial valency of arsenic can be altered in nutrient solution by biotic (microorganisms) as well as abiotic (chemical) reactions. In studies with dried plant material the manner and degree of sample storage leads to a change of the oxidation state. Generally, oxidation of As(III) to As(V) was observed whereas the pentavalent form of arsenic was quite stable.
An analytical method is described for the specific determination of As(III) and As(V), which has no influence upon the valency of inorganic arsenic. The recovery rates for As(III) and As(V) ranged between 95.3% and 102.9%.
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Berghoff, R.L., von Willert, D.J. Störungen bei der quantitativen Bestimmung von As(III) und As(V) in Nährlösung und in Pflanzenmaterial. Z. Anal. Chem. 331, 42–45 (1988). https://doi.org/10.1007/BF00473894
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DOI: https://doi.org/10.1007/BF00473894