Abstract
Abstract Germany is reported to be an iodine deficient region of the world. Therefore investigations of the iodine concentration in plants and soils are of particular importance. The low concentration of iodine (μg and ng levels) in plant and soil samples, can be determined by photometry based on the SANDELL‐KOLTHOFF‐Reaction, the reduction of Ce(IV) by As(III) catalysed by iodine. The reaction, essentially depending on time and temperature, can also be affected by the ions, such as: Cl% NO2 ‐, SCN‐, Fe2+, BrO3 ‐, MnO4 ‐, Ag+, CN‐, Hg+ and metals like Os. Using the alkaline dry ashing method by adding KOH and ZnSO4, the digestion with the calorimetric bomb and the SCHONIGER digestion arc gives reliable results for iodine determination for use in conjunction with photometric analytical techniques. For this investigation, the influence of iodine fertilisation on the iodine concentration of cress (Lepidium sativum) was determined by a pot experiment in which different amounts of iodine were added. The iodine...
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