Application of Electro-Ultrafiltration (EUF) in Agricultural by K. Németh (auth.), K. Németh (eds.)

By K. Németh (auth.), K. Németh (eds.)

The Symposium was once prepared by way of the Hungarian Ministry of Agriculture and the vital examine Institute for Chemistry of the Hungarian Academy of Sciences. This hard job used to be coordinated through Dr. Varju to whom I desire to exhibit my appreciation for his whole-hearted information. After the Symposium the individuals had the chance to go to the vineyards and cellars of the 'Balatonboglar' country keeping which proved of serious curiosity. the 1st overseas EUF Symposium owes its good fortune to the superb cooperation among the Biintehof Agricultural learn Station and the Hungarian Ministry of Agriculture, together with the primary learn Institute for Chemistry of the Hungarian Academy of Sciences. the target of the Symposium was once to give the 1st effects and adventure won with the EUF technique, in order that the papers added are just a survey of the present-day kingdom of information. the majority of the paintings of enhancing, together with the choice of the articles, fell on Prof. Dr. van Diest, Wageningen, for whose invaluable recommendation and untiring efforts I desire to list my specific thank you. many of the papers offered on the Symposium have already been released in other places and they're going to no longer seem during this issue.

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Additional info for Application of Electro-Ultrafiltration (EUF) in Agricultural Production: Proceedings of the First International Symposium on the Application of Electro-Ultrafiltration in Agricultural Production, organized by the Hungarian Ministry of Agriculture and the

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0rup 3. 0rja 5. S. Ugglarp 6. 2 --~~--~-- REPRODUCIBILITY OF EUF METHOD 41 Another important question is whether it is sufficient to determine anions only in the anode extract and cations only in the cathode extract. We have found that a large portion of the cations may in some cases collect in the anode extract and anions in the cathode extract, especially at the start of the extraction. Table 5 illustrates this situation with the distribution of K ions over the anode and cathode extracts. During the first five minutes of EUF extraction of the Fjardingslov soil almost half of the desorbed K entered the anode extract.

Desorption takes place from a multilayered P source (such as a rock phosphate particle) the surface coverage of which does not change during the limited time of desorption. It appears that the rock phosphate has remained unaltered in this carbonate-containing soil and dissolves with a constant rate since the dissolution products are continuously being removed. Soil I ~ Superphosphate 20 ....... Basic slag c;:" <::::> c:::>. ~ ~ Rock phosphate Po 10 '"t:J 0 Fig. 1. 0 10 20 Time (min) Cumulative desorption curves (Soil I).

142,57-68. Nemeth K 1972 Bodenuntersuchung mittels Elektro-Ultrafiltration (EUF) mit mehrfach variierter Spannung. Landwirtsch. Forsch. Sonderh. 27,184--196. Nemeth K 1976 Die effektive und potentielle Niihrstoffverfiigbarkeit im Boden und ihre Bestimmung mittels Elektro-Ultrafiltration. Habil. Schrift, Universitiit Gief3en. Test of the electro-ultrafiltration method's applicability in soil analysis. Reproducibility of the method G. SIMAN Dept. of Soil Sciences, Swedish University of Agricultural Sciences, S-750 07 Uppsala 7, Sweden Key words Electro-Ultra-Filtration Soil analyses Summary The applicability of the Electro-Ultra-Filtration (EUF) method in soil analyses was studied.

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