Articles
THE COMMON EXTRACTION OF TRACE ELEMENTS FROM HORTICULTURAL SOILS AND SUBSTRATES
Article number
145_32
Pages
295 – 296
Language
Abstract
The aim of this work was to design the common extraction of trace elements from horticultural soils and substrates adapted to ASA determination of Fe, Mn, Zn, and Cu and colorimetric determination of Mo in filtrates.
First two authors in MSU – USA in 1970/1971 have studied the use of procedure proposed by W. Lindsay for calcareous soils /x/. It was stated that original Lindsay’ solution does not extract enough Mo for colorimetric determination with CNS and that addition of citric acid to extraction solution does overcome this problem /xx/. It was also stated that DTPA may be replaced by EDTA. In effect the next extraction solution has been accepted: to about 100 ml water in 1 1 flask are added 5 g EDTA, 9 ml concentrated NH3 solution /25–27%/ and after EDTA dissolving – 4 g citric acid and 2 g Ca/CH3COO/. H2O and water is added to the 1 l volume.
The solution should have pH 7.3. This solution has been proposed for extraction all trace elements including Mo from horticultural soils and greenhouse substrates.
The procedure /so called modified Lindsay method, is as follows: 50 ml of soil or greenhouse substrate is measured with the aid of calibrated little pipe and shaked with 200 ml of extraction solution through 30 min
First two authors in MSU – USA in 1970/1971 have studied the use of procedure proposed by W. Lindsay for calcareous soils /x/. It was stated that original Lindsay’ solution does not extract enough Mo for colorimetric determination with CNS and that addition of citric acid to extraction solution does overcome this problem /xx/. It was also stated that DTPA may be replaced by EDTA. In effect the next extraction solution has been accepted: to about 100 ml water in 1 1 flask are added 5 g EDTA, 9 ml concentrated NH3 solution /25–27%/ and after EDTA dissolving – 4 g citric acid and 2 g Ca/CH3COO/. H2O and water is added to the 1 l volume.
The solution should have pH 7.3. This solution has been proposed for extraction all trace elements including Mo from horticultural soils and greenhouse substrates.
The procedure /so called modified Lindsay method, is as follows: 50 ml of soil or greenhouse substrate is measured with the aid of calibrated little pipe and shaked with 200 ml of extraction solution through 30 min
Authors
O. Nowosielski, E. Ellis, W. Czerniawska, A. Strahl, A. Tokarz
Keywords
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