Complexation between metal ions and water soluble organic soil substances as analyzed by electrochemical techniques     

I. P. Makarychev  G. V. Motuzova 《Moscow University Soil Science Bulletin》2013,68(1):41-47

Conductometric and potentiometric titration of water extracts from soils using metal salt solutions (Cu, Al, Pb) were performed. A nonlinear dependence of electrical conductivity of water extracts on the concentration of metals added was established, which is caused by the formation of metal organic complexes proceeding with the participation of metal ions. A parameter describing the differential equivalent electrical conductivity (Δλ) was proposed which characterizes the complexation process, and a formula for the calculation of this parameter was given. The basic parameters of copper ion complex formation with water soluble organic substances of the extract were determined on the basis of conductometric titration of water extracts from soils using copper nitrate solution. These processes were shown to proceed differently for soddy and podzolic soils, the properties of which are known to differ significantly. An integrated parameter of the equivalent electrical conductivity for ligands of soil water soluble organic substances was assessed.  相似文献   

Specificity of the thermophysical status of an arable leached chernozem in the Ob region     

S. V. Makarychev 《Eurasian Soil Science》2007,40(8):850-853

The thermophysical status of leached chernozems in the Altai part of the Ob River basin is controlled not only by the climatic and soil features of the region but also by the method of fallow preparation for cereals. The surface treatment with a cultivator to a depth of 8–10 cm provides the best effect.  相似文献   

Water Retention Capacity of Soils in the Altai Region     

Bolotov  A. G.  Shein  E. V.  Makarychev  S. V. 《Eurasian Soil Science》2019,52(2):187-192

Eurasian Soil Science - Water retention curves (WRC) and some physical and chemical properties (particle-size composition, soil density, organic matter content, etc.) were determined for the major...  相似文献   

Effect of aluminum, zinc, copper, and lead on the acid-base properties of water extracts from soils     

G. V. Motuzova  I. P. Makarychev  M. I. Petrov 《Eurasian Soil Science》2013,46(1):44-50

The potentiometric titration of water extracts from the upper horizons of taiga-zone soils by salt solutions of heavy metals (Pb, Cu, and Zn) showed that their addition is an additional source of the extract acidity because of the involvement of the metal ions in complexation with water-soluble organic substances (WSOSs). At the addition of 0.01 M water solutions of Al(NO₃)₃ to water extracts from soils, Al³⁺ ions are also involved in complexes with WSOSs, which is accompanied by stronger acidification of the extracts from the upper horizon of soddy soils (with a near-neutral reaction) than from the litter of bog-podzolic soil (with a strongly acid reaction). The effect of the Al³⁺ hydrolysis on the acidity of the extracts is insignificantly low in both cases. A quantitative relationship was revealed between the release of protons and the ratio of free Cu²⁺ ions to those complexed with WSOSs at the titration of water extracts from soils by a solution of copper salt.  相似文献