Abstract The content of mobile compounds of Zn, Pb and Cu in the hydromorphic soil samples with natural humidity from southern European Russia turned out to be much higher than in samples stored in laboratory for 1 month and, particularly, 3 years. At the same time, the extractability of heavy metals is characterized by irregular kinetics: their solubility decreases rapidly during the first month when the dry soil sample loses the initial humidity, but slowly during its further storage for 3 years. Solubility of metals in natural humid soils is highly variable. Influence of the studied reagents (CH3COONH4, EDTA and oxalate) shows the following general trend: Zn > Pb ≫ Cu. Solubility difference of metals is smoothed over in the course of soil drying. In terms of the dissolution efficiency of mobile metal compounds in the hydromorphic ferruginated soils, the extractants are arranged in the following order: oxalate > EDTA > CH3COONH4. Since the oxalate actively dissolves Fe(II)-compounds in soils, the solubility of metal is governed by the its siderophility. Zn is most intensely dissolved by oxalate, while Pb and Cu in soils demonstrate organophilic properties. However, Pb can also be sorbed on iron hydroxide particles.

中文翻译：

---

水形态土壤中重金属移动化合物含量分析的方法学问题

摘要 俄罗斯南欧自然湿度水化土壤样品中Zn、Pb和Cu的移动化合物含量远高于实验室储存1个月，尤其是3年的样品。同时，重金属的可萃取性具有不规则的动力学特征：它们的溶解度在干燥土壤样品失去初始湿度的第一个月内迅速下降，但在进一步储存 3 年期间缓慢下降。金属在天然潮湿土壤中的溶解度变化很大。所研究试剂（CH3COONH4、EDTA 和草酸盐）的影响显示出以下总体趋势：Zn > Pb ≫ Cu。在土壤干燥过程中，金属的溶解度差异被平滑。就流动金属化合物在水形铁锈土中的溶解效率而言，萃取剂的排列顺序为：草酸盐> EDTA > CH3COONH4。由于草酸盐会主动溶解土壤中的 Fe(II) 化合物，因此金属的溶解度受其嗜铁性的控​​制。Zn 最强烈地被草酸盐溶解，而土壤中的 Pb 和 Cu 表现出亲有机性。然而，铅也可以吸附在氢氧化铁颗粒上。