孔水中的度在土壤化过程中可以很大程度上增加:对肥料中Cd限值产生影响的文物
Benoit Bergen1, Claudia Moens1, Erik Smolders1
1Division of Soil and Water Management, KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium.
The Science of the total environment
|May 28, 2024
概括
准确的土壤 (Cd) 质量平衡需要现场淡孔水数据. 用储存的土壤校准的实证模型高估了由于非平衡条件和干燥工件而导致的Cd出.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 农业土壤中准确的 (Cd) 质量平衡对于环境风险评估至关重要.
- 现有的实证模型往往预测Cd出率高于在现场观察到的.
- 这种差异可能源于非平衡水流和土壤样本处理工件.
研究的目的:
- 调查农业土壤中 (Cd) 浸出低估的原因.
- 为了测试偏好流和土壤干燥/重新湿周期影响孔水Cd度的假设.
- 评估使用新鲜和化土壤孔水的经验模型的性能.
主要方法:
- 孔水从27个对比的农业土壤中采集,使用离心法.
- 从野外新鲜土壤和化后 (28天,20°C) 分析了样本,并进行了干燥-重新湿周期.
- 测量孔水中的Cd,pH,酸盐和 (Ca) 度.
- 经验模型被用来预测孔水中的Cd度.
主要成果:
- 化显著增加了孔水Cd (平均系数为4,高达16),与化和pH/酸盐变化有关.
- 较高的孔水 (Ca) 与新鲜土壤中的Cd度增加相关,表明聚合效应.
- 经验模型在淡孔水中过度预测了Cd (高达30倍),但与化土壤数据相匹配.
- 在高Ca土壤中偏差最大,表明缺乏局部平衡.
结论:
- 土壤的干燥和重新湿周期,以及化诱导的化,改变孔水中的 (Cd) 度.
- 高土壤 (Ca) 促进土壤聚合,导致不平衡条件并影响田野新鲜土壤中的Cd分布.
- 经验模型需要与现场新鲜孔水数据进行重新校准,以获得准确的土壤Cd质量平衡和风险评估.
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