Abstract Concern has been raised about the potential formation of acid sulfate soils and associated environmental problems related to peat extraction and, thus, peat, sediment and till characteristics of 15 well drained peat extraction fields were investigated in northern and northwestern Finland. The aim was to identify and characterize the occurrence/abundance of potential acid (hypersulfidic) and actual acid sulfate soil materials as well as metals with regards to their depositional environment (marine/non-marine), black schists and soil material properties. Sulfide-bearing marine sediments were commonly found; the highest contents and thickness of sulfide sediments were found in areas 100 m a.c.s.l.). The highest content of sulfides in sediments was typically found just below the peat layer. The sulfides existed mostly as pyrite (up to 3.5 wt% S) but were occasionally also mixed with more reactive metastable sulfide (Fe:S ratio in the order of 1:1), which coincide with high Fe concentrations, indicating that an abundance of Fe2+ can diminish the rate of pyrite formation. Sediments contained very high amounts of potential acidity, but in-field oxidation of the sediments was very limited. Although the sulfur contents were much lower (max 0.3% S), several of the till samples still became acidic (pH

中文翻译：

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芬兰北部泥炭开采区含硫化物土壤材料的特征

摘要 酸性硫酸盐土壤的潜在形成以及与泥炭开采相关的相关环境问题引起了人们的关注，因此，对芬兰北部和西北部 15 个排水良好的泥炭开采场的泥炭、沉积物和耕作特征进行了调查。目的是确定和表征潜在酸性（高硫化物）和实际酸性硫酸盐土壤材料以及金属的沉积环境（海洋/非海洋）、黑色片岩和土壤材料特性的发生/丰度。通常发现含硫化物的海洋沉积物；在 100 m acsl 区域发现了最高含量和厚度的硫化物沉积物。沉积物中硫化物的最高含量通常位于泥炭层下方。硫化物主要以黄铁矿形式存在（最多 3. 5 wt% S)，但偶尔也会与反应性更强的亚稳态硫化物混合（Fe:S 比例约为 1:1），这与高 Fe 浓度相吻合，表明丰富的 Fe2+ 可以降低黄铁矿的形成速率。沉积物含有非常高的潜在酸度，但沉积物的现场氧化作用非常有限。尽管硫含量要低得多（最大 0.3% S），但一些样品仍呈酸性（pH