Environmental Sciences Group, Royal Military College, PO Box 17 000, Station Forces, Kingston, Ontario K7K7B4, Canada.
Environ Pollut. 2011 Oct;159(10):2530-6. doi: 10.1016/j.envpol.2011.06.018. Epub 2011 Jul 22.
Arsenic-contaminated soils may pose a risk to human health. Redevelopment of contaminated sites may involve amending soils with organic matter, which potentially increases arsenic bioaccessibility. The effects of ageing on arsenic-contaminated soils mixed with peat moss were evaluated in a simulated ageing period representing two years, during which arsenic bioaccessibility was periodically measured. Significant increases (p = 0.032) in bioaccessibility were observed for 15 of 31 samples tested, particularly in comparison with samples originally containing >30% bioaccessible arsenic in soils naturally rich in organic matter (>25%). Samples where percent arsenic bioaccessibility was unchanged with age were generally poor in organic matter (average 7.7%) and contained both arsenopyrite and pentavalent arsenic forms that remained unaffected by the organic matter amendments. Results suggest that the addition of organic matter may lead to increases in arsenic bioaccessibility, which warrants caution in the evaluation of risks associated with redevelopment of arsenic-contaminated land.
受砷污染的土壤可能对人类健康构成威胁。受污染场地的再开发可能涉及用有机物改良土壤，这可能会增加砷的生物可利用性。在模拟老化期内，评估了受砷污染的土壤与泥炭藓混合后的老化效应，该模拟老化期代表了两年的时间，在此期间定期测量了砷的生物可利用性。在 31 个测试样本中，有 15 个样本的生物可利用性显著增加（p = 0.032），特别是与原本在天然富含有机物的土壤中（>25%）含有 >30%生物可利用砷的样本相比。随着时间的推移，生物可利用性没有变化的样本通常有机物含量较低（平均为 7.7%），并且同时含有砷黄铁矿和五价砷形态，这些形态不受有机物改良的影响。结果表明，添加有机物可能会导致砷的生物可利用性增加，这在评估与受砷污染土地的再开发相关的风险时需要谨慎。
