本文選題：砷 + 形態(tài)��； 參考：《環(huán)境科學》2016年06期

【摘要】：土壤中As的不同存在形態(tài)影響著其毒性、可移動性、生物有效性,且產(chǎn)生不同的環(huán)境影響.本研究以粉煤灰、干化污泥、硫酸亞鐵、碎花生殼為穩(wěn)定劑,探討其對土壤As的穩(wěn)定化效果以及p H、有機質(zhì)和陽離子交換量與土壤As形態(tài)的關系.結果表明添加穩(wěn)定劑后,土壤p H及有機質(zhì)含量上升,殘渣態(tài)砷含量升高.添加10%粉煤灰、10%干化污泥后,可交換態(tài)As、碳酸鹽結合態(tài)As、鐵錳氧化物結合態(tài)As、有機結合態(tài)As分別下降了34.2%、17.5%、19.9%、53.7%,并轉(zhuǎn)化為殘渣態(tài)As,其含量增長了1.14%.當同時添加10%粉煤灰、10%干化污泥和1%硫酸亞鐵后,土壤中可交換態(tài)As、碳酸鹽結合態(tài)As、鐵錳氧化物結合態(tài)As、有機結合態(tài)As含量的降幅分別為62.3%、55.2%、29.6%、58.2%,殘渣態(tài)As含量增加8.1%.添加10%粉煤灰、10%干化污泥、1%硫酸亞鐵和1%粉碎花生殼后,可交換態(tài)As下降最顯著,最大降幅為73.3%.施用適量的粉煤灰、干化污泥、硫酸亞鐵能使土壤中的可交換態(tài)、碳酸鹽結合態(tài)、鐵錳氧化物結合態(tài)、有機結合態(tài)As的一部分轉(zhuǎn)化為殘渣態(tài)As,降低其毒性.提高p H,殘渣態(tài)As含量上升,可交換態(tài)As、碳酸鹽結合態(tài)As、鐵錳結合態(tài)As、有機結合態(tài)As含量下降,As在接近中性的環(huán)境中穩(wěn)定性最好;提高有機質(zhì)含量,碳酸鹽結合態(tài)As與殘渣態(tài)As含量上升,可交換態(tài)As、鐵錳結合態(tài)As、有機結合態(tài)As含量下降,有機結合態(tài)As含量下降明顯;陽離子交換量上升,殘渣態(tài)As含量上升,可交換態(tài)As、碳酸鹽結合態(tài)As、鐵錳結合態(tài)As、有機結合態(tài)As含量下降.
[Abstract]:Different forms of as in soil affect its toxicity, mobility, bioavailability and environmental effects. In this study, fly ash, dried sludge, ferrous sulfate and peanut shell were used as stabilizers to study the stabilization effect of as in soil and the relationship between pH, organic matter and cation exchange capacity and soil as speciation. The results showed that the content of pH and organic matter increased and the content of residual arsenic increased after the addition of stabilizer. When 10% fly ash and 10% dry sludge were added, exchangeable As, carbonate bound As, iron-manganese oxide bound As, organic bound Asdecreased respectively by 34.2and 17.5and 19.9cm, respectively, and transformed into residual As.The content increased by 1.14. When 10% fly ash 10% dry sludge and 1% ferrous sulfate were added at the same time, the contents of exchangeable as, carbonate bound As, iron-manganese oxide bound Asand organic bound Asin in the soil decreased by 62.3% and 55.2%, respectively, and the residual as content increased by 8.1%. After adding 10% fly ash and 10% dry sludge, 1% ferrous sulfate and 1% crushed peanut shell, the exchangeable as decreased most significantly, and the biggest decrease was 73.3%. By applying proper amount of fly ash, dried sludge and ferrous sulphate, the exchangeable state, carbonate bound state, iron-manganese oxide bound state, organic bound state of as can be transformed into residual Asstate, and its toxicity can be reduced. The content of residual as increased, exchangeable as, carbonate bound As, iron-manganese bound As, organic bound arsenic decreased, and the stability of organic bound as was the best in the neuter environment, and the content of organic matter was increased. The contents of carbonate bound as and residual as increased, exchangeable as, iron and manganese bound As, organic bound as, cationic exchange capacity increased, residual as content increased. The contents of exchangeable as, carbonate bound As, iron and manganese bound Asand organic bound Aswere decreased.
【作者單位】： 環(huán)境保護部華南環(huán)境科學研究所土壤污染控制與修復實驗室;深圳市環(huán)境科學研究院;
【基金】：廣東省教育部產(chǎn)學研結合項目(2012B091000152) 廣東省科技計劃項目(2013B020700010) 公益性科研院所基本科研院業(yè)務費專項(pm-zx021-201410-023)
【分類號】：X751;X53

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本文編號：2005678