Área de Edafoloxía e Química Agrícola, Dept. Bioloxía Vexetal e Ciencia do Solo (Plant Biol. and Soil Sci.), Fac. Ciencias, Univ. Vigo, Campus de Ourense, As Lagoas s/n, 32004 Ourense, Spain.
J Hazard Mater. 2013 Mar 15;248-249:122-30. doi: 10.1016/j.jhazmat.2012.12.045. Epub 2013 Jan 3.
Batch and column experiments are used to study the effects of ground mussel shell amendment on the retention of heavy metals in acidic mine soil. The soil pH increases proportionally with the mussel shell concentration employed. Mussel shell amendment increases Cu, Cd, Ni and Zn retention in mine soil when compared with unamended soil. In fact, Cu retention was 6480μmolkg(-1) (43% of the total added) when the maximum metal concentration (1570μM) was added to the unamended soil, whereas retention reached 15,039μmolkg(-1) (99.9% of the total Cu added) when soil was amended with 24gkg(-1) mussel shell; in the case of Cd, adsorption increases from 3257μmolkg(-1) (15% of the total added) for the unamended soil, to 13,200μmolkg(-1) (87% of the total added) for the shell-amended soil; Ni retention increased from 3767μmolkg(-1) (25% of the total added) corresponding to unamended soil, to 11,854μmolkg(-1) (77% of the total added) for the shell-amended soil; and finally, Zn retention increased from 4684μmolkg(-1) (31% of the total added), for unamended soil, to 14,952μmolkg(-1) (98% of the total added) for shell-amended soil. The results of the constant flow transport experiments show that the addition of the 24gkg(-1) mussel shells can retain Cu, Cd, Ni and Zn within the first few centimetres of the column length, indicating the usefulness of ground mussel shells to drastically decrease the mobility and availability of these pollutants and to facilitate soil remediation.
采用批次和柱实验研究了底栖贻贝壳添加对酸性矿山土壤重金属保留的影响。土壤 pH 值随使用的贻贝壳浓度呈比例增加。与未添加贻贝壳的土壤相比，贻贝壳添加增加了矿山土壤中 Cu、Cd、Ni 和 Zn 的保留。实际上，当最大金属浓度（1570μM）添加到未添加贻贝壳的土壤中时，Cu 的保留量为 6480μmolkg(-1)（总添加量的 43%），而当土壤添加 24gkg(-1)贻贝壳时，保留量达到 15039μmolkg(-1)（总 Cu 添加量的 99.9%）；对于 Cd，吸附从未添加贻贝壳的土壤中的 3257μmolkg(-1)（总添加量的 15%）增加到添加贻贝壳的土壤中的 13200μmolkg(-1)（总添加量的 87%）；Ni 的保留量从未添加贻贝壳的土壤中的 3767μmolkg(-1)（总添加量的 25%）增加到添加贻贝壳的土壤中的 11854μmolkg(-1)（总添加量的 77%）；最后，Zn 的保留量从未添加贻贝壳的土壤中的 4684μmolkg(-1)（总添加量的 31%）增加到添加贻贝壳的土壤中的 14952μmolkg(-1)（总添加量的 98%）。恒流传输实验的结果表明，添加 24gkg(-1)贻贝壳可以在柱长的前几厘米内保留 Cu、Cd、Ni 和 Zn，这表明底栖贻贝壳可有效地降低这些污染物的迁移性和可利用性，促进土壤修复。
