Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Universidade de Santiago de Compostela, campus univ. s/n, 27002, Lugo, Spain.
Department of Plant Biology and Soil Science, Faculty of Sciences, Universidade de Vigo, Campus univ. Ourense, 32004, Ourense, Spain.
Environ Sci Pollut Res Int. 2019 Apr;26(12):11558-11564. doi: 10.1007/s11356-018-2267-9. Epub 2018 May 13.
Batch experiments were used to test P sorbent potential of soil samples, pyritic and granitic materials, mussel shell, mussel shell ash, sawdust, and slate waste fines for different pH and incubation times. Maximum P sorption varied in a wide range of pH: < 4 for pyritic material, 4-6 for forest soil, > 5 for slate fines, > 6 for shell ash, and pH 6-8 for mussel shell. P sorption was rapid (< 24 h) for forest soil, shell ash, pyritic material, and fine shell. On the opposite side, it was clearly slower for vineyard soil, granitic material, slate fines, pine sawdust, and coarse shell, with increased P sorption even 1 month later. For any incubation time, P sorption was > 90% in shell ash, whereas forest soil, pyritic material, and fine shell showed sorption rates approaching 100% within 24 h of incubation. These results could be useful to manage and/or recycle the sorbents tested when focusing on P immobilization or removal, in circumstances where pH changes and where contact time may vary from hours to days, thus aiding to diminish P pollution and subsequent eutrophication risks, promoting conservation and sustainability.
采用批量实验的方法，研究了不同 pH 值和孵育时间下，土壤样品、黄铁矿和花岗岩材料、贻贝壳、贻贝壳灰、木屑和板岩废料细粉对磷的吸附潜力。磷的最大吸附量在很大的 pH 值范围内变化：黄铁矿材料为 <4，森林土壤为 4-6，板岩细粉为 >5，壳灰为 >6，贻贝壳为 pH 6-8。森林土壤、壳灰、黄铁矿材料和细贝壳的磷吸附速度很快（<24 h）。相反，葡萄园土壤、花岗岩材料、板岩细粉、松木木屑和粗贝壳的磷吸附速度明显较慢，甚至在 1 个月后仍有增加。对于任何孵育时间，壳灰中的磷吸附率均>90%，而在孵育 24 h 内，森林土壤、黄铁矿材料和细贝壳的吸附率均接近 100%。这些结果对于关注磷固定或去除的情况下，管理和/或回收所测试的吸附剂可能非常有用，因为在这种情况下，pH 值会发生变化，接触时间可能从几小时到几天不等，从而有助于减少磷污染和随后的富营养化风险，促进保护和可持续性。
