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The Effectiveness and Feasibility of Using Ochre as a Soil Amendment to Sequester Dissolved Reactive Phosphorus in Runoff

Fenton, Owen ; Kirwan, Laura ; Ó hUallacháin, Daire ; Healy, Mark

Water, Air, & Soil Pollution, 2012, Vol.223(3), pp.1249-1261 [Tạp chí có phản biện]

ISSN: 0049-6979 ; E-ISSN: 1573-2932 ; DOI: 10.1007/s11270-011-0941-3

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  • Nhan đề:
    The Effectiveness and Feasibility of Using Ochre as a Soil Amendment to Sequester Dissolved Reactive Phosphorus in Runoff
  • Tác giả: Fenton, Owen ; Kirwan, Laura ; Ó hUallacháin, Daire ; Healy, Mark
  • Chủ đề: Phosphorus ; Adsorption ; Ochre ; Water quality
  • Là 1 phần của: Water, Air, & Soil Pollution, 2012, Vol.223(3), pp.1249-1261
  • Mô tả: Incidental losses of dissolved reactive phosphorus (DRP) to a surface waterbody originate from direct losses during land application of fertilizer, or where a rainfall event occurs immediately thereafter. Another source is the soil. One way of immobilising DRP in runoff before discharge to a surface waterbody, is to amend soil within the edge of field area with a high phosphorus (P) sequestration material. One such amendment is iron ochre, a by-product of acid mine drainage. Batch experiments utilising two grassland soils at two depths (topsoil and sub-soil), six ochre amendment rates (0, 0.15, 1.5, 7.5, 15 and 30 g kg −1 mass per dry weight of soil) and five P concentrations (0, 5, 10, 20 and 40 mg L −1 ) were carried out. A proportional equation, which incorporated P sources and losses, was developed and used to form a statistical model. Back calculation identified optimal rates of ochre amendment to soil to ameliorate a specific DRP concentration in runoff. Ochre amendment of soils (with no further P inputs) was effective at decreasing DRP concentrations to acceptable levels. A rate of 30 g ochre kg −1 soil was needed to decrease DRP concentrations to acceptable levels for P inputs of ≤10 mg L −1 , which represents the vast majority of cases in grassland runoff experiments. However, although very quick and sustained metal release above environmental limits occurred, which makes it unfeasible for use as a soil amendment to control P release to a waterbody, the methodology developed within this paper may be used to test the effectiveness and feasibility of other amendments.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0049-6979 ; E-ISSN: 1573-2932 ; DOI: 10.1007/s11270-011-0941-3

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