Interactions between trace metals and plastic production pellets under estuarine conditions

被引:469
作者
Holmes, Luke A. [1 ]
Turner, Andrew [1 ]
Thompson, Richard C. [2 ]
机构
[1] Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England
[2] Univ Plymouth, Sch Biol Sci, Drake Circus, Plymouth PL4 8AA, Devon, England
关键词
Plastic pellets; Trace metals; Adsorption; Estuaries; Speciation; SPECIATION; DEBRIS; WATERS; ADSORPTION; ELEMENTS; LITTER;
D O I
10.1016/j.marchem.2014.06.001
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Pre-production pellets are an abundant form of plastic waste in the marine environment whose principal impacts arise from inadvertent ingestion by various organisms when mistaken for food. Pellets also represent a carrier for both organic and metallic contaminants through their adsorption to the modified plastic surface. In the present study, we examine the adsorption of trace metals (Cd, Co, Cr, Cu, Ni, Pb) to both virgin and beached (aged) pellets under estuarine conditions in order to better understand the role of plastic materials on the transport and behaviour of metals from river to ocean. Metals added to river water and sea water adsorbed to both pellet types with isotherms defined by either the Langmuir or Freundlich model. With increasing pH in river water, adsorption of Cd, Co, Ni and Pb increased, adsorption of Cr decreased and adsorption of Cu was relatively invariant. Along a salinity gradient, created by mixing river and sea waters in different proportions, adsorption of Cd, Co and Ni decreased, adsorption of Cr increased and adsorption of Cu and Pb exhibited a minimum towards the fresh water end-member. In all experiments and for all metals, adsorption was considerably greater to beached pellets than to virgin pellets, presumably because of the weathering of and adsorption and attrition of charged minerals by the former. Speciation considerations suggest that adsorption to the pellet surface largely involves metal cations or oxyanions (e.g. HCrO4- and CrO42-), although additional forms of Cu and Pb (e.g. organic complexes) may also be involved. Despite mass-normalised adsorption constants being lower than equivalent values defining the adsorption of metals to sediments, microplastics should be regarded as a component of the suspended load of estuaries whose precise role on contaminant transport requires further study. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:25 / 32
页数:8
相关论文
共 34 条
  • [1] The role of the Rio de la Plata bottom salinity front in accumulating debris
    Acha, EM
    Mianzan, HW
    Iribarne, O
    Gagliardini, DA
    Lasta, C
    Daleo, P
    [J]. MARINE POLLUTION BULLETIN, 2003, 46 (02) : 197 - 202
  • [2] Association of metals with plastic production pellets in the marine environment
    Ashton, Karen
    Holmes, Luke
    Turner, Andrew
    [J]. MARINE POLLUTION BULLETIN, 2010, 60 (11) : 2050 - 2055
  • [3] Transport of persistent organic pollutants by microplastics in estuarine conditions
    Bakir, Adil
    Rowland, Steven J.
    Thompson, Richard C.
    [J]. ESTUARINE COASTAL AND SHELF SCIENCE, 2014, 140 : 14 - 21
  • [4] Contaminated ground and contaminated estuary sediment illustrated by two case histories
    Bell, FG
    Lindsay, P
    Hytiris, N
    [J]. ENVIRONMENTAL GEOLOGY, 1997, 32 (03): : 191 - 202
  • [5] Spatial Patterns of Plastic Debris along Estuarine Shorelines
    Browne, Mark A.
    Galloway, Tamara S.
    Thompson, Richard C.
    [J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2010, 44 (09) : 3404 - 3409
  • [6] Costa MF, 2011, J COASTAL RES, P339
  • [7] Beach debris in Curacao
    Debrot, AO
    Tiel, AB
    Bradshaw, JE
    [J]. MARINE POLLUTION BULLETIN, 1999, 38 (09) : 795 - 801
  • [8] Trace metal behaviour in estuarine and riverine floodplain soils and sediments: A review
    Du Laing, G.
    Rinklebe, J.
    Vandecasteele, B.
    Meers, E.
    Tack, F. M. G.
    [J]. SCIENCE OF THE TOTAL ENVIRONMENT, 2009, 407 (13) : 3972 - 3985
  • [9] Daily accumulation rates of marine debris on sub-Antarctic island beaches
    Eriksson, Cecilia
    Burton, Harry
    Fitch, Stuart
    Schulz, Martin
    van den Hoff, John
    [J]. MARINE POLLUTION BULLETIN, 2013, 66 (1-2) : 199 - 208
  • [10] Surface properties of beached plastic pellets
    Fotopoulou, Kalliopi N.
    Karapanagioti, Hrissi K.
    [J]. MARINE ENVIRONMENTAL RESEARCH, 2012, 81 : 70 - 77