Toxicity of arsenic in relation to soil properties: implications to regulatory purposes

A study on soil-environmental quality criteria and standards of arsenic

“…In addition, microorganisms and some (in)vertebrates would be affected under exposure to As as well (Button et al, 2010). It is reported that EC 10 s of As for Lactuca sativa and Vibrio fischeri under different soil types were in the M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT range of 23.17-394.95 and 5.51-332.14 mg/kg, respectively, and their NOECs were in the range of 15-150 and 5-15 mg/kg, respectively (Romero-Freire et al, 2014). All of these toxicity indexes might be applied into the derivation of soil environmental quality criteria (SQC) after assessment and normalization.…”

Distribution and contamination assessment of heavy metals in soils from tidal flat, oil exploitation zone and restored wetland in the Yellow River Estuary

“…Yu et al (2011) found that the contents of total organic carbon, total nitrogen, and nitrate were significantly correlated with concentrations of Cr, Pb and Ni in the new-born coastal wetland soils of YRE and were recognized as the key factors for soil adsorption of metal elements. While some other important physical and chemical properties, such as soil moisture, pH, electric conductivity, aggregate size of soil particles are also important (Rooney et al 2006;Romero-Freire et al 2014). Wetland degradation and restoration processes occur with the specific hydrology, vegetation cover and soil properties, but little attention has been given to assess spatial variations of metals in different wetlands under the impacts of oil exploitation activities and ecological restoration project.…”

A laboratory test of NOM-assisted remediation of arsenic and copper contaminated soils

“…12 Because As and Cu are often strongly bonded to soil solids, both 13 methods often use a strong complexant to increase contaminant 14 solubility, e.g. ethylenediaminetetraacetic acid (EDTA), nitrilotri- 15 acetic acid (NTA) or similar compounds [4][5][6][7][8]. However, although 16 EDTA, NTA and other synthetic aminopolycarboxylates are effective 17 cleaning agents, they are environmentally problematic [9][10][11] 18 suggesting a need for their replacement with cheap natural organic 19 matter (NOM) compounds such as soluble humic substances (HS) 20 and citrate forming strong soluble complexes with Cu and other 21 heavy metals [2,4,5,8,9,12,13].…”

“…26 In addition to the nature of the extractant, extraction of As, Cu and 27 other heavy metals depends on soil properties, e.g. the pH, clay and 28 organic C contents, and whether spiked or long-term contaminated 29 (aged) soil is tested [2,5,14,15]. Abbreviations: HS, humic substances; NOM, natural organic matter; NTA, nitrilotriacetic acid; As, arsenic; Cu, copper; Fe, iron; CCA soil, chromium, copper and arsenic contaminated soil; CRC soil, Copenhagen Recycling Centre soil; AAS, atomic absorption spectrometry; ICP-OES, inductively coupled plasma-optical emission spectroscopy.…”