Effect of burrowing by the crab helice crassa on chemistry of intertidal muddy sedimentsa

Williamson, R. Bruce; Wilcock, Robert J.; Wise, B.; Pickmere, S.

doi:10.1002/etc.5620180928

Cited by 20 publications

(7 citation statements)

References 42 publications

(63 reference statements)

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“…e sediment samples after the leaching test with deionised water as leachant was measured by Tessier to determine the speciation changes of the metals at different pH. e oxic (oxyhydroxides) and anoxic (sulphide) phases normally coexist at the depths of 10 cm in the sediments [26,27]. e sediment samples obtained from Xiaofu River are black color, and their redox potential is about −30 mV; therefore, the sediments were supposed to be reduced sediment.…”

Section: Tessier Sequential Extraction Experimentmentioning

confidence: 99%

pH Effect on Heavy Metal Release from a Polluted Sediment

Zhang

et al. 2018

Journal of Chemistry

106

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The performance of Cd, Ni, and Cu release from river sediment at different pH was investigated by a leaching test using deionised water and river water as leachants. Visual MINTEQ geochemical software was used to model the experimental results to predict heavy metal release from sediments. The distribution and speciation of heavy metals in the sediments after leaching test were analyzed by Tessier sequential extraction. Leaching test results showed that the release amounts of Cd, Ni, and Cu are in the range of 10.2–27.3 mg·kg−1, 80.5–140.1 mg·kg−1, and 6.1–30.8 mg·kg−1, respectively, with deionised water as leachant at different pH. As far as the river water was used as the leaching solution in the test, the results show similar metal leaching contents and tendencies to that of the deionised water as leaching solution. The results of Tessier sequential extraction indicate that Cd of residual fraction easily forms obvious precipitate under the acidic condition, especially in the range of pH 0–4 with the residual of Cd over 50% of the total Cd in the sediment. The exchangeable content of Ni decreases with the increase of pH under the range of 0–5. The Fe-Mn oxide fraction of Cu in the sediments changes significantly from pH 0 to pH 9. Based on the effect of pH on the leaching of Cd, Ni, and Cu from the polluted sediment in the tests, more accurate information could be obtained to assess the risk related to metal release from sediments once it is exposed to the changed acid/alkali water conditions.

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Section: Tessier Sequential Extraction Experimentmentioning

confidence: 99%

pH Effect on Heavy Metal Release from a Polluted Sediment

Zhang

et al. 2018

Journal of Chemistry

106

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“…Although the sampled sediment is considered superficial because the maximum depth is about 10 centimetres it is supposed to be a reduced sediment due to the black and not grey colour and the negative redox potential, presenting values as low as -130 mV. In many sediments, redox zonation is not clear, and oxic (oxyhydroxides) and anoxic (sulphide) phases coexist at that depths (Burdige, 1993;Williamson et al, 1999;Simpson et al, 2000).…”

Section: Modelling Of Metal Leaching Data Using Visual Minteq Softwarementioning

confidence: 99%

Metal Release from Contaminated Estuarine Sediment Under pH Changes in the Marine Environment

Martín-Torre

Payán

Verbinnen

et al. 2015

Arch Environ Contam Toxicol

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The contaminant release from estuarine sediment due to pH changes was investigated using a modified CEN/TS 14429 pH-dependence leaching test. The test is performed in the range of pH values of 0-14 using deionised water and seawater as leaching solutions. The experimental conditions mimic different circumstances of the marine environment due to the global acidification, carbon dioxide (CO2) leakages from carbon capture and sequestration technologies, and accidental chemical spills in seawater. Leaching test results using seawater as leaching solution show a better neutralisation capacity giving slightly lower metal leaching concentrations than when using deionised water. The contaminated sediment shows a low base-neutralisation capacity (BNCpH 12 = -0.44 eq/kg for deionised water and BNCpH 12 = -1.38 eq/kg for seawater) but a high acid-neutralisation capacity when using deionised water (ANCpH 4 = 3.58 eq/kg) and seawater (ANCpH 4 = 3.97 eq/kg). Experimental results are modelled with the Visual MINTEQ geochemical software to predict metal release from sediment using both leaching liquids. Surface adsorption to iron- and aluminium-(hydr)oxides was applied for all studied elements. The consideration of the metal-organic matter binding through the NICA-Donnan model and Stockholm Humic Model for lead and copper, respectively, improves the former metal release prediction. Modelled curves can be useful for the environmental impact assessment of seawater acidification due to its match with the experimental values.

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“…This effect will be most pronounced in sediment in which steep vertical gradients in the content of reduced solids exist. However, such gradients may not exist if large bioturbators such as sea urchins, brittle stars and mud crabs heavily rework the sediment (Williamson et al 1999).…”

Section: Discussionmentioning

confidence: 99%

“…Biles et al 2002, Norling et al 2007). Bioturbation also influences other processes that couple the functioning of the sediment and the overlying seawater, for example particle resuspension (Widdows et al 2004), contaminant cycling (Williamson et al 1999), benthic primary production (Vopel et al 2007) and recruitment (Woodin et al 1998, Marinelli & Woodin 2002. One inevitable consequence of sediment surface disturbance is the exposure of suboxic or reduced sediment to oxygenated seawater.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of surface sediment: effects of disturbance depth and seawater flow speed

Vopel¹,

Pilditch²,

Wilson³

et al. 2009

Mar. Ecol. Prog. Ser.

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Periodic disturbance of surface sediment is a natural feature of marine environments. Following exposure to oxygenated seawater, the disturbed sediment oxidises leading to the recovery of its surface chemistry. Despite its importance for the ecology of the sediment -water interface, the dynamics of this recovery is not well known. We studied the effects of disturbance depth and seawater flow speed on the oxidation of estuarine cohesive sediment in a laboratory flume with microelectrodes. We removed surface sediment to 2 depths (5 and 50 mm) and then observed changes in sediment O 2 distribution and consumption over 1 h under conditions of slow and fast flow (3.5 and 7.5 cm s -1 ). Measurements were repeated 1 d later. The consumption of O 2 in the treated sediments reached a 'quasi stable state' within 7 h (50 mm depth) and 16 h (5 mm depth) characterised by very slow changes due to slow oxidation of reduced solids. Faster flow increased the rate at which sediment from 50 mm depth oxidised but not that of the sediment from 5 mm depth. After 20 to 24 h, sediments disturbed to 50 and 5 mm depths still differed in O 2 distribution and consumption, both from each other and from the pre-treatment sediment. Differences in the response of pore water O 2 distribution to an abrupt increase in flow speed (3.5 to 7.5 cm s -1 ) were also still evident at this time. Our measurements confirmed the results of previous theoretical analyses in that they indicate that the duration of the recovery of the surface sediment chemistry from disturbance and the chemical properties of the recovering sediment are controlled by the kinetics of solute and solid oxidation. Oxidation of reduced solids in disturbed sediment can result in a characteristic chemical signature at the sediment surface that lasts in the order of at least days. KEY WORDS: Cohesive sediment · Oxygen flux · Sediment respiration · RecoveryResale or republication not permitted without written consent of the publisher

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Effect of burrowing by the crab helice crassa on chemistry of intertidal muddy sedimentsa

Cited by 20 publications

References 42 publications

pH Effect on Heavy Metal Release from a Polluted Sediment

pH Effect on Heavy Metal Release from a Polluted Sediment

Metal Release from Contaminated Estuarine Sediment Under pH Changes in the Marine Environment

Oxidation of surface sediment: effects of disturbance depth and seawater flow speed

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