Potential impacts of water injection dredging on water quality and ecotoxicity in Limehouse Basin, River Thames, SE England, UK

The risk assessment of heavy metals in Futian mangrove forest sediment in Shenzhen Bay (South China) based on SEM–AVS analysis

“…At sites 1-13, the percentages of Pb extracted by AVS to total Pb ranged from 59.8% to 96.5%, higher than that of Cd (47.2-81.0%), Cu (5.2-65.6%), and Zn (24.4-57.1%). Thus, besides AVS content, the lower values of R 2 for Cd, Cu and Zn may also attribute to the important binding phases, such as organic matter and Fe-Mn oxyhydroxide (Spencer et al, 2006). No similar trends found at sites 14-16 may be related to disturbance from Shenzhenhe river, which deserved further investigation.…”

Assessment of sediment quality based on acid-volatile sulfide and simultaneously extracted metals in heavily industrialized area of Asaluyeh, Persian Gulf: concentrations, spatial distributions, and sediment bioavailability/toxicity

“…But, it should be noted that when SEM-AVS is higher than 0 or the ratio of SEM/AVS is higher than 1, heavy metal toxicity can be overestimated. In this condition, other components in sediment such as total organic compounds (TOCs) can also bind to free metal ions, which may decrease their bioavailability and, consequently, reduce their toxicity (Burton et al 2005;Ingersoll et al 2002;Spencer et al 2006). A modified AVS approach was suggested regarding the total organic carbon (TOC) in sediments (ƒ OC ), and it has been approved to be more appropriate than the previous approach (De Jonge et al 2010, 2012aKeene et al 2010;Zhuang and Gao 2013).…”

Effects of sediment dredging on water quality and zooplankton community structure in a shallow of eutrophic lake

“…But most of the previous studies related to effects of dredging on water quality, release of nutrients and heavy metals, benthos, algal-periphyton, bacteria, larval zooplankton, birds and aquatic plants (Brookes, 1987;DeCoursey and Vernberg, 1975;Howarth et al, 1982;Lewis et al, 2001;Lohrer and Wetz, 2003;Nayar et al, 2004;Spencer et al, 2006). Information on the effects of dredging on zooplankton community structure is rare but also inconsistent (Wang et al, 2005;Li et al, 2007;Wu et al, 2008).…”

“…Among the different restoration techniques, sediment dredging, commonly used in coastal and estuarine habitats, is a large-scale anthropogenic disturbance agent that can profoundly affect water quality, and has been widely used to treat hyper-eutrophic lakes in China. With respect to dredging, both positive and negative effects have been reported (Lohrer and Wetz, 2003;Spencer et al, 2006;Zhong and Fan, 2007). However, the effectiveness of dredging is still suspectable, and the debate on the role of dredging at an ecosystem level remains open.…”