Ecotoxicological assessment of flocculant modified soil for lake restoration using an integrated biotic toxicity index

Wang, Z., Zhang, H. and Pan, G. ORCID: 0000-0003-0920-3018, 2016. Ecotoxicological assessment of flocculant modified soil for lake restoration using an integrated biotic toxicity index. Water Research, 97, pp. 133-414. ISSN 0043-1354

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Flocculantmodified soils/clays are being increasingly studied as geo-engineering materials for lake restoration and harmful algal bloom control. However, the potential impacts of adding these materials in aquatic ecological systems remain unclear. This study investigated the potential effects of chitosan, cationic starch, chitosan modified soils (MS-C) and cationic starch modified soils (MS-S) on the aquatic organisms by using a bioassay battery. The toxicity potential of these four flocculants was quantitatively assessed using an integrated biotic toxicity index (BTI). The test system includes four aquatic species, namely Chlorella vulgaris, Daphnia magna,CyprinuscarpioandLimnodrilushoffmeisteri, which represent four trophic levels in the freshwater ecosystem. Results showed that median effect concentrations (EC50) of the MS-C and MS-S were 31 to 124 times higher than chitosan and cationic starch, respectively. D. magna was the most sensitive species to the four flocculants.Histological examination of C. carpio showed that significant pathological changes were found in gills. Different from chitosan and cationic starch, MS-C and MS-S did not apparentlyalter the solution viscosity but significantly alleviated the acute toxicities of chitosan and cationic starch. The toxicity order of the four flocculants based on BTI were cationic starch>chitosan>MS-S>MS-C. The results suggested that BTI can be used as a quantitative and comparable indicator to assess biotic toxicity for aquatic geo-engineering materials. Chitosan or cationic starch modified soil/clay materials can be used at their optimal dosage without causing substantial adverse effects to the bioassay battery in aquatic ecosystem.

Item Type: Journal article
Publication Title: Water Research
Creators: Wang, Z., Zhang, H. and Pan, G.
Publisher: Elsevier
Date: 15 June 2016
Volume: 97
ISSN: 0043-1354
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Linda Sullivan
Date Added: 11 May 2016 14:46
Last Modified: 09 Jun 2017 14:02

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