Abstract:
:To effectively manage a watershed and successfully restore a river system, it is very important to assess the toxicity of sediments and identify the substances causing the toxicity. Seventy-six sediments collected in the Haihe River Basin (HRB) in China were screened for acute toxicity using Chironomus dilutus. We found that sediments from more than 32% of sampling sites, distributed mainly in the Ziya tributary and along the estuary, were acutely toxic to midges. A toxicity identification evaluation showed that the toxicity of the sediment samples was mainly from ammonia nitrogen, metals, and organics. Calculations of the toxic unit (TU) showed that ammonia and metals contributed more to sediment toxicity than organics, and that PAHs may have contributed in other tributaries. A modified three-step sequential extraction procedure to assess the bioavailability of the metals indicated that the toxicity from metals was mainly from Cd and Zn. This is one of the first studies in which this type of approach has been applied to directly connect contaminants with ecological effects in the HRB.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zhu X,Shan B,Tang W,Zhang Cdoi
10.1038/s41598-017-01631-5subject
Has Abstractpub_date
2017-05-03 00:00:00pages
1438issue
1issn
2045-2322pii
10.1038/s41598-017-01631-5journal_volume
7pub_type
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