Trace metal distribution in the sediment cores of mangrove ecosystems along northern Kerala coast, south-west coast of India.
Mar Pollut Bull
; 153: 110946, 2020 Apr.
Article
in En
| MEDLINE
| ID: mdl-32063546
ABSTRACT
Core sediment samples were collected from five mangrove ecosystems along northern Kerala coast (Kunjimangalam S1, Pazhayangadi S2, Pappinissery S3, Thalassery S4, and Kadalundi S5) to assess the status of heavy metal pollution. S1 recorded comparatively lower metal concentration at surface (except Pb) due to low organic content and sandy texture, while the reverse was true for S3. Higher metal contents were recorded at S5 (0-5â¯cm), which was attributed to its unique biogeochemical behavior. Enrichment factor and geoaccumulation index indicated moderate enrichment for Cd, and the pollution load index revealed progressive deterioration of sediment quality at S5 (0-5â¯cm). There was no harmful effect of trace metals on biological community (except Ni) according to Sediment Quality Guidelines. Major processes controlling trace metal accumulation in these systems are diagenetic processes, precipitation of heavy metals as sulfides, and the presence of Fe, Mn-oxy hydroxides, which act as adsorption sites for other metals.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Water Pollutants, Chemical
/
Environmental Monitoring
/
Metals, Heavy
Country/Region as subject:
Asia
Language:
En
Journal:
Mar Pollut Bull
Year:
2020
Document type:
Article
Affiliation country:
India