Surficial sediment-heavy metal associations in the avon-heathcote estuary, new zealand


Journal Article

Adsorbed Zn, Cu, Pb, Cr, and Ni were extracted from surficial sediment samples of 330 sites in the Avon-Hcathcotc Estuary. Total adsorbed heavy-metal concentration (TAHM) in each site was shown to be highly correlated with mean sediment surface area. However, the relative contributions of sediment fractions to TAHM varied bimodally with decreasing particle size. In particular, the very fine silt and clay fractions showed less contribution to TAHM than coarser sediment grades including fine sand. This is because fine sediment particles tend to flocculate in saline conditions, thereby decreasing the effective adsorptive surface area of the sediments. This result implies that, paradoxically, cstuarinc sediments which consist predominantly of fine silts and clays may have fewer hcavymetal ions to contribute to the chemical environment of the estuary than coarser sediments. © Crown copyright 1989.

Full Text

Duke Authors

Cited Authors

  • Rodrigo, AG

Published Date

  • June 1, 1989

Published In

Volume / Issue

  • 23 / 2

Start / End Page

  • 255 - 262

Electronic International Standard Serial Number (EISSN)

  • 1175-8805

International Standard Serial Number (ISSN)

  • 0028-8330

Digital Object Identifier (DOI)

  • 10.1080/00288330.1989.9516362

Citation Source

  • Scopus