ROLE OF MANGANESE IN THE OXIDATION OF ARSENITE BY FRESHWATER LAKE SEDIMENTS

  • Oscarson D
  • Huang P
  • Liaw W
  • 19

    Readers

    Mendeley users who have this article in their library.
  • 80

    Citations

    Citations of this article.

Abstract

The importance of various sediment components in the oxidation of As(III) (arsenite) to As(V) (arsenate) by freshwater lake sediments in southern Saskatchewan was examined. Treating the sediments with hydroxylamine hydrochloride or sodium acetate to remove Mn greatly decreased the oxidation of As(III). Furthermore, synthetic Mn(IV) oxide was a very effective oxidant with respect to As(liD: 216 t~g As(V)/ml was formed in solution when 1000 txg As(III)/ml was added to suspensions of 0.1 g of the oxide. These results indicate that Mn in the sediment was probably the primary electron acceptor in the oxidation of As(III). The conversion of As(III) to As(V) by naturally occurring carbonate and silicate minerals common in sediments was not evident in the system studied. Sediment particles >20 ~.m in size are the least effective in oxidizing As(III); the oxidizing ability of the 5-20-, 2-5-, and

Author-supplied keywords

  • ---arsenic
  • lake sediments
  • manganese
  • oxidation

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

  • D W Oscarson

  • P M Huang

  • W K Liaw

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free