Accessory minerals and potentially toxic elements in Tanzanian vermiculites with respect to agricultural applications

E Marwa, Clive M. Rice, Andrew A. Meharg

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The study assessed accessory minerals and metals in Tanzanian vermiculites with respect to their potential suitability for agricultural applications. Mineral and chemical analyses were involved. Pot experiments were also conducted to assess plant uptake of metals from soil with vermiculites. Fibrous sepiolite and amphiboles were minerals of health concern found in some samples. The sepiolite fibers had aspect ratios similar to those of asbestos minerals, which cause respiratory disorders and lung cancer when inhaled and thus pose a potential health risk to animals and humans. The amphibole fibers were thicker than 10 µm and are unlikely to be inhaled. Chromium (Cr) and nickel (Ni) concentrations in some samples were greater than the limits permitted in agricultural soils, but the elements are not highly plant available and do not inhibit the uptake of essential macronutrients. Heating vermiculites at 400-600 °C enhanced extractability of Cr and Ni and should preferably be avoided.
Original languageEnglish
Pages (from-to)1123-1142
Number of pages20
JournalCommunications in Soil Science and Plant Analysis
Volume42
Issue number10
DOIs
Publication statusPublished - 2011

Fingerprint

agricultural application
accessory mineral
sepiolite
minerals
amphibole
chromium
nickel
mineral
metal
metals
asbestos
agricultural soil
health risk
cancer
lung neoplasms
agricultural soils
respiratory tract diseases
heating
animal
heat

Keywords

  • amphiboles
  • metals
  • sepiolite
  • Tanzania
  • vermiculite
  • chromium accumulation
  • higher-plants
  • soil
  • copper
  • zinc
  • nickel
  • health
  • environment
  • asbestos

Cite this

Accessory minerals and potentially toxic elements in Tanzanian vermiculites with respect to agricultural applications. / Marwa, E; Rice, Clive M.; Meharg, Andrew A.

In: Communications in Soil Science and Plant Analysis, Vol. 42, No. 10, 2011, p. 1123-1142.

Research output: Contribution to journalArticle

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