Authors: Ma, Hongrui; Wang, Xiaorong; Zhang, Chuanbo

Source: Chemical Speciation and Bioavailability, Volume 15, Number 1, February 2003 , pp. 15-22(8)

Publisher: Science Reviews 2000 Ltd

Abstract:

An investigation was carried out into the crop uptake of Cr(III) and its accumulation in two alkaline soils that have received tannery sludge as organic fertilizer for many years. The Cr(III) concentrations in the soils did not exceed the safe levels. However, Cr content in wheat and rice straw was up to 17 mg kg⁻¹ in recently sludge-applied soils, and Cr content in wheat grain exceeded the hygienic standard of China for food. After the sludge application, Cr(III) remained in top soil in the first few years and its transfer to a depth of 60 cm was discovered in the soils with application of the sludge for over 15 years. A sequential extraction procedure and seedling culture experiment were used to assess the Cr(III) chemical forms and their phytoavailability. The results showed that Cr in straw and wheat grain was significantly correlated with total Cr(III), H₂O-NH₄OAc and DPTA extractable Cr(III). 2 mol L⁻¹ HCl extractable Cr(III) was an important source of soil Cr available to the crops. In the seedling culture experiment, it was discovered that 1 mol L⁻¹ NH₄OAc and 0.05 mol L⁻¹ DPTA exhibited higher extraction capacities for Cr(III) than plant uptake at lower soil Cr(III) concentration, while they were coincident at higher Cr(III) concentration. Cr content in wheat seedlings reached a maximum of 23.5 mg kg⁻¹, which was hardly attainable under field conditions.

Keywords: Cr(III); alkaline soil; plant availability; tannery sludge

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422903782775262

Affiliations: 1: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, P.R. China

Publication date: 2003-02-10

More about this publication?

• Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.

  Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.

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