Developing the relationship between metal ionic characters and ecological risk assessment screening values using QICAR

Environmental Science and Pollution Research International
Zhitao LiXuedong Wang

Abstract

Metals are widely released and distributed in soil and may have a negative impact on terrestrial organisms. Over the past years, a series of criteria or standards for assessing the ecological risks and toxicity of metals have been published in many countries; however, few studies have investigated their metal ionic properties and toxicity. In the present study, the ecological risk assessment screening values (ERASV) recommended by the Oregon Department of Environmental Quality were selected to investigate the correlation between metal toxicity and their ionic characters based on the hard and soft acids and bases (HSAB) concept. The results showed that more ionic characters were significantly correlated with ERASV using the HSAB theory, while only one metal ionic characteristic was correlated with ERASV in organisms. For borderline metal ions, maximum complex stability constants (log βn) and the softness (δp) of borderline ions were correlated with ERASV, while log βn and electronegativity (Xm) were significantly related to ERASV for borderline plus hard ions, and the boiling point (BP) and electron density (AR/AW) (AR indicates atomic radius and AW is atomic mass) were significantly related to ERASV for borderline plus soft ion...Continue Reading

References

Nov 20, 2001·The Science of the Total Environment·H T Wolterbeek, T G Verburg
Aug 20, 2003·Environmental Toxicology and Chemistry·John D WalkerJohn C Dearden
Mar 8, 2011·Ecotoxicology and Environmental Safety·Dong-Mei ZhouDan-Dan Li
Apr 27, 2017·Scientific Reports·Valentina CappelloMauro Gemmi

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