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Int. J. Environ. Res. Public Health 2017, 14(5), 532; doi:10.3390/ijerph14050532

Influence of Nano-Hydroxyapatite on the Metal Bioavailability, Plant Metal Accumulation and Root Exudates of Ryegrass for Phytoremediation in Lead-Polluted Soil

1
College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China
2
Environmental Engineering Program, University of Northern British Columbia, Prince George, BC V2N4Z9, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Susanne Charlesworth
Received: 11 December 2016 / Revised: 25 April 2017 / Accepted: 25 April 2017 / Published: 16 May 2017
(This article belongs to the Special Issue Heavy Metals: Environmental and Human Health)
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Abstract

Lead is recognized as one of the most widespread toxic metal contaminants and pervasive environmental health concerns in the environment. In this paper, the effects of nano-hydroxyapatite (NHAP) on remediation in artificially Pb-contaminated soils and ryegrass were studied in a pot experiment. The addition of NHAP decreased the water- and acid-soluble, exchangeable, and reducible fractions of Pb, extracted using the Community Bureau of Reference (BCR) method, whilst greatly increasing the residual fraction of Pb. Oxidizable Pb was increased slightly. No significant increase in soil pH was caused by the application of NHAP. Compared to conditions without NHAP, the addition of NHAP decreased the Pb content in ryegrass shoots and roots by 13.19–20.3% and 2.86–21.1%, respectively. Therefore, the application of NHAP reduced the mobility and bioavailability of Pb in the soil. In addition, the application of NHAP improved the fresh weight of shoots and roots, and promoted the growth of ryegrass. NHAP played a positive role in stimulating ryegrass to secrete tartaric acid. View Full-Text
Keywords: nano-hydroxyapatite; ryegrass; Pb-polluted soil nano-hydroxyapatite; ryegrass; Pb-polluted soil
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Ding, L.; Li, J.; Liu, W.; Zuo, Q.; Liang, S.-X. Influence of Nano-Hydroxyapatite on the Metal Bioavailability, Plant Metal Accumulation and Root Exudates of Ryegrass for Phytoremediation in Lead-Polluted Soil. Int. J. Environ. Res. Public Health 2017, 14, 532.

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