Removal of Chromium from a Contaminated Soil Using Oxalic Acid, Citric Acid, and Hydrochloric Acid: Dynamics, Mechanisms, and Concomitant Removal of Non-Targeted Metals

International Journal of Environmental Research and Public Health
Yuhuan SunAnd Fayuan Wang

Abstract

Soil leaching is an effective remediation technique using agents to leach the target pollutants from the soil. However, the dynamics and mechanisms for leaching of Cr and other non-pollutant metals from Cr-contaminated soils are not yet well understood. Here, column leaching experiments were conducted to determine the effect of hydrochloric acid (HCl), citric acid (CA), and oxalic acid (OX) on the leaching of Cr, as well as of Ca, Mg, Fe, and Mn, from a soil contaminated by a Cr slag heap. Acid leaching decreased soil pH and enhanced the mobility of all the surveyed metals. Leaching dynamics varied with both metals and acids. OX had the highest removal rates for Cr, Fe, Mn, and Mg, but had the poorest ability to leach Ca. HCl leached the largest amount of Ca, while CA leached similar amounts of Mg and Mn to OX, and similar amounts of Fe and Cr to HCl. Cr in the leachates was correlated with Ca, Mg, Fe, and Mn. Cr mainly interacted with soil mineral components and showed a punctate distribution in soil particles. The X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and X-ray photoelectron spectroscopy (XPS) analyses showed soil mineralogical and morphological properties w...Continue Reading

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Citations

Aug 23, 2020·International Journal of Environmental Research and Public Health·Maja RadziemskaZbigniew Mazur
Dec 29, 2020·Journal of Environmental Management·Kingsley Eghonghon UkhureborIsrael Uzuazor Siloko
Feb 2, 2021·Journal of Hazardous Materials·Arumugam Arul PrakashShaban R M Sayed

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Methods Mentioned

BETA
column leaching
flame atomic absorption spectrometry
X-ray
acid leaching
dynamic
scanning

Software Mentioned

XPS Peak
Jade
SPSS
Excel

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