Kinetics of Chromium Reduction Associated with Varying Characteristics of Agricultural Soils

Abstract

Chromium (Cr)(VI) is carcinogenic; thus, the excessive presence of Cr(VI) in soils can pose potential risks to water quality, food safety, and human health. The kinetics of Cr(VI) reduction in soils are important for assessing the fate of Cr in the environment. The present study tested physio-chemical and microbial properties in twenty-eight agricultural soils collected in Taiwan to evaluate the relationship between the reduction rate of Cr(VI) and soil properties, using 49-day incubation at 25 °C. At the beginning of incubation, 100 mg Cr(VI) kg−1 was spiked into the soils. The reduction of Cr(VI) was described by first-order kinetics at a significant level (p < 0.05) for the tested soils. The rate constant (k) of Cr(VI) reduction ranged from 0.01 to 4.21 day−1. In addition, the k value significantly increased with organic carbon (OC) and cation exchange capacity, but significantly decreased with increasing pH and dithionite-citrate-bicarbonate extractable Mn (Mnd). However, a predictive model using stepwise regression analysis indicated that the k value of the kinetics was controlled by OC, dissolved organic carbon (DOC), and Mnd, thereby identifying the complex interactions between Cr(VI) reduction and soil factors in the humid tropics.

Insight into chromium adsorption from contaminated soil using Mg/Al LDH-zeolite

“…The study's findings align with previous research, indicating the complexity and intricacy of soil chemistry and its influence on heavy metal speciation and mobility. This result is correlated with the fact that the diminution of Cr(VI) followed the first-order kinetics at a significant level for the examined soils, and the reduction efficiency certainly depends on the external factors, including organic matter content, the initial added chromium concentration and pH condition of soil [ 35 ]. The increase in the e-Cr form at low pH of acidic medium may be ascribed to the existence of ferric ion that enhances the reduction rate of Cr(VI), even at a trace amount of added Fe(III) in the system [ 36 ].…”