Yang C.-YTseng Y.-LZENG-YEI HSEU2022-12-142022-12-14202220734441https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124708188&doi=10.3390%2fw14040570&partnerID=40&md5=5d5d629bcc4ee7e7c5e071547ab6a914https://scholars.lib.ntu.edu.tw/handle/123456789/626092Chromium (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. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.First-order kinetics; Heavy metal; Soil contamination; Speciation of chromium[SDGs]SDG3[SDGs]SDG11Agriculture; Chromium compounds; Health risks; Heavy metals; Kinetics; Organic carbon; Rate constants; Regression analysis; Soil pollution; Water quality; % reductions; Agricultural soils; Carcinogenics; Chromium reduction; Chromium VI; First order kinetics; k-Value; K-values; Soil contamination; Speciation of chromium; Soils; agricultural science; agricultural soil; chromium; dissolved organic carbon; reaction kinetics; reduction; soil chemistry; soil propertyjournal article10.3390/w140405702-s2.0-85124708188