Lee, W Batchelor, B 2024-01-21T09:37:03Z 2024-01-21T09:37:03Z 2021-09-01 2002-12-01 0013-936X https://pubs.kist.re.kr/handle/201004/138968 Abiotic reductive dechlorination of chlorinated ethylenes (tetra chloroethylene (PCE), trichloroethylene (TCE), cis-dichloroethylene (cis-DCE), and vinyl chloride (VC)) by pyrite and magnetite was characterized in a batch reactor system. Dechlorination kinetics was adequately described by a modified Langmuir-Hinshelwood model that includes the effect of a decreasing reductive capacity of soil mineral. The kinetic rate constant for the reductive dechlorination of target organics at reactive sites of soil minerals was in the range of 0.185 (+/-0.023) to 1.71 (+/-0.06) day(-1). The calculated specific reductive capacity of soil minerals for target organics was in the range of 0.33 (+/-0.02) to 2.26 (+/-0.06) muM/g and sorption coefficient was in the range of 0.187 (+/-0.006) to 0.7 (+/-0.022) mM(-1). Surface area-normalized pseudo-first-order initial rate constants for target organics by pyrite were found to be 23.5 to 40.3 times greater than those by magnetite. Target organics were mainly transformed to acetylene and small amount of chlorinated intermediates, which suggests that beta-elimination was the main dechlorination pathway, The dechlorination of VC followed a hydrogenolysis pathway to produce ethylene and ethane. The addition of Fe(II) increased the dechlorination rate of cis-DCE and VC in magnetite suspension by nearly a factor of 10. The results obtained in this research provide basic knowledge to better predict the fate of chlorinated ethylenes and to understand the potential of abiotic processes in natural attenuation. English AMER CHEMICAL SOC HENRYS LAW CONSTANTS CARBON-TETRACHLORIDE AQUEOUS-SOLUTION SUBSTITUTED NITROBENZENES TRANSFORMATION TETRACHLOROETHYLENE SULFIDE TRICHLOROETHYLENE DEHALOGENATION VITAMIN-B-12 Abiotic reductive dechlorination of chlorinated ethylenes by iron-bearing soil minerals. 1. Pyrite and magnetite Article 10.1021/es025836b 1 ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.36, no.23, pp.5147 - 5154 ENVIRONMENTAL SCIENCE & TECHNOLOGY 36 23 5147 5154 scie scopus 000179685000033 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article HENRYS LAW CONSTANTS CARBON-TETRACHLORIDE AQUEOUS-SOLUTION SUBSTITUTED NITROBENZENES TRANSFORMATION TETRACHLOROETHYLENE SULFIDE TRICHLOROETHYLENE DEHALOGENATION VITAMIN-B-12 Reductive dechlorination