Dechlorination of Hexachloroethane in Water Using Iron Shavings and Amended Iron Shavings: Kinetics and Pathways

Table 2

Reaction pathways, kinetics for HCA reduction by Fe⁰ (shavings), Cu/Fe, Ag/Fe, and Pd/Fe.

Iron shavings	Pathway	𝐾𝑛 values	Equations for each substance
Fe^0 (shavings)		𝐾1=1.098 h^−1	[HCA]=50𝑒^−1.098𝑡
			[PCE]=50(1−𝑒^−1.098𝑡)
Cu/Fe		𝐾1=2.044h^−1	[HCA]=50𝑒^−2.044𝑡
			[PCE]=50(1−𝑒^−2.044𝑡)
Ag/Fe		𝐾1=2.842h^−1	[HCA]=50𝑒^−2.842𝑡
		𝐾2=1.251h^−1	[PCE]=89(𝑒^−1.251𝑡−𝑒^−2.842𝑡)
		𝐾3=0.149h^−1	[TCE]=47𝑒^−2.842𝑡−142𝑒^−1.251𝑡+95𝑒^−0.463𝑡
		𝐾4=0.314h^−1	[𝑡𝑟𝑎𝑛𝑠-DCE]=0.323(50−8𝑒^−2.842𝑡+53𝑒^−1.251𝑡−95𝑒^−0.463𝑡)
			[𝑐𝑖𝑠-DCE]=0.677(50−8𝑒^−2.842𝑡+53𝑒^−1.251𝑡−95𝑒^−0.463𝑡)
Pd/Fe		𝐾1=1.267h^−1	[HCA]=50𝑒^−1.267𝑡
		𝐾2=0.978h^−1	[PCE]=219(𝑒^−0.978𝑡−𝑒^−1.267𝑡)
		𝐾3=1.41h^−1	[TCE]=−1500𝑒^−1.267𝑡+496𝑒^−0.978𝑡+1004𝑒^−1.41𝑡
			[C2H4]=50+1669𝑒^−1.267𝑡−715𝑒^−0.978𝑡−1004𝑒^−1.41𝑡