Temperature dependent Henry’s law constant for technical toxaphene

Abstract

Toxaphene is an abundant organochlorine (OC) pesticide in Great Lakes and Arctic ecosystems and the Henry's Law constant (HLC, Pa m³/mol) is a critical factor in describing its gas exchange between air and water. The HLCs for technical toxaphene and two hexachlorocyclohexane (HCHs) isomers (α- and γ-HCH) were determined by the gas stripping method over a temperature range of 10–40°C. The relationship to temperature (K) was described by $\text{log}\text{H=m/T+b}$. Parameters of this equation were: toxaphene m=−3209, b=10.42; α-HCH m=−3298, b=10.88; γ-HCH m=−3005 and b=9.51. The HLCs (Pa m³/mol) at 293.15 K were: toxaphene=0.30, α-HCH=0.43 and γ-HCH=0.18.