Total reduced sulfurs quartet (H(2)S, CH(3)SH, CH(3)SCH(3) [DMS]), CH(3)S(2)CH(3) [DMDS] is part of a spiny environmental problem afflicting the pulp mill industry exploiting the Kraft sulfate pulp process. Utilization of the ferric chelate complex of trans-1,2-cyclohexanediaminetetraacetic acid (CDTA) for the oxidative scrubbing of H(2)S and CH(3)SH in the Kraft mill atmospheric effluent streams is beneficial from the standpoints of iron protection against precipitation and oxygen-mediated regenerative oxidation of ferrous chelate CDTA. The remaining DMS and DMDS, considered non-oxidizable in CDTA-Fe(III) aqueous alkaline solutions, undergo physical absorption so their solubility is a crucial parameter for the design of the scrubbing- absorption process. The solubility of DMS in pure water, aqueous iron-free CDTA solutions, and CDTA-Fe(II) complex solutions was measured at atmospheric pressure between (288 and 308) K and for chelate concentrations between (38 and 300) mol center dot m(-3). As experimental results revealed that DMS destabilized ferrous chelates at very large CDTA-Fe(II) concentrations, a maximum chelate concentration presenting practical interest was established. The static headspace method was used with an estimated uncertainty of +/- 2 %. It was shown that DMS solubility decreases with increasing temperature for all systems studied. CDTA concentration does not considerably affect DMS solubility; moreover, the concentration effect is negligible at 308 K. The solution pH was uninfluential. on DMS solubility over the covered concentration and temperature ranges. CDTA concentration less than 100 mol center dot m(-3) is recommended for use in absorption scrubbing equipments.