In this study the gas-liquid partitioning behaviors of the dissolved gas tracers, krypton and sulfur hexafluoride were examined. Although these dissolved gas groundwater tracers offer advantages over conventional tracers such as dissolved salts and dyes due to their innocuous nature, their utilization has been limited largely due to concerns about partitioning to trapped gas phases during transport.|Dissolved gases did not behave conservatively in column or field deployments in less than saturated conditions. However, the manner in which transport was retarded was predictable and occurred primarily as a function of the Henry's Law constant of the dissolved gas tracer. When used in conjunction with a conservative tracer such as tritium (3H) the deviation from conservative behavior was used to predict the volume of unsaturated space in partially saturated porous media.