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Data on adsorption/desorption shows that adsorption is not related to the organic content in soil, but rather a cation-exchange mechanism. For risk assessment the lowest Kd measured, 7.9 L/kg is used for partitioning to soil, and partitioning to solid phase in STP, sediment and suspended particles, is set to 0, in line with the EC Risk Assessment Report for piperazine.

From the vapour pressure 39 Pa at 22 °C and a water solubility of 150 g/L, a Henrys law constant of 0.022 Pa*m3/mol can be calculated, giving a partitioning coefficient between air-water of 9.3*10-6 . This implies that volatilisation from water is low.

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