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Endpoint summary

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Assessment of this endpoint and derivation of adsorption coefficients are element-based (i.e., not substance-based). A total of five studies was used in a weight of evidence approach to cover the endpoint. Reliable data were available for soil, suspended matter, and sediment. The following final key values were retained: a log Kp of 5.00 for suspended matter-water, a log Kp of 5.47 for sediment-water, and a log Kp of 4.13 for soil-water. Adsorption of zirconium to sediment and suspended matter appears to be slightly more pronounced than for soil.