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EC number: 231-511-9 | CAS number: 7601-89-0
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
The test is not scientifically justified as Sodium Perchlorate is inorganic.
Key value for chemical safety assessment
Additional information
The presented study examined the effect of biodegradation on perchlorate fate and transport in soils. Solute transport experiments were conducted on two surface soils. Pulses of solution containing perchlorate and Br- were applied to saturated soil columns at steady state water flow. Perchlorate behaved like a nonreaclive tracer in Columbia loam (coarse-loamy, mixed, superactive, nonacid, thermic Oxyaquic Xerofluvent) but was degraded in Yolo loam (fine-silty, mixed, super-active, nonacid, thermie Mollic Xerofluvent). Batch experiments demonstrated that perchlorate removal from solution in Yolo loam was caused by biodegradation. Other batch experiments with Yolo loam surface and subsurface soils, Columbia loam surface soil, and dredge tailings demonstrated that perchlorate biodegradation required anaerobic conditions, an adequate carbon source, and an active perchloratedegrading microbial population. The sequential reduction of perchlorate and NO3- by an indigenous soil microbial community in Yololoam batch systems was also studied. Nitrate reduction occurred much sooner thon perchlorate reduction in soils that had not been previously exposed to perchlorate, but nitrates, and perchlorate were simultaneously reduced in soils previously exposed to perchlorate.
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