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EC number: 267-956-0
CAS number: 67953-76-8
The substance is not readily biodegradable, based on the results of the
The ready biodegradability study using HEDP acid was selected as the key
study (Handley & Mead, 1992). This study followed the 5 day Biological
Oxygen Demand (BOD5) method (similar to OECD 301). The study is
considered to be a reliable study to demonstrate that the substance is
not readily biodegradable.
A very large number of supporting studies are available for the acid
form and for the sodium salt of HEDP associated with WWTP simulation,
aerobic and anaerobic studies using radiolabelling etc. The potassium
salt can be expected to have equivalent properties. All of the available
evidence supports a lack of biodegradability even where pre-adapted
inoculum is used, though in some cases removal from the system by
adsorption processes has occurred.
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