More samplesweretoxicusingthechronicendpointcomparedto
the acuteendpointillustratingtheneedforfurthertestingwith
additional sedimentcontacttestswithchronicendpoint,although
there iscurrentlynotawidechoice. Hyalellaazteca has beenused
in severalstudiesbutthisspeciesisincontrastto H. congruens not
present inEuropeanfreshwaterecosystems.Alternativetest
organisms forwhichinternationallyacceptedtestmethodshave
been developedandusedforsedimenttoxicitytestingare
Lumbriculusvariegatus or Chironomusriparius (Egeleretal.,2010).
A majoradvantageofusing H. incongruens in theOstracodtoxkitF™
is thatthetestorganismsarehatchedfromcystsavoidingmain-
tenanceofin-housestockcultures.Eventhoughithasnotyet
reachedinternationalstandardization,aninternationalintercalibra-
tioncomparisonhasrecentlybeenconductedinpreparationforISO
standardizationofthetestmethod(JanssenandPersoone,2010