Arsenic survival and LC50 values are not safe aquarium limits

The evidence library is allowed to change in public. This page preserves the revised boundary, why it moved and which guides were affected.

What changed

The chemical-exposure backlog now includes two related 1993 and 1994 Neocaridina arsenic food-chain experiments while keeping their abstract-level survival, tolerance, accumulation, excretion and trophic-transfer results out of the evidence corpus until complete methods are reviewed.

Why it changed

One abstract reports four arsenic-species LC50 values; the other says shrimp survived below 2 mg/L arsenate and separates aqueous from dietary arsenic profiles. Both omit essential duration, animal, vessel, replication, measured-exposure, analytical, feeding and statistical units. The related papers share authors and program logic and are not independent laboratory replications. Neither an LC50 nor unspecified survival below a concentration is a safe limit.

Sources reviewed for this change

Affected practical guides

A public change is not automatically a retraction. A source may be added, a scope narrowed, a gap refined or an error corrected. The current guide and registry record own the current wording.

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