ISO 11348 describes three methods for determining the inhibition of the luminescence emitted by the marine bacterium Vibrio fischeri (NRRL B‑11177). ISO 11348-1:2007 specifies a method using freshly prepared bacteria. This method is applicable to: waste water; aqueous extracts and leachates; fresh water (surface and ground water); sea and brackish water; eluates of sediment (fresh water, brackish and sea water); pore water; single substances, diluted in water.