ISO 11348 describes three methods for determining the inhibition of the luminescence emitted by the marine bacterium Vibrio fischeri (NRRL B‑11177). ISO 11348-2:2007 specifies a method using liquid‑dried bacteria.

This method is applicable to:

• waste water;
• aqueous extracts and leachates;
• fresh water (surface water and ground water);
• sea water and brackish water;
• eluates of sediment (fresh water, brackish water and sea water);
• pore water;
• single substances, diluted in water.