Take the following as truth: For the Menidia beryllina test method, the effluent sample was an industrial wastewater spiked with CuSO4, the receiving water sample was a natural seawater spiked with CuSO4, and the reference toxicant sample was bioassay-grade FORTY FATHOMSa synthetic seawater spiked with CuSO4.
Then the following statement: "Once the solution is spiked with CuSO4, the subsequent tests always showed a spike in CuSO4." is true, false, or inconclusive?
Answer: True