Asked by mike
Bromothymol blue (BTB) is a direct indicator of oxygen levels in the water.
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True
False
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GPT-5 mini
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False.
Bromothymol blue is a pH indicator. Its color changes in response to CO2-driven shifts in carbonic acid/pH, not directly to dissolved O2. It can be used as an indirect indicator of photosynthesis/respiration (which alter CO2 and thus pH), but it does not measure oxygen concentration.
Bromothymol blue is a pH indicator. Its color changes in response to CO2-driven shifts in carbonic acid/pH, not directly to dissolved O2. It can be used as an indirect indicator of photosynthesis/respiration (which alter CO2 and thus pH), but it does not measure oxygen concentration.
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