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What does BTB mean?
It is bromothymol blue, which is an acid-base indicator and an adsorption indicator. ?

Bromthymol blue, also known as bromothymol blue, is often used as a respiratory reagent for aquatic organisms in biological experiments.

Light rose crystalline powder, melting point 200~202℃, easily soluble in ethanol, ether, methanol and dilute alkali hydroxide solution. Slightly soluble in benzene, toluene and xylene, slightly soluble in water and almost insoluble in petroleum ether. It is blue in alkaline solution and yellow in acidic solution.

Extended data:

English example of BTB:

1, Methods: A method for the determination of chlorpromazine hydrochloride in compound metamizole enema was established with bromothymol blue as counter ion and toluene as extraction solvent.

METHODS:? The? extraction? spectrophotometry? with? bromothymol? blueas? counter? ion? had? been? established? for? the? measurement? ofchlorpromazine? hydrochloride.

2. Use bromothymol blue to identify the sex of plants.

Plant? sex? determination? by? bromothymol? blue? test .

3. Determination of pKa of bromothymol blue.

Determination? of? the? pKa? on? bromthymol? bl.

References:

Bromthymol Blue _ Baidu Encyclopedia