In analytical chemistry, tetrabutylammonium dihydrogen phosphate is a substance that is employed. When combined with p-hydroxybenzoic acid, it creates stable compounds that make polymerase chain reaction an analytical tool possible. This chemical's methyl ethyl ester has been employed as an analytical technique to find sodium salts. Due to its characteristics as a receptor molecule and a fluorescence detector, this chemical compound can also be employed in chemotherapy treatment. It has been utilized in the mobile phase as an ion-pairing reagent.