AZOMETHINE-H MONOSODIUM SALT HYDRATE AR
(Reagent for the determination of boron)
4-Hydroxy-5-(2-hydroxybenzylideneamino)-naphthalene-2,7-disulfonic acid monosodium salt hydrate; 4-Hydroxy-5-(salicylideneamino)-2,7-naphthalenedisulfonic acid monosodium salt