氯化镧溶液用于各种水处理应用。它也用于生化研究。掺铈后，用作闪烁体材料。在有机合成中，三氯化镧是一种温和的路易斯酸。这种化合物用于伽马探测器。 Lanthanum chloride solutions are used in various water treatment applications. It is also used in biochemical research. Doped with cerium, it is applied as a scintillator material. In organic synthesis, lanthanum trichloride functions as a mild lewis acid. This compound is used in gamma detectors.