Described is an agrochemical isotropic dispersion of at least two immiscible liquids comprising at least one water soluble herbicidal salt; a surfactant system comprising a sorbitan ester or an alkoxylate thereof in combination with at least one vegetable oil alkoxylate; and water and a process for the preparation thereof, also described is an agrochemical microemulsion formulation comprising the isotropic dispersion and a method for controlling a weed at a desired location comprising applying the microemulsion formulation.