Detection method for impurity sodium salt in sodium hydrosulfide product

The invention relates to the technical field of an inorganic material, in particular to a detection method for an impurity sodium salt in a sodium hydrosulfide product. The detection method comprisesthe steps of (1) dissolving a sodium hydrosulfide sample in water to obtain a sample solution; (2) adding an excessive amount of barium sulfide solution into the sample solution, performing heat-preservation reaction until no precipitant is generated, performing solid-liquid separation, and washing a solid phase to obtain a first precipitant; (3) dropwise adding a hydrochloric acid solution into the first precipitant until the weight of the precipitant is not changed, performing solid-liquid separation, and washing a solid phase to obtain a second precipitant and a filtering liquid; and (4) transferring the second precipitant to a porcelain crucible ignited to constant weight, performing ignition to constant weight, calculating the content of impurity sodium sulfide in the sodium hydrosulfide product according to