Preparation method and application of sol test paper for greenly and rapidly detecting sulfur ions

The invention discloses a preparation method of sol test paper for greenly and rapidly detecting sulfur ions, and relates to the technical field of trace sulfur ion measurement. The preparation methodcomprises preparation of CMC/AgNPs sol and the sol test paper, wherein the CMC/AgNPs sol is prepared by taking sodium carboxymethylcellulose (CMC) and a silver-ammonia complex as raw materials through an in-situ redox reaction method. The invention further discloses a method for preparing the sol test paper through coating the sol on test paper and an application of the sol test paper in the aspect of semi-quantitatively detecting S2- concentrations. The preparation method and application have the beneficial effects that the environment-friendly natural high polymer material CMC and inorganicsilver are utilized as raw materials for preparing the sol; and the prepared sol and sol test paper have high selectivity for S2-, cannot be interfered by other ions, have high sensitivity and a detection limit reaching a mic