Method for detecting trace mercury and cadmium in water through ICP (inductively coupled plasma) extraction

The invention provides a method for detecting trace mercury and cadmium in water through ICP (inductively coupled plasma) extraction. The method comprises steps as follows: S1: a round-bottom centrifugal plastic pipe is prepared, and 10 mL of a sample solution with the pH being 7.0 is added to the round-bottom centrifugal plastic pipe; two drops of a neutral red indicating liquid are dropped, the solution is adjusted to be yellow with a color toner, a complexing agent and the sample solution are added and mixed sufficiently to form a hydrophobic ionic associate, and pH of the mixed solution is adjusted to 5.0 with a buffer solution after the mixture is uniformly shaken and left to stand; S2: 1 mL of an ammonium pyrrolidine dithiocarbamate solution and 1 mL of a Triton X-114 solution with the volume percentage being 20% are continuously added to the sample solution obtained in S2. In the technological procedure, technical features such as color adjustment, centrifugal shaking, temperature control and the like