Ferric iron titration test paper in nickel electrolysis system solution

The invention discloses a piece of ferric iron titration test paper in a nickel electrolysis system solution. The ferric iron titration test paper comprises a test strip and a standard color card. Inaddition, the preparation method of the test strip includes: immersing medium-speed filter paper in a potassium thiocyanate standard reagent solution with the mass percentage of 20% to 25% for 10 to 15min until the complete immersion, carrying out drying naturally, carrying out cutting to obtain a test strip, and then carrying out plastic sealing bookbinding. The method for preparing a standard color card includes: analyzing total iron concentrations in different concentrations of iron-containing solutions by testing, fully oxidizing the iron-containing solutions, carrying out titration by using a potassium thiocyanate standard reagent solution with the mass percentage of 20% to 25% after oxidation to determine the colors in the different concentrations of iron-containing solutions, and then carrying our color arr