Development of Cellulosic Paper-Based Test Strips for Mercury(II) Determination in Aqueous Solution

Figure 3

Different images of dipping-in method and dropping-on method: (a) the linear relationship between absorbency value and different dipping time of test strip and Hg²⁺ by dipping-in method and (b) test strip with marker circle and mercury-dithizone colored complexes forming by dropping-on method.

(a)

(b)