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

Figure 6

Absorbency of various metals in contact with the dithizone-loaded test strip; shown are the responses from blank (MilliQ water), 20 mg/L of Hg²⁺, K⁺, Ca²⁺, Na⁺, Mn²⁺, Mg²⁺, Cu²⁺, Ag⁺, Ba²⁺, Al³⁺, Fe³⁺, Zn²⁺, PO₄³⁻, Cl⁻, and SO₄²⁻, and the concentration of other ions were one thousand times of Hg²⁺ (color-developing time: 2.5 min).