Table 1.

Probing of Hg²⁺ ion in actual water samples (river, lake, and well water) spiked with various concentrations of Hg²⁺ ion by the designed paper sensor

Sample	Amount added [× 10−6 m]	Amount found [× 10−6 m]	Recovery [%]	RSD [n = 3, %]
Well water
1	20	20.5	102.5	2.45
2	50	51.5	103	1.14
3	100	113.31	113.31	4.28
River water
1	20	16.8	84	0.57
2	50	45.9	91.8	4.1
3	100	96.4	96.4	9.64
Lake water
1	20	17.7	88.5	3.52
2	50	50.7	101.4	0.48
3	100	89.10	89.1	2.72