Table 2 Detection limit of receptor L1-L4 with nickel.

From: Naphthyridine derived colorimetric and fluorescent turn off sensors for Ni2+ in aqueous media

Receptor

Detection limit (3SB/S) M

Detection limit (Naked eye) M

Absorbance

Emission

L1

5.62 × 10−7

4.76 × 10−7

1 × 10−5

2

5.56 × 10−7

1.19 × 10−7

1 × 10−5

L3

3.88 × 10−7

6.61 × 10−8

1 × 10−5

L4

2.43 × 10−7

4.03 × 10−8

1 × 10−6