. 2021 Dec 29;7(1):1288–1298. doi: 10.1021/acsomega.1c05899

Table 4. The Tolerance Concentration for Interfering Matrix Species during Detection of [0.2 Ppm] Fe(III) Ions Using the 3-fsa-MSNT and 5-fsa-MSNT Sensors.

		tolerance limit for foreign ions (ppm)
sensor	specific pH	Fe²⁺	Mg²⁺	Ca²⁺	Ba²⁺	Co²⁺	Ni²⁺	Zn²⁺	Cu²⁺	Pb²⁺	Hg²⁺	Cd²⁺	Cl^–	NO₃^–	SO₄^2–
3-fsa-MSNTs	4	10	500	500	500	20	20	20	5^a	50	50	50	500	500	100
5-fsa-MSNTs	2	10	500	500	500	20	20	20	10^a	50	50	50	500	500	100

Ion-sensing system with addition of masking agent of 0.1 M sodium citrate.