Use of the Relaxometry Technique for Quantification of Paramagnetic Ions in Aqueous Solutions and a Comparison with Other Analytical Methods

Table 1

Validation parameters for relaxometry and spectrophotometry techniques.

	Ion	LOD (mol L^−1)	LOQ (mol L^−1)	Sensitivity	Linearity range (mol L^−1)
Spinlock	Ni^2+			572 ± 3	to
	Cu^2+			1401 ± 8	to
	Cr^3+			7370 ± 158	to
	Mn^2+			31487 ± 282	to
UNMR	Ni^2+			632 ± 4	to
	Cu^2+			1141 ± 8	to
	Cr^3+			9470 ± 130	to
	Mn^2+			28517 ± 294	to
SP	Ni^2+			5.01 ± 0.01	to
	Cu^2+			12.46 ± 0.04	to
	Cr^3+			16.28 ± 0.29	to

Mean ± SD (); s⁻¹ mol⁻¹ L; cm⁻¹ mol⁻¹ L.