Relaxation wavelength decrement values for various ions in water

Cation	δλ- (±2) x 10-4m	Anion	<δλ- (±2) x 10-4
H+	+4	OH-	-2
Li+	-3	Cl-	-4
Na+	-4	F-	-4
K+	-4	SO42-	-11
Mg2+	-4	I-	-15
Pethig pg. 142