TABLE 2.

Leaked nickel ion concentration depending on consecutive method runs without protein load after a strip and recharge of the IMAC column (n = 3).

Method runs	Ni2+ concentration
	(µM)
1	8.8 ± 1.6
2	8.0 ± 0.6
3	6.7 ± 0.2
4	5.3 ± 0.2
5	4.3 ± 0.2
6	4.2 ± 0.2