Table 1.

Stepwise Chromium Reduction in a Single Production Batch Quantified by MP-AES Hold-Back Measurements

	Cr mass (μg)	step separation factor	cumulative separation factor
dissolved target	(4.05 ± 0.04) × 103	-	-
after col. #1	360 ± 18	601 ± 31	(6.0 ± 0.3) × 102
after col. #2	3.82 ± 0.19	80 ± 6	(4.8 ± 0.4) × 104
after col. #3	0.083 ± 0.008	42 ± 5	(2.0 ± 0.3) × 106