Table 1.

Repeatability of the carbon deposition process

	Batch 1	Batch 2	Batch 3	Average	%RSD
%C (w/w) a	31.6	29.5	30.7	30.6	3
Plate count/m b	45,800	46,300	52,400	48,200	8
Symmetry c	0.6	0.6	0.6	0.6	3
k of nitrohexane d	5.9	4.9	4.9	5.2	11
k of toluene e	1.3	1.4	1.5	1.4	7
k of nitrobenzene e	4.9	3.9	4.7	4.5	12

^a16 h CVD at 700 °C with hexane as source.

^bPlate count from nitrohexane.

^cSymmetry based on nitrohexane, LC conditions: F = 0.4 ml/min., T = 40 °C,

^d35/65 MeCN/water,

^e50/50 MeCN/water; All packed in 33 × 2.1 mm id. column.