Table 3 Matrix of CCD experiments and corresponding results.

Variables affecting the response	Response result
Test	Reaction time (min)	pH	[Cr₂O₇²⁻] (mM)	[HCOONa] (M)	% Production efficiency of Cr (III)
1	200.50	2.75	5.05	0.950	2.47
2	100.75	3.88	7.525	0.525	0.11
3	300.25	1.63	7.525	0.525	22.46
4	300.25	3.88	2.575	1.375	0.31
5	300.25	3.88	2.575	0.525	0.31
6	200.50	2.75	10.00	0.950	1.25
7	300.25	3.88	7.525	1.375	0.11
8	100.75	1.63	7.525	1.375	8.70
9	300.25	1.63	2.575	1.375	65.63
10	200.50	2.75	5.050	0.95	2.46
11	300.25	1.63	7.525	1.375	20.27
12	200.50	2.75	5.050	0.950	2.48
13	200.50	2.75	5.050	0.950	2.48
14	200.50	2.75	0.100	0.950	53.00
15	100.75	1.63	2.575	0.525	10.50
16	1.00	2.75	5.050	0.950	0.63
17	200.50	2.75	5.050	0.950	2.48
18	200.50	2.75	5.050	0.950	2.48
19	100.75	3.88	2.575	0.525	0.31
20	300.25	1.63	2.575	0.525	24.27
21	100.75	3.88	2.575	1.375	0.31
22	200.50	5.00	5.050	0.950	0.00
23	200.50	2.75	5.050	0.100	2.41
24	300.25	3.88	7.525	0.525	0.11
25	200.50	0.50	5.050	0.950	76.83
26	100.75	3.88	7.525	1.375	0.11
27	100.75	1.63	7.525	0.525	22.46
28	200.50	2.75	5.050	1.800	2.50
29	400.00	2.75	5.050	0.950	2.48
30	100.75	1.63	2.575	1.375	23.11

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