Table 2.

Comparison of H₂ photoproduction characteristics in C. reinhardtii between one step method and stepwise mode.

NaHSO3 addition	Vmax (μmol H2 mg Chl-1h-1)1	Amax (relative; %)2	Time (day)3
One step method	11.8 ± 0.7	100 ± 6.9	50.2 ± 3.2
Stepwise mode	14.7 ± 1.2	145.6 ± 5.1	76.1 ± 2.8

¹Vmax indicates the maximum velocity of H₂ photoproduction. ²Amax indicates the maximum accumulated H₂ (calculated from Figure 1A) and its value in one step method was taken as 100%. ³Time represents the time of continuous H₂ production, which was calculated from Figure 1A.