Research Article

Quality-by-Design Principles Applied to the Establishment of a Pharmaceutical Quality Control Laboratory in a Resource-Limited Setting: The Lab Water

Figure 5

Control chart (six-sigma limits) indicating the trend of HPLC global peak area (a) at 210 nm and (b) 254 nm of fresh lab water (18.2 MΩ × cm at 25°C) over time (n = 49 days/year). UCL: upper control limit; LCL: lower control limit.
(a)
(b)