Concentration (ng/mL) 0.04 0.1 0.2 0.4 0.8 1.6  
peak area standard solution 5178 13941 26410 54303 107938 214381
(u V.S) tested            
  control solution 5571 14405 25876 52716 106399 219319
Table 5: Stability of ameziniummetilsulfate (AM) standard solution