Table 2.

Retention time, concentration ranges of lineal response and correlation coefficient for standard organic acids

Organic acid standard	Rt (min)	Concentration ranges (ppm)	Equation	R2
Oxalic	3.884	1750–350	Y = 7585.1×-72,810	0.9937
Tartaric	4.148	5000–1000	Y = 2914.9×-2758	0.9942
Ascorbic	5.295	1750–350	Y = 8327.7×-7497.5	0.9921
Lactic	5.857	15,000–3000	Y = 769.58× + 4607	0.9939
Acetic	6.334	10,000–2000	Y = 253.82× + 2571	0.9991
Citric	6.953	10,000–2000	Y = 405.19× + 1826.9	0.9953
Succinic	9.052	10,000–2000	Y = 428.23× + 321.26	0.9936
Kojic	11.31	500–100	Y = 56,358×-22,343	0.9913