acetonitrile (anhydrous,≥99.8%), Methanol (anhydrous,≥99.8%),and the reference standards, GC grades (>99.0%), also were obtained from Sigma–Aldrich (Malaysia)
acetonitrile (anhydrous,≥99.8%), Methanol (anhydrous,≥99.8%),and the reference standards, GC grades (>99.0%), also were obtained from Sigma–Aldrich (Malaysia)