2.4. Gas chromatography-flame ionization detector analysis
An Agilent 7980A gas chromatograph equipped with a flame
ionization detector (Agilent Technologies, China) was used for
sample quantification. Samples of 1 mL were injected and
separated using a HP-5 capillary column (30 m length 0.32 mm
mm id 0.25 mm film thickness). The column was kept at 100 8C
for 1 min, increasing to 260 8C at a rate of 20 8C min1 and held for
3 min [10]. A split ratio of 25 to 1 with a carrier gas (high-puritygrade
helium) flow rate of 1.0 mL min1 was used. The flow rate of
fuel (hydrogen), oxidant (air zero), and make-up gas were 30, 300,
and 25 mL min1, respectively. The inlet and detector were kept at
260 8C and 275 8C, respectively. The instrument was calibrated for
methamphetamine in the range of 0.0025–2 mg mL1 where n = 6
for each calibration standard injected.
2.4. Gas chromatography-flame ionization detector analysis
An Agilent 7980A gas chromatograph equipped with a flame
ionization detector (Agilent Technologies, China) was used for
sample quantification. Samples of 1 mL were injected and
separated using a HP-5 capillary column (30 m length 0.32 mm
mm id 0.25 mm film thickness). The column was kept at 100 8C
for 1 min, increasing to 260 8C at a rate of 20 8C min1 and held for
3 min [10]. A split ratio of 25 to 1 with a carrier gas (high-puritygrade
helium) flow rate of 1.0 mL min1 was used. The flow rate of
fuel (hydrogen), oxidant (air zero), and make-up gas were 30, 300,
and 25 mL min1, respectively. The inlet and detector were kept at
260 8C and 275 8C, respectively. The instrument was calibrated for
methamphetamine in the range of 0.0025–2 mg mL1 where n = 6
for each calibration standard injected.
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