dilute definite
amounts of the malachite green and leucomalachite green standard stock solutions as well as the
mixed internal standard solution exactly with acetonitrile-water (1:1) to prepare several standard
solutions containing 0.5-20 ng/mL of malachite green and 0.5-20 ng/mL of leucomalachite green
as well as 5 ng of MG-d5 and 5 ng LMG-d6 for preparing the calibration curve.
B.