Ammonium thiocyanate solution (10 mM)(0.05 mL) was added and the sample was vortexed for 2–4 s. Then, 0.05 mL iron (II) solution was added and the sample was vortexed for 2–4 s
Ammonium thiocyanate solution (10 mM)(0.05 mL) was added and the sample was vortexed for 2–4 s. Then,0.05 mL iron (II) solution was added and the sample was vortexed for2–4 s