A 1% sodium borohydride (NaBH4) in 0.4% NaOH solution was used as
a reducing agent. The reaction time was 10 seconds through quartz cell and argon gas was used as a carrier gas.
GF-AAS measurements. A Varian GTA 120 and a Varian AA2402 Zeeman (Varian, Australia), a modifier of 2000
ppm nickel, injection volume of 10 μL, and a support gas of argon were used in this study. The temperature
program can be found in Table 2.