The hydrazine present in the solution was determined by the method
of Watt and Chrisp (S1). The calibration curve was plotted as follows.
A series of standard solutions were prepared by pipetting suitable
volumes of the hydrazine hydrate in colorimetric tubes and making
up to 5 mL. Then, 5 mL of color reagent (a mixture of para-(dimethylamino)
benzaldehyde (5.99 g), HCI (concentrated, 30 mL), and ethanol (300
mL) was used as a color reagent) was added and stirred for 10 min
at room temperature. Thereafter, the absorbance of the resulting solution
was measured at 460 nm, and the yields of hydrazine were estimated
from a standard curve.
of Watt and Chrisp (S1). The calibration curve was plotted as follows.
A series of standard solutions were prepared by pipetting suitable
volumes of the hydrazine hydrate in colorimetric tubes and making
up to 5 mL. Then, 5 mL of color reagent (a mixture of para-(dimethylamino)
benzaldehyde (5.99 g), HCI (concentrated, 30 mL), and ethanol (300
mL) was used as a color reagent) was added and stirred for 10 min
at room temperature. Thereafter, the absorbance of the resulting solution
was measured at 460 nm, and the yields of hydrazine were estimated
from a standard curve.
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