Spectrophotometric Determination of Hydrazine Sulphate using Fe(II)-2,2'-Bipyridyl-Application to Various Water Samples

Abstract

Hydrazineis an inorganic chemical compound with the chemical structure N2H4.Hydrazine a colorless flammable liquid compound. Hydrazine is very toxic andunstable compound, also hydrazine is a strong reducing agent. This compoundeasily ignites in the air, generating a large amount of heat and thecomposition of nitrogen gas and water. Symptoms of acute (short-term) exposureto high levels of hydrazine may include irritation of the eyes, nose, throat,dizziness, headache and nausea. Acute exposure can also damage the liver,kidneys and central nervous system. Cases of lungs, liver, spleen and thyroidinfection in animals exposed to hydrazine have been reported by inhalation.Increased lung injury, nasal cavity, and liver tumors were observed in rodentsexposed to hydrazine. This work involves the development of a fast andsensitive spectrophotometric method for the determination of trace ofhydrazine, the method based on the reduction of ferric ions by hydrazing toferrous ions, and finally the later reacts with the reagent (2,2'-bipyridyl) at60°C to form a stable red-pink complex, this complex is soluble in water andgave absorption maxima at 523 nm. Beer's law was agreed with range (50-800) µgof hydrazine per 25 ml (i.e: 2-32 ppm), with a corresponding molar absorptivityof 5.6×103 l.mol-1.cm-1, Sandell's sensitivityindex of  0.02 µg.cm-2 limitof quantitation of 0.3 µg/ml, limit of defection 0.1 µg/ml , and finallyaverage relative standard deviation of +1.25%, depend on theconcentration level. This method had been applied successfully to determinationof hydrazine amount in different samples water (tap water, river water and seawater).