Micelles Mediated Zone Fluidics Method for Hydrazine Determination in Environmental Samples

Abstract

An automated flow method for the determination of hydrazine based on the concept of zone-fluidics has been developed. The analyte reacts under flow conditions with p-dimethylamino benzaldehyde (25 mmol L−1) in micellar medium (100 mmol L−1 SDS) to form a stable derivative (460 nm). Micelles mediated catalysis excludes the use of highly acidic environment typical for this kind of reaction. Following careful examination of chemical and instrumental variables, the method allows the determination of hydrazine at the low micromolar level (0.3–10 μmol L−1) in water samples. Real sample analyses (drinking and boiler feed water) resulted in satisfactory results in terms of accuracy with the percent recoveries being in the range of 82–114%.

Fluorimetric Method for the Determination of Histidine in Random Human Urine Based on Zone Fluidics

“…Among flow-based methods the concept of Zone Fluidics (ZF) offers some additional features including effective manipulation of reactants zones at the micro-liter level, adaptation of various chemistries through single channel configurations, minimization of waste generation, even efficient coupling to separation techniques as a front-end sample preparation platform [13,14]. ZF coupled to analytical derivatization have proven as an advantageous alternative to the development of robust and reliable methods for a variety of analytes such as hydrazine [15], adamantane derivatives [16], dopamine [17], creatinine [18], etc.…”