Hydrazine Test Kits
Visual Kits
| Range | MDL | Method | Type | Kit | Refill |
|---|---|---|---|---|---|
| 0.00 - 0.5 ppm | 0.005 ppm | PDMAB | CHEMets | K-5005 | R-5005 |
| 0 - 12.5 ppm | 2.5 ppm | PDMAB | HR CHEMets | K-5020D | R-5005 |
| 0 - 500 ppm | 10 ppm | PDMAB | HR CHEMets | K-5020C | R-5005 + A-0171 |
CHEMetrics offers visual Hydrazine test kits in a variety of ranges employing the well-known PDMAB reagent to deliver sensitivity and accuracy within two minutes. This method develops a yellow colour in direct relation to the concentration of hydrazine present in the sample. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.
CHEMetrics visual hydrazine in water test kits feature self-filling CHEMets® ampoules that contain pre-measured reagent for a single test. Simply snap the ampoule directly in a sample to draw in the correct volume of sample and then compare to colour standards to find the concentration. For higher ranges HR CHEMets® are used which make diluting your sample simple.
PDMAB Method
CHEMetrics' hydrazine test kits employ the PDMAB, paradimethylaminobenzaldehyde chemistry. PDMAB in acid solution reacts with hydrazine to form a yellow product. Results are expressed as ppb (µg/l) or ppm (mg/l) N2H4.
References:
ASTM D 1385-07, Hydrazine in Water.
L. C. Thomas and G. J. Chamberlin, Colorimetric Chemical Analytical Methods, 8th ed., pp. 194-195, Method I (1974).
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Technical Data Sheet |
Applications
Hydrazine is a powerful reducing agent that is used as an oxygen scavenger in high-pressure boilers in conventional electrical and nuclear power plants, reacting with dissolved oxygen to form nitrogen and water. Under high pressure and temperature, ammonia is also formed, raising the pH and preventing acidic corrosion. Hydrazine also passivates copper and oxidised steel surfaces in the system preventing corrosion. Unlike other oxygen scavengers, hydrazine does not increase total dissolved solids (TDS) within the system.
When using hydrazine as an oxygen scavenger for a boiler system, measuring the residual hydrazine is critical for maintaining a safe and efficient boiler. Monitoring residual hydrazine ensures sufficient dosing is taking place to prevent corrosion but not so much that chemical is wasted.
Residual hydrazine is typically maintained in the 0.05 to 0.1 mg/l range. Higher levels may be used to guard against corrosion when the boiler is in layup conditions.
Hydrazine has many other uses, including as a spacecraft propellant and in rocket fuels, as well as in various chemical processes such as air bag manufacturing, as a foaming agent in polymer foam manufacturing, and as a precursor to agrochemicals and pharmaceuticals.
What is Hydrazine?
Hydrazine is an inorganic compound with the chemical formula NH2-NH2, also written as N2H4. It is a colourless, fuming liquid at room temperature that smells similar to ammonia.
Hydrazines are organic compounds featuring a hydrazine group (R2N-NR2), i.e. two nitrogen atoms linked with a covalent bond and attached to up to four akyl groups (alkylhydrazine) or four aryl groups (arylhydrazine). For example, dimethylhydrazine has the chemical formula (CH3)2-N-NH2. Hydrazides instead feature an acyl, sulponyl or phosphoryl group(s) instead of alkyl or aryl group(s) and are non-basic.
Hydrazine and hydrazines are extremely toxic, and acute exposure can cause liver, kidney and central nervous system damage in humans, and is a probable human carcinogen. Hydrazine a powerful reducing agent, and is highly inflammable, exploding if traces of air are present during distillation, and is therefore commonly handled as a solution of hydrazine hydrate ( N2H4.xH2O). Hydrazine is manufactured by the ketazine process, whereby ammonia is oxidised by chlorine or chloramine in the presence of acetone or another aliphatic ketone. The ketazine produced is hydrolysed to hydrazine.