DEHA Test Kits
Visual and Titrimetric Kits
| Range | MDL | Method | Type | Kit Cat. No. | Refill |
|---|---|---|---|---|---|
| 0 - 400 & 400 - 3,000 ppb | 15 ppb | PDTS | CHEMets | K-3902 | R-3902 |
| 25 - 250 ppm | 25 ppm | Ceric Sulphate Titrant w/ Ferroin Indicator | Titrets | K-3925 |
Instrumental Kit
| Range | Method | Type | Kit Cat. No. |
|---|---|---|---|
| 0 - 2.00 ppm | PDTS | Vacu-vials | K-3903 |
CHEMetrics offers test kits employing the well-known PDTS Method and also the innovative Ceric Sulphate Method to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests. DEHA concentrations are routinely measured in wastewater effluent, drinking water, surface water and seawater.
The PDTS Method
The test kits employ the PDTS chemistry, in which DEHA reduces iron III (ferric state) to iron II (ferrous state), which readily reacts with PDTS (3-(2-pyridyl)-5,6-bis(4-phenylsulphonic acid)-1,2,4-triazine disodium salt) to form a pink-purple coloured complex in direct proportion to the DEHA concentration. Test results are expressed in ppb (µg/l) or ppm (mg/l) DEHA.
Reference:
G. Frederick Smith Chemical Co., The Iron Reagents, 3rd ed., p. 47 (1980).
|
Technical Data Sheet |
The Ceric Sulphate Titrimetric Method
CHEMetrics developed a titrimetric method that employs a ceric sulphate titrant and ferroin end point indicator. DEHA reduces ferric iron to the ferrous state, and the resulting ferrous iron is titrated with the ceric sulphate titrant. Test results are expressed in ppm (mg/l) DEHA
Reference:
Developed by CHEMetrics.
|
|
Technical Data Sheet |
Applications
Dissolved oxygen in boiler system water causes corrosion and pitting of metal surfaces, which can lead to boiler inefficiency, equipment failure, and system downtime. DEHA (N,N- Diethylhydroxylamine) is added to boiler system water as an oxygen scavenger to keep the dissolved oxygen levels as low as possible and to passivate ferrous metal surfaces to magnetite in order to minimise such corrosion and ensure maximum system uptime.
Regular testing of boiler water for DEHA ensures correct dosing and optimal system efficiency. Too little DEHA could be detrimental to system health and too much means increased cost and wasted chemicals.
DEHA is often used in boilers because of its low toxicity and volatility, and ability to enter the steam phase in mid and high-pressure boilers. DEHA is frequently used to control dissolved oxygen in boilers during wet lay-up. DEHA also helps control pH within the boiler by degrading into neutralising amines.
Click here for more information on DEHA use and testing in boiler waters.
DEHA also has other uses as radical scavenger, antiozonant, polymerisation inhibitor, colour stabiliser in photography and discolouration inhibitor in phenolic polymer resins.
What is DEHA?
N,N-Diethylhydroxylamine (C2H5)2NOH, or DEHA, is a volatile amine and colourless liquid with a relatively low toxicity. The molecule consists of a central nitrogen atom with two ethyl groups and one hydroxyl group. It is commonly used for oxygen scavenging and typically supplied as a solution.