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DEHA |
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Methods
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.
The PDTS Method
Reference: J. A. Tetlow and A. L. Wilson, “Determination of Iron in Boiler Feedwater,” Analyst, 1958.
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-phenylsulfonic acid)-1,2,4-triazine disodium salt) to form a pink-purple colored complex in direct proportion to the DEHA concentration. Test results are expressed in ppb (mg/L) or ppm (mg/L) DEHA.
The Ceric Sulfate Titrimetric Method
Reference: Developed by CHEMetrics, Inc.
CHEMetrics developed a titrimetric method that employs a ceric sulfate titrant and ferroin end point indicator. DEHA reduces ferric iron to the ferrous state, and the resulting ferrous iron is titrated with the ceric sulfate titrant. Test results are expressed in ppm (mg/L) DEHA. |
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| • Click to View MSDS and Kit instructions |
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 Visual Kits |
0-400 & 400-3000 ppb
15 ppb / Method: PDTS |
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Cat# |
| CHEMets Kit |
K-3902 |
| | CHEMets Refill, 30 ampoules | R-3902 |
| | Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-3900 |
| | Low Range Comparator, Shelf-life 2 years:
0, 30, 60, 100, 150, 200, 300, 400 ppb | C-3901 |
| | High Range Comparator, Shelf-life 2 years:
400, 600, 800, 1000, 1200, 1600, 2000, 2500, 3000 ppb | C-3902 |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Low and High Range Comparator, Activator Solution, 25 mL sample cup, instructions and MSDS. | |
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25-250 ppm
25 ppm / Method: Ceric Sulfate Titrant with Ferroin Indicator |
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Cat# |
| Titrets Kit |
K-3925 |
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25, 27.5, 30, 32.5, 35, 37.5, 40, 45, 50, 62.5, 75, 87.5, 100, 125, 175, 250 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, thirty valve assemblies, Activator Solution, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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 Instrumental Kits |
0.15-2.00 ppm
PDTS |
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Cat# |
| Vacu-vials Kit |
K-3903 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, Activator Solution1, 25 mL sample cup, ampoule blank, instructions, calibration table, and MSDS. | |
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Kit Components common to DEHA |
| Description |
Cat# |
| | Sample Cup Pack, 25 mL (6 ea) | A-0013 |
| | Ampoule Blank Pack (5 ea) | A-0023 |
| | Titrettor Pack (1 ea) | A-0053 |
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