DEHA
www.chemetrics.com | 1-800-356-3072
Methods
Dissolved oxygen in boiler system water causes corro- Range: 25-250 ppm
sion and pitting of metal surfaces, which can lead to
MDL: 25 ppm / Method: Ceric Sulfate Titrant with Ferroin Indicator
boiler inefficiency, equipment failure, and system
Cat#
downtime. DEHA (N, N-Diethylhydroxylamine) is added
Titrets Kit K-3925
to boiler system water as an oxygen scavenger to keep
Increments:
25, 27.5, 30, 32.5, 35, 37.5, 40, 45, 50, 62.5, 75, 87.5, 100, 125, 175, 250 ppm
the dissolved oxygen levels as low as possible.
Kit comes in a cardboard box and contains everything needed to perform 30
tests: thirty ampoules with valve assemblies, Activator Solution, titrettor, 25 mL
sample cup, instructions, and MSDS.
The PDTS Method
Reference: J. A. Tetlow and A. L. Wilson,
“Determination of Iron in Boiler Feedwater,” Analyst,
Instrumental Kits
1958.
The test kits employ the PDTS chemistry, in which
V-2000 Multi-Analyte Photometer
DEHA reduces iron III (ferric state) to iron II (ferrous
(See page 12 for instrumental features)
state), which readily reacts with PDTS (3-(2-pyridyl)-5,6-
bis(4-phenylsulfonic acid)-1,2,4-triazine disodium salt)
Range: 0.15-2.00 ppm
to form a pink-purple colored complex in direct pro-
Method: PDTS
portion to the DEHA concentration. Test results are
Cat#
expressed in ppb (μg/L) or ppm (mg/L) DEHA.
Vacu-vials Kit K-3903
Kit comes in a cardboard box and contains everything needed to perform 30
The Ceric Sulfate Titrimetric Method
tests: thirty ampoules, Activator Solution, 25 mL sample cup, ampoule blank,
instructions, calibration table, and MSDS.
Reference: Developed by CHEMetrics, Inc.
Vacu-vials Kits require the use of the V-2000 Photometer or a
CHEMetrics developed a titrimetric method that
spectrophotometer capable of accepting a 13 mm diameter round cell.
Instrument sold separately.
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
Kit Components common to DEHA
sulfate titrant. Test results are expressed in ppm (mg/L) Description Cat#
DEHA.
Sample Cup Pack, 25 mL (6 ea) A-0013
Ampoule Blank Pack (5 ea) A-0023
Titrettor Pack (1 ea) A-0053
Visual Kits
Instructions are posted on our website.
Range: 0-400 & 400-3000 ppb
MDL: 15 ppb / Method: PDTS
Cat#
CHEMets Kit K-3902
CHEMets Refill, 30 ampoules R-3902
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-3900
1
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.
1
The accessory pack supplies enough solution to perform at least
200 tests.
If no shelf-life is listed for a product, then the shelf-life is at least 2 years.
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