Hach 21679-69 DEHA Reagent 1 Powder Pillows
Overview
Hach 21679-69 is a genuine Hach DEHA Reagent 1 Powder Pillow formulation, supplied in packs of 100, used for the determination of oxygen scavengers in boiler feedwater and process water systems by the iron reduction method. Formulated to support Hach Method 8140, the Hach 21679-69 reagent enables plant chemists and water treatment technicians to quantify diethylhydroxylamine (DEHA), carbohydrazide, hydroquinone, iso-ascorbic acid and methylethylketoxime concentrations, giving operators the analytical data needed to verify correct oxygen scavenger dosing in steam and boiler systems.
As the official authorized partner and exclusive regional representative for Hach, Seven Star LLC proudly supplies genuine Hach 21679-69 DEHA Reagent 1 Powder Pillows to industrial plants throughout Oman and the GCC. Every pack shipped from our Muscat-based facility is sourced directly through Hach’s authorized distribution channel, ensuring authentic reagent chemistry, correct shelf-life dating and full compatibility with existing Hach spectrophotometers and DR900-series colorimeters already deployed across regional power generation and process water laboratories.
Operating Principle
The Hach 21679-69 DEHA Reagent 1 is the chromogenic half of the two-reagent iron reduction method specified in Hach Method 8140. In the reaction, the oxygen scavenger present in the sample — DEHA, carbohydrazide, hydroquinone, iso-ascorbic acid or methylethylketoxime — reduces the ferric iron supplied by the companion DEHA Reagent 2 Solution to the ferrous state, in an amount equivalent to the scavenger concentration. The indicator chemistry of the Reagent 1 powder pillow then forms a purple complex with that ferrous ion, and the intensity of the purple colour is directly proportional to the oxygen scavenger present, allowing quantification across a working range of approximately 3–450 µg/L DEHA and up to 1000 µg/L for related compounds.
Because the reaction chemistry is standardized and repeatable, results obtained using DEHA Reagent 1 in conjunction with the companion DEHA Reagent 2 solution provide plant chemists with reliable, laboratory-grade quantification without requiring wet chemistry titration setups. This allows boiler water treatment programs to verify oxygen scavenger residuals are maintained within the target range needed to prevent dissolved oxygen corrosion in feedwater heaters, economizers and boiler tubes, protecting capital equipment from premature failure.
Engineering Design of the Hach 21679-69
The reagent is supplied as pre-measured powder pillows, each containing a single-dose quantity of the formulated iron reduction reagent chemistry sealed within a tear-open foil pouch. This single-use format eliminates the measurement error and contamination risk associated with bulk powder handling, ensuring consistent reagent dosing across every test performed by laboratory or field personnel using Hach Method 8140 procedures.
Each pack of 100 powder pillows provides sufficient reagent for 50 complete oxygen scavenger tests when paired with DEHA Reagent 2, supporting sustained testing programs across boiler water treatment monitoring schedules. The reagent is compatible with Hach DR-series spectrophotometers and portable colorimeters commonly deployed in power plant and process water laboratories, integrating directly into existing Hach-based water quality testing programs without requiring additional calibration equipment.
Key Features
The Hach 21679-69 DEHA Reagent 1 Powder Pillow delivers dependable performance around the following capabilities:
- Supports Hach Method 8140 for oxygen scavenger determination by the iron reduction colorimetric method.
- Quantifies DEHA, carbohydrazide, hydroquinone, iso-ascorbic acid and methylethylketoxime concentrations.
- Working range of approximately 3–450 µg/L DEHA supports precise boiler feedwater monitoring.
- Pre-measured single-dose powder pillow format eliminates dosing error and contamination risk.
- Pack of 100 pillows provides reagent for 50 complete tests when paired with DEHA Reagent 2.
- Compatible with Hach DR-series spectrophotometers and portable colorimeters for lab or field testing.
- Genuine Hach chemistry ensures repeatable, laboratory-grade analytical results across testing programs.
- Supports proactive boiler water treatment verification to prevent dissolved oxygen corrosion damage.
Test Procedure, Handling and Interferences
In the published Method 8140 procedure the oxygen scavenger in the sample reduces ferric iron supplied by DEHA Reagent 2 to the ferrous state, and it is the chromogenic chemistry of the Hach 21679-69 powder pillow that then binds that ferrous ion to form a purple complex whose intensity is read at 562 nm on a DR-series spectrophotometer or 560 nm on a colorimeter. One pillow is added to the 25 mL sample and one to the reagent blank — the reason a 100-pillow pack corresponds to 50 complete determinations — followed by 0.5 mL of DEHA Reagent 2 and a reaction period in a dark location of ten minutes, shortened to two minutes when hydroquinone is the scavenger in use.
Method performance depends on disciplined sampling. Samples must be analysed immediately and cannot be preserved: the bottle is filled to overflow and capped at once, agitation and air contact are avoided, and the sample is brought to 25 ± 3 °C (77 ± 5 °F) before the reagents are added. Light exposure during colour development produces a positive bias, which is why the dark reaction period is specified rather than optional. Ferrous iron already present in the feedwater interferes at all levels and must be determined separately and subtracted, while cobalt above 0.025 mg/L, lignosulfonates above 0.05 mg/L and copper above 8.0 mg/L are the interferences most often encountered in treated boiler systems. Unopened Hach 21679-69 pillows should be kept in their original carton, dry and out of direct sunlight, and used within the printed expiry date supplied with each batch.
Industrial Applications
The Hach 21679-69 DEHA Reagent 1 is used extensively in power generation plant chemistry laboratories, industrial steam boiler operations, and process water treatment facilities where oxygen scavenger dosing must be verified to protect high-pressure boiler and feedwater systems from corrosion damage. In Oman’s power generation and desalination sector, as well as petrochemical steam systems across Muscat, Sohar and Salalah, plant chemists rely on DEHA Reagent 1 testing to confirm oxygen scavenger residuals remain within specification across daily and shift-based monitoring routines.
As the officially authorized partner for Hach in Oman and the GCC, Seven Star LLC distributes genuine 21679-69 reagent packs to power plant laboratories, water treatment operators and industrial testing contractors throughout the region, backed by regional warehouse stock and manufacturer-authenticated supply with confirmed shelf-life dating. Facilities across Sohar’s industrial port zone and Salalah’s free trade zone depend on Seven Star LLC for genuine Hach reagent chemistry with full batch traceability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | Hach 21679-69 |
| Description | DEHA Reagent 1 Powder Pillows |
| Method | Hach Method 8140, Iron Reduction |
| Quantity | 100 powder pillows per pack (50 tests) |
| Range (DEHA) | 3–450 µg/L |
| Range (Carbohydrazide) | 5–600 µg/L |
| Range (Hydroquinone) | 9–1000 µg/L |
| Range (Iso-ascorbic Acid) | 13–1500 µg/L |
| Range (Methylethylketoxime) | 15–1000 µg/L |
| Wavelength | 562 nm (spectrophotometer) / 560 nm (colorimeter) |
| Sample Volume | 25 mL |
| Reaction Time | 10 minutes in the dark (2 minutes for hydroquinone) |
| Sample Temperature | 25 ± 3 °C (77 ± 5 °F) |
| Sensitivity | 3–14 µg/L per 0.010 Abs change |
| Companion Reagent | DEHA Reagent 2 Solution (Hach 21680-42), 0.5 mL per bottle |
| Compatible Instruments | Hach DR-series spectrophotometers, colorimeters |
Request a Quote for Hach 21679-69 DEHA Reagent 1 Powder Pillows
Seven Star LLC invites plant chemists and procurement teams across Oman and the GCC to submit a formal RFQ for the Hach 21679-69 DEHA Reagent 1 Powder Pillows. As the authorized partner for Hach in Oman and the GCC, we maintain regional warehouse stock for rapid dispatch, provide technical datasheets and method sheets on request, and offer direct access to our water analytics division for testing program support. Contact Seven Star LLC today to secure genuine Hach 21679-69 reagent with full manufacturer traceability and regional warranty backing.
Related Products
Hach is a global leader in water quality analysis and laboratory instrumentation, providing reliable solutions for monitoring and improving water and wastewater processes. Founded in 1947, Hach has built a strong reputation for accuracy, innovation, and ease of use in analytical measurement.
Its comprehensive product range includes spectrophotometers, turbidity meters, pH and conductivity sensors, online analyzers, and reagent kits designed for precise measurement and regulatory compliance. Hach instruments are widely used in municipal water treatment, environmental monitoring, industrial process control, and laboratory applications.
Seven Star LLC supplies authentic Hach analytical instruments and sensors to clients across the Middle East, offering dependable water analysis solutions backed by proven global expertise and local technical support.
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