Caldur® Iron HRS – Colorimetric
Iron determination in water by color chart (0.2-10 mg/l Fe) – High Range
Private customers can also find our range in our partner store Ampha-Analyse.
Reagent for Caldur® Iron HRS – Colorimetric:
See also:
CALDUR® Iron HRS Test Set – Colorimetric
What is iron measured for?
Iron is a naturally occurring element that can be found in almost all bodies of water and groundwater sources. Although iron is essential for the human body, too high a concentration in drinking water can lead to undesirable effects. Elevated iron levels cause a brownish discoloration of the water, a metallic taste and can lead to deposits in pipes and household appliances.
The limit value for drinking water in Germany is 0.2 mg/l (Drinking Water Ordinance). The CALDUR® Iron HRS test set is specially designed for measuring higher iron concentrations and is particularly suitable for industrial applications, boiler water and process water, where higher iron contents frequently occur.
Iron can enter the water from various sources: natural leaching from iron-containing rock layers, corrosion of iron pipes, industrial discharges or through iron-containing additives in water treatment. It is particularly important to monitor the iron content in steam boilers and cooling circuits, as increased concentrations can lead to corrosion and deposits.
How does the test set work?
The CALDUR® Iron HRS Test Set – Colorimetric works according to the proven O-phenanthroline method. O-phenanthroline (1,10-phenanthroline) forms an intense orange-red color complex with iron(II) ions, the intensity of which is proportional to the iron concentration. The reaction is highly specific for iron and enables reliable determination even at higher concentrations.
After a reaction time of 4 minutes, the measured value is determined by direct color comparison with a supplied 6-stage color chart. This colorimetric method enables fast and reliable on-site determination without the need for expensive laboratory equipment.
Advantages of the CALDUR® test set
- Extended measuring range up to 10 mg/l – ideal for industrial applications
Perfect for boiler water, process water and applications with higher iron concentrations
- Quick analysis in just 4 minutes
Ideal for on-site use – saves time and enables immediate decisions
- 150 provisions per set – economical in continuous use
Cost-efficient for regular checks in industry and water treatment
- Only 1 reagent required – particularly easy handling
Fewer work steps for faster results
- Proven O-phenanthroline method – internationally recognized
Reliable and reproducible results according to a standardized procedure
- Robust, waterproof plastic housing with hinged lid
Safe transportation and protection of reagents – durable and reliable
Areas of application
Carrying out the measurement:
- Fill water sample into test tube up to the 10 ml mark
- Add 5 drops of iron HRS reagent and mix
- Wait 4 minutes until the color has fully developed
- Evaluation by color comparison with color chart
💡 Tip for best results
For best results, the water sample should be clear and free of suspended solids.
If the water is cloudy, pre-filtration with a filter paper (e.g. Whatman No. 1) is recommended.
⚠️ Important notes
- Bring reagents to room temperature before use (20-25°C)
- Adhere exactly to waiting times for precise measurement results
- Avoid direct sunlight during the measurement
- Rinse test tubes thoroughly with distilled water after use
- Use the CALDUR® Iron LR or LRS test set for concentrations below 0.2 mg/l
Measuring range
| Measuring level | Description |
|---|---|
| 0.2 mg/l | Low concentration (slightly orange) |
| 0.5 mg/l | Slightly increased concentration (orange) |
| 1.0 mg/l | Increased concentration (clearly orange) |
| 2.5 mg/l | High concentration (intense orange) |
| 5.0 mg/l | Very high concentration (dark orange) |
| 10 mg/l | Very high concentration (red-brown) |
If the color is between two fields, you can form the mean value
(e.g. between 1.0 and 2.5 mg/l = approx. 1.5-2.0 mg/l).
Number of possible provisions
You can carry out 150 measurements with one CALDUR® iron HRS test set.
This refers to the quantity of reagents contained.
Measuring accuracy and reproducibility
Readability: ± 1 color level
Reproducibility: Very good if the application instructions are followed
Interferences: Turbidity and coloration of the sample can influence the result (filter the sample if necessary).
What to do if measured values are out of range?
Measured value > 10 mg/l
| Dilution | Procedure | Calculation of the measured value |
|---|---|---|
| 1:1 | 5 ml sample + 5 ml distilled water | Measured value × 2 |
| 1:4 | 2 ml sample + 8 ml distilled water | Measured value × 5 |
| 1:9 | 1 ml sample + 9 ml distilled water | Measured value × 10 |
Measured value < 0.2 mg/l
For concentrations below 0.2 mg/l, we recommend the CALDUR® Iron LR test set (measuring range 0.05-1.0 mg/l) or the Iron LRS test set (measuring range 0.01-0.5 mg/l) for even more sensitive measurements.
Specifications at a glance
Reagent (O-phenanthroline)
| Property | Value |
|---|---|
| Parameters | Iron (Fe) – High Range |
| Item number | 31-072630 |
| Method | Colorimetric (O-phenanthroline) |
| Measuring principle | Color comparison with 6-stage color chart |
| Measuring range | 0.2 to 10 mg/l Fe |
| Color scale | 6 measuring levels (0.2 / 0.5 / 1.0 / 2.5 / 5.0 / 10 mg/l) |
| Analysis time | 4 minutes |
| Number of provisions | 150 |
| Number of reagents | 1 (O-phenanthroline reagent) |
| Packaging | Hinged lid box |
| Packaging size | 103 x 91 x 36 mm |
| weight | approx. 150 g |
| Scope of delivery |
|---|
| 1 reagent bottle (O-phenanthroline reagent) with detailed labeling |
| 1 test tube with 10 ml scale |
| 1 color card with 6 measuring levels |
| Detailed operating instructions (DE/EN) |
| Safety data sheets for all reagents |
| Robust hinged lid box (103 x 91 x 36 mm) |
Reagent details
| Reagent | Volume | Shelf life | Notes |
|---|---|---|---|
| Iron HRS Reagent | 15 ml | 48 months (48M) | O-phenanthroline solution, shake before use |
Shelf life: The shelf life starts from the date of manufacture (printed on the bottle).
After opening, the reagents should be used within 12 months.
Store the test kit in a dry, cool place (10-25°C) and away from direct sunlight.
Additional information
| Packaging | Hinged lid box, Refill pack |
|---|
Flyer
Operating instructions
Instructions for use
Instructions for use
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