Caldur® Iron LRS – Colorimetric
Iron determination in water by color chart (0.01-0.5 mg/l Fe) – Low Range Sensitive
Private customers can also find our range in our partner store Ampha-Analyse.
Reagent for Caldur® Iron LRS – Colorimetric:
See also:
CALDUR® Iron LRS 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 LRS test set is specially designed for the highly sensitive measurement of very low iron concentrations. With a detection limit of just 0.01 mg/l, it is ideal for monitoring drinking water, ultrapure water and applications where even the smallest traces of iron need to be detected.
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. Precise monitoring of extremely low iron concentrations is particularly important in drinking water treatment, in the food industry and in sensitive processes.
How does the test set work?
The CALDUR® Iron LRS Test Set – Colorimetric works according to the proven ferrozine method with optimized sensitivity. Ferrozine forms an intense violet color complex with iron(II) ions, the intensity of which is proportional to the iron concentration. The special reagent formulation enables the detection of iron concentrations as low as 0.01 mg/l.
After a reaction time of 5 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
- Highly sensitive measuring range from 0.01 mg/l – for trace analysis
Ideal for drinking water, ultrapure water and sensitive processes
- Quick analysis in just 5 minutes
Ideal for on-site use – saves time and enables immediate decisions
- 100 provisions per set – economical in continuous use
Cost-efficient for regular inspections in waterworks and industry
- Only 1 reagent required – particularly easy handling
Fewer work steps for faster results
- Can be used colorimetrically and optionally photometrically
Flexible for simple on-site tests or precise laboratory analyses with photometer
- 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 10 drops of iron LRS reagent and mix
- Wait 5 minutes until the color has fully developed
- Evaluation by color comparison with color chart or photometric measurement
💡 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.
Use particularly clean glassware for trace analysis.
⚠️ 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 HRS test set for concentrations above 0.5 mg/l
Measuring range
| Measuring level | Description |
|---|---|
| 0.01 mg/l | Trace concentration (barely visible violet) |
| 0.03 mg/l | Very low concentration (slightly violet) |
| 0.06 mg/l | Low concentration (light violet) |
| 0.1 mg/l | Slightly increased concentration (violet) |
| 0.2 mg/l | Drinking water limit value range (clearly violet) |
| 0.5 mg/l | Increased concentration (intense violet) |
If the color lies between two fields, you can form the mean value
(e.g. between 0.1 and 0.2 mg/l = approx. 0.15 mg/l).
Number of possible provisions
You can carry out 100 measurements with one CALDUR® Iron LRS 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 > 0.5 mg/l
For concentrations above 0.5 mg/l, we recommend the CALDUR® Iron LR test set (measuring range 0.05-1.0 mg/l) or the Iron HRS test set (measuring range 0.2-10 mg/l) for even higher concentrations.
Measured value < 0.01 mg/l
Measured value is below the detection limit. This is generally not critical and indicates
that the iron concentration is extremely low (water is harmless with regard to iron).
Specifications at a glance
Reagent (ferrozine)
| Property | Value |
|---|---|
| Parameters | Iron (Fe) – Low Range Sensitive |
| Item number | 31-072307 |
| Method | Colorimetric (ferrozine) |
| Measuring principle | Color comparison with 6-stage color chart |
| Measuring range | 0.01 to 0.5 mg/l Fe |
| Color scale | 6 measuring levels (0.01 / 0.03 / 0.06 / 0.1 / 0.2 / 0.5 mg/l) |
| Duration of analysis | 5 minutes |
| Number of provisions | 100 |
| Number of reagents | 1 (ferrozine reagent) |
| Packaging | Hinged lid box |
| Packaging size | 103 x 91 x 36 mm |
| weight | approx. 150 g |
| Scope of delivery |
|---|
| 1 reagent bottle (iron LRS 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 LRS Reagent | 25 ml | 48 months (48M) | Ferrozine 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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