Caldur® Iron LR – Photometric
Determination of iron in water using a photometer (0.2-2.0 mg/l Fe)
Private customers can also find our range in our partner store Ampha-Analyse.
Reagent for Caldur® Iron LR – Photometric:
See also:
CALDUR® Iron LR Test Set – Photometric
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). However, significantly higher values are measured in many wells and groundwater sources, which is why regular monitoring is essential. Monitoring the iron content is particularly important in water treatment, swimming pools and industrial processes.
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. The oxidation of dissolved iron(II) to iron(III) leads to the characteristic rusty brown coloration and turbidity of the water.
How does the test set work?
The CALDUR® Iron LR Test Set – Photometric works according to the proven ferrozine method. Ferrozine forms an intense violet color complex with iron(II) ions, the intensity of which is proportional to the iron concentration. By adding two reagents to the water sample, any iron(III) present is first reduced to iron(II) in order to determine the total iron concentration.
After a reaction time of 4 minutes, the evaluation is carried out photometrically using the WINLAB Data Line photometer. This photometric method enables a particularly precise and objective measurement of the iron concentration. The extended measuring range of 0.2 to 2.0 mg/l makes this test set ideal for applications where higher iron concentrations are expected.
Advantages of the CALDUR® test set
- Quick analysis in just 4 minutes
Ideal for on-site use – saves time and enables immediate decisions
- Extended measuring range up to 2.0 mg/l
Perfect for applications with higher iron concentrations
- 150 provisions per set – economical in continuous use
Cost-efficient for regular checks in waterworks, industry and private wells
- Photometrically applicable with WINLAB Data Line
Precise laboratory analyses with photometer for objective measurement results
- Easy handling
Clear instructions and simple measurement procedure
- Compact packaging in a plastic bag
Space-saving and ideal for mobile use
Areas of application
Carrying out the measurement:
- Fill water sample into test tube up to the 10 ml mark
- Add 5 drops of reagent A and mix
- Add 5 drops of reagent B and mix
- Wait 4 minutes until the color has fully developed
- Perform photometric measurement with the WINLAB Data Line photometer
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
- Adhere exactly to waiting times for precise measurement results
- Avoid direct sunlight during the measurement
- Rinse test tubes thoroughly with distilled water after use
Measuring range
| Measuring level | Description |
|---|---|
| 0.2 mg/l | Drinking water limit value (violet) |
| 0.5 mg/l | Increased concentration (clearly violet) |
| 1.0 mg/l | High concentration (intense violet) |
| 1.5 mg/l | Very high concentration (dark violet) |
| 2.0 mg/l | Maximum measuring range (very dark violet) |
The evaluation is carried out with the WINLAB Data Line photometer for precise and objective measurement results.
Number of possible provisions
You can carry out 150 measurements with one CALDUR® iron LR test set.
This refers to the quantity of reagents contained.
Measuring accuracy and reproducibility
Readability: ± 1 measuring level (photometric)
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 > 2.0 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
Measured value is below the detection limit. For lower concentrations, please use the CALDUR® Iron LRS test set (0.01 – 0.5 mg/l).
Specifications at a glance
Reagents (reagent A, B)
| Property | Value |
|---|---|
| Parameters | Iron (Fe) |
| Item number | 31-073312 |
| Method | Photometric (ferrozine) |
| Measuring principle | Photometric measurement with WINLAB Data Line Photometer |
| Measuring range | 0.2 to 2.0 mg/l Fe |
| Color scale | 5 measuring levels (0.2 / 0.5 / 1.0 / 1.5 / 2.0 mg/l) |
| Analysis time | 4 minutes |
| Number of provisions | 150 |
| Packaging | Plastic bag or refill pack |
| weight | approx. 150 g |
| Scope of delivery |
|---|
| 2 reagent bottles (reagent A, B) with detailed labeling |
| 1 test tube with 10 ml scale |
| Detailed operating instructions (DE/EN) |
| Safety data sheets for all reagents |
| Packaging: plastic bag or refill pack |
Reagent details
| Reagent | Volume | Shelf life | Notes |
|---|---|---|---|
| Reagent A | 15 ml | 24 months (24M) | Reducing agent, shake before use |
| Reagent B | 15 ml | 24 months (24M) | 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 | Plastic bag, Refill pack |
|---|
