CALDUR® Iron LRS – Photometric
Photometric determination of iron in water (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 – Photometric:
See also:
CALDUR® Iron LRS 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). 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 precisely.
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 photometric monitoring of the lowest 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 – Photometric 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 WINLAB Data Line photometer is used for precise evaluation. The photometer measures the absorbance of the colored solution and automatically calculates the exact iron concentration. This method offers maximum accuracy and reproducibility for demanding laboratory applications and quality controls.
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
- Precise photometric evaluation with digital measured value
Objective results without subjective color assessment
- 100 determinations 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
- Quick analysis in just 5 minutes
Efficient for routine checks and quality assurance
- High reproducibility and documentability
Perfect for quality management systems and logging
Areas of application
⚠️ Hazard information (from the label)
Iron LRS – Danger
H314 Causes severe skin burns and eye damage.
Full information on all components: see the safety data sheet (SDS).
Carrying out the measurement:
- Fill water sample into test tube up to the 10 ml mark
- Add 6 drops of ferrozine reagent
- Close the test tubes and shake well
- Wait for 5 minutes reaction time (purple color develops)
- Perform photometric measurement with the WINLAB Data Line photometer
- Read the result directly on the display (in mg/l Fe)
💡 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.
The reaction time of 5 minutes should be strictly adhered to, as the color intensity is time-dependent.
For maximum precision, the photometer should be calibrated regularly.
⚠️ Important notes
- Bring reagents to room temperature before use (20-25°C)
- Adhere exactly to the reaction time of 5 minutes for precise measurement results
- Avoid direct sunlight during the measurement
- Rinse test tubes and photometer cuvette thoroughly with distilled water after use
- Chlorine in the water can interfere with the measurement – reduce with thiosulphate if necessary
Measuring range
| Measuring level | Description |
|---|---|
| 0.01 mg/l | Very low concentration (detection limit) |
| 0.05 mg/l | Low concentration |
| 0.1 mg/l | Average concentration |
| 0.2 mg/l | Drinking water limit value |
| 0.35 mg/l | Elevated concentration |
| 0.5 mg/l | Upper measuring range limit |
The photometric measurement enables a continuous reading between the measuring points
with high precision (resolution 0.01 mg/l possible).
Number of possible determinations
You can carry out 100 measurements with one CALDUR® Iron LRS – Photometric test set.
This refers to the quantity of reagents contained.
Measuring accuracy and reproducibility
Readability: ± 0.02 mg/l (photometric)
Reproducibility: Excellent if the application instructions are followed
Interferences: Turbidity and coloration of the sample can influence the result (filter the sample if necessary). High copper concentrations can interfere with the measurement.
What to do if measured values are out of range?
Measured value > 0.5 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 < 0.01 mg/l
The measured value is below the detection limit. This is generally not critical and indicates
that the iron concentration is very low (water is harmless with regard to iron).
Specifications at a glance
Reagent (ferrozine solution)
| Property | Value |
|---|---|
| Parameters | Iron (Fe) |
| Item number | 31-073309 |
| Method | Photometric (ferrozine method) |
| Measuring principle | Photometric measurement with WINLAB Data Line Photometer |
| Measuring range | 0.01 to 0.5 mg/l Fe |
| Resolution | 0.01 mg/l (photometric) |
| Duration of analysis | 5 minutes |
| Number of determinations | 100 |
| Packaging | Plastic bag or refill pack |
| weight | approx. 150 g |
| Scope of delivery |
|---|
| 1 reagent bottle (ferrozine solution) 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 |
|---|---|---|---|
| Ferrozine solution | 30 ml | 36 months (36M) | 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 |
|---|---|
| Product category | Test kit |
Flyer
Operating instructions
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