Caldur® Chromium – Photometric
Chromium (VI) determination in water using a photometer (0.02-0.7 mg/l Cr VI)
Private customers can also find our range in our partner store Ampha-Analyse.
Reagent for Caldur® Chromium – Photometric:
See also:
CALDUR® Chromium Test Set – Photometric
What is chromium measured for?
Chromium is a heavy metal that occurs in various oxidation states. Hexavalent chromium (chromium VI or chromate), which is considered toxic and carcinogenic, is particularly relevant for water analysis. Chromium mainly enters the water through industrial processes such as electroplating, tanning, metal finishing and steel production. Natural sources such as chromium-containing rocks can also contribute to contamination.
The limit value for drinking water is 0.05 mg/l chromium (Drinking Water Ordinance). As chromium VI is considerably more toxic than chromium III, particular importance is attached to the determination of this form in water monitoring. Regular monitoring is essential for the protection of health and compliance with environmental regulations.
How does the test set work?
The CALDUR® Chromium Test Set – Photometric works according to the proven diphenylcarbazide method. Hexavalent chromium (Cr VI) reacts with 1,5-diphenylcarbazide in an acidic solution to form a violet-red color complex. The intensity of the coloration is directly proportional to the chromium concentration in the sample.
The evaluation is carried out photometrically with the WINLAB Data Line photometer, which enables particularly precise and reproducible measurement. The extended measuring range of 0.02 to 0.7 mg/l is ideal for monitoring drinking water and industrial wastewater.
Advantages of the CALDUR® test set
- Quick analysis in just 5 minutes
Ideal for on-site use – saves time and enables immediate decisions
- High precision due to photometric evaluation (from 0.02 mg/l)
Perfect for compliance with the Drinking Water Ordinance and for sensitive applications
- 150 provisions per set – economical in continuous use
Cost-efficient for regular inspections in industry and waterworks
- Photometric measurement with WINLAB Data Line
Objective, reproducible results without subjective color assessment
- Specific for chromium VI (chromate)
Determination of the toxic relevant chromium form – important for health protection
- Compact packaging in a plastic bag
Space-saving and economical – ideal for laboratory 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 (acid) and mix
- Add 5 drops of reagent B (diphenylcarbazide) and mix
- Wait for 5 minutes reaction time
- 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.
The reaction time of 5 minutes should be observed for optimum color development.
Important notes
- Bring reagents to room temperature before use
- Adhere exactly to the reaction time of 5 minutes
- Avoid direct sunlight during the measurement
- Rinse test tubes thoroughly with distilled water after use
- This test kit only determines chromium VI (chromate)
Measuring range
| Measuring level | Description |
|---|---|
| 0.02 mg/l | Very low concentration (barely visible) |
| 0.05 mg/l | Low concentration (light pink) |
| 0.1 mg/l | Slightly increased concentration (pink) |
| 0.2 mg/l | Elevated concentration (pink-violet) |
| 0.5 mg/l | Average concentration (violet) |
| 0.7 mg/l | High concentration (dark violet) |
Photometric measurement with the WINLAB Data Line photometer gives you continuous measured values in the entire range from 0.02 to 0.7 mg/l with high precision.
Number of possible provisions
You can carry out 150 measurements with one CALDUR® Chromium test set.
This refers to the quantity of reagents contained.
Measuring accuracy and reproducibility
Readability: Continuous (photometric)
Reproducibility: Very good if the application instructions are followed
Interference: High concentrations of iron or mercury can influence the result. Strongly colored or cloudy samples should be pre-filtered.
What to do if measured values are out of range?
Measured value > 0.7 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 < 0.02 mg/l
The measured value is below the detection limit. This is generally not critical and indicates that the chromium concentration is very low (water is harmless with regard to chromium).
Specifications at a glance
Reagents (reagent A, reagent B)
| Property | Value |
|---|---|
| Parameters | Chromium VI (Cr VI) |
| Item number | 31-073282 |
| Method | Photometric (diphenylcarbazide) |
| Measuring principle | Photometric measurement with WINLAB Data Line Photometer |
| Measuring range | 0.02 to 0.7 mg/l Cr VI |
| Measuring levels | Continuous (0.02 / 0.05 / 0.1 / 0.2 / 0.5 / 0.7 mg/l) |
| Duration of analysis | 5 minutes |
| Number of provisions | 150 |
| Packaging | Plastic bag or refill pack |
| weight | approx. 100 g |
| Scope of delivery |
|---|
| 2 reagent bottles (reagent A, reagent B) with detailed labeling |
| 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 (acid) | 30 ml | 24 months (24M) | Shake before use |
| Reagent B (diphenylcarbazide) | 25 ml | 24 months (24M) | 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 |
|---|
Flyer
Operating instructions
Instructions for use
Instructions for use
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