The HI96752 Calcium and Magnesium Portable Photometer combines accuracy and ease of use in an ergonomic, portable design. A user can accurately determine the calcium and magnesium concentrations of water samples using ready made reagents. The HI96752 offers many advanced features including the exclusive CAL Check™ function used for performance verification and calibration of the meter.
The HI96752 portable photometer is for the measurement of calcium and magnesium. Hanna’s portable photometers feature an advanced optical system; the combination of a LED light source, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The Hanna exclusive CAL Check™ feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.
CAL Check™ – Allows for performance verification and calibration of the meter using NIST traceable standards.
GLP – Review of the last calibration date.
Auto-shut off – Automatic shut off after 10 minutes of non-use when the meter is in measurement mode. Prevents wastage of batteries in the event the meter is accidentally left on.
Battery status indicator – Indicates the amount of battery life left.
Built-in timer – Display of time remaining before a measurement is taken. Ensures that all readings are taken at the appropriate reaction intervals for the test being performed.
Error messages – Messages on display alerting to problems including no cap, high zero, and standard too low.
Cooling lamp indicator – To maintain the desirable wavelength to be used for absorbance, it is necessary to ensure components are not overheated from the heat generated by the tungsten lamp. Each photometer is designed to allow a minimal amount of time for components to cool. The cooling lamp indicator is displayed prior to a reading being taken.
Units of measure – Appropriate unit of measure is displayed along with reading.
Significance of use
Calcium and magnesium both play important roles in the growth of plants. Calcium helps plant roots develop and increases the resistance and strength of plant tissues and stems. Magnesium is an indispensable mineral that helps in the production of chlorophyll, the light-absorbing green pigment that serves as an energy source for plants. It also increases vitamin concentrations and aids in uptake of phosphorus within the plant body.
The HI96752 offers multiple methods within one meter. Calcium determination uses the oxalate method; magnesium determination uses the calmagite method. The ready made reagents are in liquid form. When the appropriate reagents are added to the sample, a color change will occur due to the presence of calcium or magnesium; the greater the concentration, the deeper the color. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. For determination of both calcium and magnesium, a narrow band interference filter at 466 nm (blue) allows only blue light to be detected by the silicon photodetector and omits all other visible light emitted from the LED. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.
CAL Check™ standards with certificate
The CAL Check™ standards are used for calibration and performance verification of photometers with the CAL Check™ function. Individual sets of CAL Check™ standards are available for each parameter on the HI96752:
- Calcium: HI96752-11
- Magnesium: HI96754-11
Supplied with Certificate of Analysis
- Lot number
- Expiration date
- Standard value @ 25 °C
- Reference meter NIST traceable
Provided storage containers
- Light tight
- Protects from accidental breakage