HI97749C is an advanced portable photometer for the measurement of chromium (VI) in water. This meter offers a superior optical system that utilizes a reference detector and narrow band interference filters for extremely fast and repeatable measurements.
- No warm up time before taking a measurement
- Tutorial mode for step-by-step instructions
- CAL Check to verify meter performance
Hexavalent chromium salts are used in various industrial applications, such as in the manufacture of paints, dyes, explosives, and ceramics, and extensively in the metal finishing and plating industries. Due to its toxicity to humans, animals, and aquatic life, hexavalent chromium is actively monitored and neutralized in wastewater from the above industries.
The HI97749C uses an adaptation of the ASTM Manual of Water and Environmental Technology, D1687-92, diphenylcarbohydrazide method to measure chromium VI concentrations up to 1000 μg/L (ppb). When the diphenylcarbohydrazide reagent is added to samples containing chromium VI, the sample will turn a purple hue; 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 higher levels of chromium VI, a narrow band interference filter at 525 nm allows only green light to be emitted and passed through the sample cuvette. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.
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|Product Name||Chromium (VI) Low-Range Portable Photometer with CAL Check|
|Chromium, Hexavalent Range||0 to 300 μg/L (as Cr(VI))|
|Chromium, Hexavalent Resolution||1 μg/L|
|Chromium, Hexavalent Accuracy||±10 μg/L ±4% of reading at 25°C|
|Chromium, Hexavalent Method||adaptation of the ASTM Manual of Water and Environmental Technology, D1687 Diphenylcarbohydrazide Method|
|Photometer/Colorimeter Light Source||LED with 525 nm bandpass filter|
|Photometer/Colorimeter Light Detector||silicon photocell|
|Bandpass Filter Bandwidth||8 nm|
|Bandpass Filter Wavelength Accuracy||±1.0 nm|
|Cuvette Type||round 24.6 mm diameter (22 mm inside)|
|Display||128 x 64 pixel B/W LCD with backlight|
|Logging Memory||50 readings|
|Battery Type/Life||1.5 V AA Alkaline (3 pcs.) / > 800 measurements (without backlight)|
|Automatic Shut-Off||after 15 minutes of inactivity (30 minutes before a READ measurement)|
|Environment||0 to 50°C (32 to 122°F); 0 to 100% RH (IP67)|
|Weight||380 g (13.4 oz.)|
|Dimensions||142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0″)|
|Ordering Information||HI97749C is supplied with CAL Check standards, cuvettes (2), caps (2), plastic inserts for cuvette, (2), scissors, cuvette cleaning cloth, 1.5V AA batteries (3), instruction manual, and instrument quality certificate packaged in a rugged, thermoformed carrying case.|