Chromium Cr(VI)/Cr(III)+Cr(VI)

• Drinking water
• Surface water
• Industrial wastewater discharge limit monitoring or process optimization

 The JAL-Z colorimeter is a compact analytical instrumentation for online analysis and process monitoring. The colorimeter is based on a color-developing chemical reaction carried out inside the analyzer's glass cell. The sample, coming from an external reservoir or process stream is autonomously grabbed by the instrument and mixed with the appropriate reagents to make the reaction happen. The analyzer uses an LED light source and a photodiode to photometrically measure the developed color intensity (absorbance). The absorbance is proportional to the concentration of the target chemical species (analite). 

•  Low reagents consumption and analytical reliability thanks to our custom designed miniature peristaltic pumps
• Dual compartment design to guarantee a complete separation between the electronics and the hydraulic section
• Color touchscreen to show the last measured value clearly, and to set all the options and settings via an user friendly interface
• Datalogger function with data history in graphical form and USB download
• Automatic calibration, validation and cleaning to reduce down time and operator intervention, their frequency can be freely set by the user
• Fully integrable in industrial automation via the analog outputs (2 x 4-20 mA channels), digital output (2 relays + ModbusRTU) and digital input (voltage free contact)

 The determination is based on the reaction of 1,5-diphenylcarbazide with Chromium(VI) in an acid medium. The absorbance intensity is proportional to the chromium concentration in the sample and is measured at 525 nm.  

Measured parameter:   Cr(VI)   

Range :

(Ø 26 mm)              0 - 300 ppb 

(Ø 16 mm)              0 - 1000 ppb 

(with dilution)    40 ppm   

 Reproducibility*

(Ø 26 mm)            ± 1 ppb / ± 5% (0-50 ppb), 

                                  ± 2 ppb / ± 5% (50-300 ppb) 

(Ø 16 mm)           ± 5 ppb / ± 5% (≥ 300 ppb)   

* if two values take whichever is greater

Limit of detection :    0.05 ppb   

Wavelength :    525 nm  

Demineralized water : Not required 

Reference :   ISO 11083:1994   

Number of reagents: 2

Min. analysis time : 8 minutes

Default analysis time : 15 minutes

Reagent consumption**

(Ø 26 mm)     1.5 L

(Ø 16 mm)     1 L 

** per month, at the default analysis frequency.

   The determination is based on the reaction of 1,5-diphenylcarbazide with Chromium(VI) in an acid medium. The absorbance intensity is proportional to the chromium concentration in the sample and is measured at 525 nm. 

Measured parameter:   Cr(VI)   

Range :

(Ø 26 mm)              0 - 600 ppb  

(Ø 16 mm)              0 - 2 ppm  

(with dilution)     80 ppm   

Wavelength :    572 nm  

Demineralized water : Not required 

Number of reagents: 2

Min. analysis time : 8 minutes

Default analysis time : 15 minutes

Reagent consumption**

(Ø 26 mm)     2 L

(Ø 16 mm)     1 L 

** per month, at the default analysis frequency.

    Chromium in the +3 oxidation state is oxidized to chromium(VI). All the chromium, now as Cr(VI) then reacts with 1,5-diphenylcarbazide, producing a pink color. The intensity of the color is proportional to the total chromium concentration in the sample and is measured at 525 nm. 

Measured parameter:   Cr(III)+Cr(VI) 

Range :

(Ø 26 mm)              2 ppm  

(Ø 16 mm)              4 ppm  

(with dilution)     150 ppm  

Wavelength :    572 nm  

Demineralized water : Not required 

Number of reagents: 3

Min. analysis time : 11 minutes

Default analysis time : 15 minutes