Analytical Method: Vanadium in water (Others)

Instruments and Reagents:

Cat.No. 173016  Spectroquant® VIS Spectrophotometer Prove 100 or

Cat.No. 173017  Spectroquant® UV/VIS Spectrophotometer Prove 300 or

Cat.No. 173018  Spectroquant® UV/VIS Spectrophotometer Prove 600 or

Cat.No. 109751  Spectroquant® Photometer NOVA 60 
Cat.No. 104936  Potassium chloride for analysis
Cat.No. 109057  Hydrochloric acid 1 mol/l
Cat.No. 100983  Ethanol for analysis
Cat.No. 116754  Water for analysis
2-Thiophen-carboxylic hydrazide, Aldrich Cat.No. T 3,261-1
Membrane filter 0.45 μm pore diameter
 
Reagent 1:
Dissolve 6 g 2-thiophen-carboxylic hydrazide in 40 ml ethanol.
 
Reagent 2:
Place 12.5 ml potassium chloride solution, 0.2 mol/l and 3.25 ml hydrochloric acid, 0.2 mol/l in a 50-ml volumetric flask and make up to the mark with water.
 
Measurement range:
0.50 - 5.00 mg/l V at cell length 10 mm and 405 nm
 
Sample preparation:
The sample solution must be clear; if not, filter through a folded filter or membrane filter with 0.45 μm pore diameter.

 
Analysis:
Mix 10.0 ml of sample solution, 0.25 ml reagent 1, 0.30 ml reagent 2 in a test tube. Measure against water at 405 nm.

 

Parameter list for programming the photometer Spectroquant® NOVA 60, NOVA 400, Pharo 100, and Pharo 300

Method number ----
Method-designation Vanadium
Wavelength 405 nm
Citation V
Units mg/l
Resolution 0.01
Zero point (E0) 0.000
Slope (E/C) 0.2188
Meas. range begin 0.50
Meas. range end 5.00
Reference cell 10 mm


Calculation when measuring the absorbance value using the above NOVA photometers without programming the method in the memory of the instrument:

Measured absorbance
of samples in A
Result in mg/l
[A sample * 1 / 0.2188]
1.000 4.57

 

Parameter list for programming the photometer SQ 118

 

01 Method V
02 Cat.No. -------
03 Measuring range 0.50 - 5.00
04 Units mg/l
05 Reaction time 0 0 min
06 Cell 10 mm
07 Wavelength 405 nm
08 Calibration Factor
09 Evaluation Linear
10 Factor 4.57

 

 
Calculation when measuring the absorbance value using the photometer SQ118 without programming the method in the memory of the instrument:

 

Measured absorbance
of samples in A
Result in mg/l
[A sample * 4.57]
1.000 4.57

 

Materials

     
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