2. Inde
x
1.Introduction. What are our objectives? What
we pretend?
2.Analytical process to determine Cr
3.Analytical process to determine Cl-
4.How can we package our product?
5.Roles of the members of group
3. objectives?
What we pretend?
QUICK TEST
➔ Quick cinetic reaction
➔ Known analytical process
➔ None heating requirement
➔ A limit value known
➔ Known the expiration of the components and the
requirements of this
4. Introduction. What are our
objectives?
What we pretend?
Sample with our
analyte with
unknown
concentration
A specific quantity
of moles that are
the necessary to
react with the
limit value
An indicator that
indicates qualitatively,
if you are above or below
the limit value
1 2 3
6. EQUIPMENT AND REAGENTS
1. Acid diphenylcarbazide (indicator solution)
2. Potassium dichromate (stock standard solution)
3. Deionised double distilled water
4. Spectrophotometer for VIS (540 nm) and spectrophotometer cells
5. Volumetric materials (calibrated flasks, beakers, pipettes...)
Analytical process to determine Cr(VI) in water
11. PROCESS
1. Prepare the solutions (as seen before)
2. Prepare the samples for the calibration curve
3. Let the samples stand for 10 min for color development
4. Measure the absorbance of the samples in the spectrophotometer at 540 nm
5. Trace the calibration curve by plotting the absorbance against the quantity of
Cr(VI) (in ppm)
Analytical process to determine Cr(VI) in water
12. PROCESS
2. Prepare the samples for the calibration curve
3. Let the samples stand for 10 min for color development
mL
30. How can we package our
product? Cl-
Potassium Chromate Silver Nitrate
Container High density polyethylene (glass ampoule) Container that does not let the light pass
Volume (mL) 1 1
31. How can we package our
product? Cr
Diphenylcarbazide Sulfuric acid 1:10 Ethyl alcohol
Container pill
Container that does not
let the light pass (glass)
High density
polyethylene
Volume
(mL)
0,0200 g 60 10
33. What we need for that?
● Good illumination
● A camera
● Database that have a relation between
colours and concentration
● A program that make it automatically
35. 5. Roles of the members of
group
- Lucía Mones Iglesias: Group coordinator, planning of
chloride analysis + laboratory work
- Eva Fernández Zapico: Planning of chrome analysis +
laboratory work
- Eva M. García Ibán: Planning of hardness of water +
laboratory work
- Alejandro Fernández: Laboratory work