Download Test # 1: Removal of Fluoride from water Test objective: determine

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Transcript
Test # 1: Removal of Fluoride from water
Test objective: determine the amount of removed Fluoride
1. Identification of test method: Testing Fluoride concentration: Method 10225 – USEPA1
SPADNS 22. Using Fluoride test strip and DR 2700 spectrometer
2. Major goal:
Time to reach equilibrium
Amount of Fluoride is absorbed by bone char
Reduction of Fluoride. Initial Fluoride concentration is 8, 12, 15 or 20mg/L
3. Equipment:
a) BWM pre-filter device
b) Sodium Fluoride
c) Bone-char
d) Fluoride test strip
e) 100 ml flasks
f) Pipette
g) PR 2700 spectrometer
h) SPADNS 2 reagent
4. Sample preparation:
Fill out data sheet with test date and time
Make sure the BWM pre-filter is clean and dry and the filter mesh has been cleaned.
Fill the bucket with test water (Genesee river water)
Maintain at room temperature
Adding Sodium Fluoride as the following amount
8 mg F/L = 17.67 mg Sodium Fluoride
12 mg F/L = 26.51 mg Sodium Fluoride
15 mg F/L = 33.14 mg Sodium Fluoride
20 mg F/L = 44.19 mg Sodium Fluoride
Record the initial Fluoride range, pH, and temperature in data sheet
5. Constraints
Flow rate of water at 1.5m head is from 2L/min to 4L/min
6. Safety:
 Use gloves and proper hardware to transfer sodium Fluoride and other chemicals.
 Analysts should follow the lab rule while performing testing
7. Testing procedure:
 Prepare several samples with different volume (5, 2, 1 or 0.5 liter)
 Record the initial volume of testing water in data test sheet
 Adding sodium fluoride. See sample preparation for amount of sodium fluoride
needed
 Label each sample
 Use Fluoride test strip to measure the Fluoride concentration in each sample. The
concentration of Fluoride should be in the range of 8.009 ±0.5 ppm – 20.0228 ±0.5
ppm.
 Measure the pH value
 Record Fluoride concentration and pH value on the data test sheet
 Pipet SPADNS 2 reagent solution into the beaker. Follow Hach PR 2700 test
procedure for Fluoride concentration testing
 Add bone char into the bucket. The amount of bone char can vary from 10 to 50 mg.
Record the added amount of bone char
 Keep the sample in the bucket for a period of time ( 1 hour, 3 hours, 6 hours, 12 hours
or a day). Record the time on data test sheet.
 Use PR2700 spectrometer or Fluoride test strip to measure the Fluoride in water
again. Record the new value of Fluoride concentration on data test sheet. Record the
pH value. The acceptable Fluoride concentration must be less than or equal to 2.0
mg/L (2ppm)
Data test sheet for Fluoride
Sample #
date
int. amount
of F (mg )
Ini. F conc.
(mg/L)
int. volume
water (mL)
pH
Bone char
(mg)
Fin. F conc.
(mg/L)
1
2
3
4
5
6
Note:
a) Testing procedure might be changed upon the testing result and the amount of tested
water.
b) Water sample will have various level of Fluoride concentration and turbidity
c) Time for testing will be different with each testing procedure
pH
Time
8. Reference
 Fluoride testing method: Fluoride Test Kit Method: Thermo Orion Method AC2009.
Revision 5, 4/24/2002. Author: Thermo Fisher Scientific
 Fluoride: Method 10225 – USEPA1 SPANS 22. For water, wastewater, seawater. Hach
company
Similar
Product bulletin
Product bulletin
ST. PIUS X SCHOOL DENTAL EXAMINATION/ASSESSMENT
ST. PIUS X SCHOOL DENTAL EXAMINATION/ASSESSMENT