TEST INSTRUCTIONS - Geotech Environmental Equipment
TEST INSTRUCTIONS - Geotech Environmental Equipment
TEST INSTRUCTIONS - Geotech Environmental Equipment
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PROCEDURE<br />
1. Press and hold ON button until colorimeter turns on.<br />
2. Press ENTER to start.<br />
3. Press ENTER to select <strong>TEST</strong>ING MENU.<br />
4. Select ALL <strong>TEST</strong>S (or another sequence containing 98 Turbidity)<br />
from <strong>TEST</strong>ING MENU.<br />
5. Scroll to and select 98 Turbidity from menu.<br />
6. Rinse a clean tube (0290) with deionized water (turbidity free). Fill to the<br />
10 mL line with deionized water.<br />
7. Insert tube into chamber, close lid and select SCAN BLANK.<br />
8. Rinse a second clean tube (0290) with sample water. Fill to the 10 mL line<br />
with sample. Cap tube. Wipe off excess water and fingerprints. Shake to<br />
resuspend particulate matter. Remove all bubbles before measurement.<br />
9. Insert tube into chamber, close lid and select SCAN SAMPLE. Record<br />
result. Turbidity measurements should be taken as soon as possible after<br />
sample has been collected.<br />
10. Press OFF button to turn colorimeter off or press EXIT button to exit to a<br />
previous menu or make another menu selection.<br />
NOTE: For the most accurate results, the sample should be at 25±4°C.<br />
PREPARING FORMAZIN SOLUTIONS<br />
The turbidity calibration was prepared by using standard formazin solutions as<br />
a reference. These solutions can be prepared by carefully following the<br />
procedure below.†<br />
1. Dissolve 1.000 g of Hydrazine Sulfate in deionized water and dilute to<br />
mark in 100 mL volumetric flask.<br />
2. Dissolve 10.00 g of Hexamethylenetetramine in deionized water and<br />
dilute to mark in 100 mL volumetric flask.<br />
3. Mix 5 mL of each solution in a 100 mL volumetric flask and allow to set<br />
undisturbed for 24 hours.<br />
4. At the end of the waiting period, dilute to mark with deionized water and<br />
mix.<br />
5. The turbidity of the stock solution is 400 FTU. The stock solution is<br />
stable for one month. Dilutions from the stock should be prepared fresh<br />
daily.<br />
†Alternatively, a prepared concentrated formazin standard of 4000 NTU may<br />
be ordered in a 60 mL size by Code 6195-H.<br />
Turbidity 2/2 Smart2 <strong>TEST</strong> PROCEDURES 2.04