LaMotte SMART Spectro Spectrophotometer - Manual (Page 254)

TURBIDITY
ABSORPTION METHOD • NO REAGENTS REQUIRED
Turbidity is a measure of water clarity and is independent of color. Turbidity
is caused by undissolved and suspended solids. Mud, silt, algae, and
microorganisms can all cause turbidity. Turbidity is a gross measurement of water
quality.
APPLICATION: Surface and industrial waters for non-compliance
monitoring. (For compliance monitoring at low turbidity
levels, use a commercial .)
RANGE: 0–400 FTU
MDL: 2 FTU
METHOD: Absorptimetric
SAMPLE HANDLING
& PRESERVATION:
Measure sample as soon as possible after collection.
INTERFERENCES: Check for stray light interference
PROCEDURE
Use universal sample holder.
1. Press and hold ON button until spectrophotometer turns on.
2. Scroll to and select PROGRAMMED TESTS.
3. Scroll to and select ALL TESTS (or another sequence containing
98 Turbidity) from TESTING MENU.
4. Scroll to and select 98 Turbidity from menu.
5. Rinse a clean tube (0290) with deionized water (turbidity free). Fill to the 10 mL
line with deionized water.
6. Insert tube into chamber, close lid and select SCAN BLANK.
7. Rinse a second clean tube (0290) with sample water. Fill to the 10 mL line with
sample. Cap tube. Wipe off excess water and fi ngerprints. Shake to resuspend
particulate matter. Remove all bubbles before measurement.
8. Insert tube into chamber, close lid and select SCAN SAMPLE. Record result.
Turbidity measurements should be taken as soon as possible after sample has
been collected.
9. Press OFF button to turn spectrophotometer off or press EXIT button to exit to
a previous menu or make another menu selection.
NOTE: For the most accurate results, the sample should be at 25±4°C.
SMART Spectro Test Procedures 09.14 TURBIDITY
Test P
rocedures