Lamotte SMART3 Colorimeter User Manual download pdf (Page 288)

PROCEDURE

1. Press and hold until colorimeter turns on.

2. Press

ENTER

to select TESTING MENU.

3. Select ALL TESTS (or another sequence containing 098 Turbidity) from

TESTING MENU.

4. Scroll to and select 098 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

to turn colorimeter off or press

EXIT

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.

PREPARING FORMAZIN SOLUTIONS

The turbidity calibration was prepared by using standard formazin solutions as a

reference. These solutions can be prepared by carefully following the procedure

below.†

1. Dissolve 1.000 g of Hydrazine Sulfate in deionized water and dilute to mark in

100 mL volumetric ﬂ ask.

2. Dissolve 10.00 g of Hexamethylenetetramine in deionized water and dilute to

mark in 100 mL volumetric ﬂ ask.

3. Mix 5 mL of each solution in a 100 mL volumetric ﬂ ask and allow to set

undisturbed for 24 hours.

4. At the end of the waiting period, dilute to mark with deionized water and mix.

5. The turbidity of the stock solution is 400 FTU. The stock solution is stable for

one month. Dilutions from the stock should be prepared fresh daily.

†Alternatively, a prepared concentrated formazin standard of 4000 NTU may be

ordered in a 60 mL size by Code 6195-H.

TURBIDITY SMART3 Test Procedures 11.10

Test Procedures

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Lamotte SMART3 Colorimeter User Manual Page 288