LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 47)

Field Test Method
The Direct Reading Titrators used in this procedure are calibrated so that the
test result is read directly from the scale on the Titrator in ppm Total
Dissolved Solids.
Quantity Contents Code
60 mL *TDS Reagent A *4802-H
60 mL *TDS Reagent B *4803-H
2 Resin Column 1079
15 mL Methyl Orange Indicator with Halidex 2299-E
2 Test Tube, 5-10-15 mL, glass, w/cap 0778
60 mL Deionized Water 5115PT-H
2 Direct Reading Titrators, 0-1000 Range 0384
1 Pipet, 1.0 mL 0354
*WARNING: Reagents marked with a * are considered to be potential health hazards.
To view or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD
or www.lamotte.com. To obtain a printed copy, contact LaMotte by email, phone or fax.
Read the LaMotte Direct Reading Titrator Manual before proceeding.
Procedure
1. Fill test tube (0778) to the 10 mL line with the sample water.
2. Add 3 drops of Methyl Orange Indicator with Halidex (2299). Cap and
mix.
3. Fill a Direct Reading Titrator (0384) with *TDS Reagent A (4802).
Insert the Titrator in the center hole of the test tube cap.
4. Add the *TDS Reagent A (4802) until the yellow color changes to pink,
swirling to mix after each addition. Read the test result directly from the
scale where the large ring on the Titrator meets the Titrator barrel. This
is result “A.” Discard this portion of the test sample and wash the test
tube.
The second part of the TDS test involves passing the sample through an ion
exchange column which exchanges the various cations (Na, Ca, Mg, etc.)
for hydrogen ions which are then titrated with *TDS Reagent B (4803)
(Standard Sodium Hydroxide Solution).
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