Lamotte SMART3 Colorimeter User Manual download pdf (Page 269)

POTASSIUM

TETRAPHENYLBORON METHOD • CODE 3639-SC

QUANTITY CONTENTS CODE

30 mL *Sodium Hydroxide, 1.0N *4004WT-G

5 g *Tetraphenylboron Powder *6364-C

1 Spoon, 0.05 g, plastic 0696

*WARNING: Reagents marked with an * are considered to be potential health

hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents go

to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or

fax.

Potassium, as the seventh most common element on the Earth, may be found in

minor quantities in most water supplies. It seldom exceeds 10 ppm in drinking water

and usually is less than 2 ppm. In some brine or runoff in agricultural areas the

potassium concentration may reach 100 ppm.

APPLICATION: Drinking, surface, and saline water.

RANGE: 0.0–10.0 ppm Potassium

MDL: 0.8 ppm

METHOD: Potassium reacts with sodium tetraphenylborate to form a

colloidal white precipitate in quantities proportional to the

potassium concentration.

SAMPLE HANDLING

& PRESERVATION:

Store samples in polyethylene bottles, not in soft glass

where leaching of potassium from the glass may occur.

Samples may be acidiﬁ ed to pH 2 with nitric acid, but

should be neutralized before analyzing.

INTERFERENCE: Calcium and magnesium interfere at very high

concentrations. Check for stray light interference (see p.

69).

SMART3 Test Procedures 2.11 POTASSIUM

Test Procedures

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Lamotte SMART3 Colorimeter User Manual Page 269