LaMotte SMART3 Colorimeter - Manual (Page 207)

MERCURY
TMK METHOD · CODE 4861
QUANTITY CONTENTS CODE
50 *TMK Tablets *4862-H
2 x 250 mL *Propyl Alcohol *4863-K
250 mL *Acetate Buffer *4864-K
1 Tablet Crusher 0175
1 Test Tube, 10 , glass, w/cap 0778
1 Pipet, 1.0 mL, plastic 0354
1 0.5 mL, plastic 0353
*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.
Mercury occurs in small amounts in soil, streams and groundwater. It is used in
the production of amalgams, mirror coatings and measuring devices such as
thermometers, barometers and manometers. Pharmaceuticals and paints contain
mercury. It is also used in fungicides and pesticides and as a mold retardant on
paper. Some forms of mercury are very toxic and can accumulate in the aquatic
food chain.
APPLICATION: Drinking and surface waters; domestic and industrial
wastewater.
RANGE: 0.00–1.50 ppm Mercury
MDL: 0.01 ppm
METHOD: Mercuric ions (Hg +2 ) form a colored complex with 4, 4’-
bis (dimethylamino) thiobenzophenone (Thio-Michler’s
ketone, TMK) at pH 3.
SAMPLE HANDLING
& PRESERVATION:
Analyze sample as soon as possible. If sample must be
stored, treat with HNO
3
to reduce th pH to less than 2
and store in a glass container.
INTERFERENCES: Palladium and other noble metals (gold, platinum,
rhodium, iridium, ruthenium), iodide and reducing
agents such as hydroxylamine hydrochloride, ascorbic
acid, sulfi te and thiosulfate. Interference due to silver is
eliminated if chloride is present.
SMART3 Test Procedures 11.10 MERCURY
Test P
rocedures