LaMotte SMART Spectro Spectrophotometer - Manual (Page 164)

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 mL, glass, w/cap 0778
1 Pipet, 1.0 mL, plastic 0354
1 Pipet, 0.5 mL, plastic 0353
*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 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
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, sulfite and
thiosulfate. Interference due to silver is eliminated if chloride
is present.
SMART SPECTRO TEST PROCEDURES 05.04 Mercury 1/2