Mercury
Mercury
Mercury_PP_Other_CVM_Eng_Ody.fm Page 11 of 12
The mercuric chloride is eluted off the column and a sensitive indicator is added.
The instrument is zeroed using the absorbance peak of the unreacted indicator.
A complexing agent is added to break the mercury:indicator complex. The
increase in unreacted indicator causes an increase in absorbance s proportional
to the amount of mercury in the original sample. Test results are measured at 412
nm.
Safety
Wear personal protective equipment such as safety glasses with side shields, or a
face shield to protect your eyes. Use other protective equipment as necessary
(such as a fume hood) to avoid chemical exposure. Perform all steps exactly as
prescribed in the procedure.
Pollution Prevention and Waste Management
Proper management and disposal of waste is the responsibility of the waste
generator. Hach Company provides waste disposal information as a guideline
only. It is up to the generator to arrange for proper disposal and comply with
applicable local, state, and federal regulations governing waste disposal. Hach
Company makes no guarantees or warranties, express or implied, for the waste
disposal information represented in this procedure.
1. Dispose of the solution in the Gas Washing Bottle by neutralizing the
solution to a pH of 6–9 and flushing to the sanitary sewer with water for
several minutes.
2. The mercury contained in one liter of sample is concentrated by a factor of 100
by the Mercury Absorber Column. Mercury analysis within the range of the
test may produce a solution in the sample cell that is above the RCRA Toxicity
Characteristic limit of 0.20 mg/L Hg. The sample cell will contain 0.25 mg/L
mercury if the original sample was at 2.5 µg/L mercury (the upper limit of the
test range). Dispose of the solution in the sample cell as a hazardous waste if
the test result was over 2 µg/L mercury in the original sample. Otherwise,
pour the solution into the sanitary sewer and flush with water for several
minutes.
3. The mercury scrubber will capture mercury vapor if the Mercury Absorber
Column is not properly activated using HgEx Reagent B and HgEx
Reagent C. In addition, mercury is also captured if the capacity of the
Absorber Column is exceeded. If the Mercury Scrubber has captured mercury
vapor, it must be disposed of according to applicable regulations.
Required Reagents
Quantity Required
Description Per Test Unit Cat. No.
Cold Vapor Mercury Reagent Set (25 tests) .................................................................................................26583-00
Includes:
HgEx™ Reagent A, Stannous Sulfate Solution, 20-mL ampules 1 ....................... 25/pkg...............26588-25
HgEx™ Reagent B, Sulfuric Acid Solution ....................................19 mL .............. 500 mL...............26589-49
HgEx™ Reagent C, Sodium Hypochlorite Solution .....................2 mL ................ 55 mL.................26590-59
HgEx™ Reagent 3, Alkaline Reagent Powder Pillows.................1 pillow........... 25/pkg...............26584-48
HgEx™ Reagent 4, Indicator Powder Pillows...............................1 pillow........... 25/pkg...............26585-48
HgEx™ Reagent 5, Sodium Hydroxide Solution ..........................8 drops............ 10 mL SCDB .....26586-36
HgEx™ Reagent 6, Complexing Reagent Powder Pillows..........1 pillow........... 25/pkg...............26587-48
Mercury Scrubber...............................................................................2/reagent set.. 2/pkg.................26558-00
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