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Mercury
Sample Collection and Preservation
Accuracy Check
Mercury
Page 8 of 12
Ion or Substance
+
Ag
+3
Al
+3
Au
+2
Cd
+2
Co
+6
Cr
+2
Cu
–
F
+2
Fe
+2
Hg
+6
Mo
+2
Ni
–
NO
–N
3
2+
Pb
SiO
2
+2
Zn
Collect 1000 mL of sample in an analytically clean, glass or polyethylene
terephthalate (PET) container. Add 10 mL of concentrated hydrochloric acid to
preserve the sample before sample collection. Fill the container completely full
to minimize air space when closed. Close a glass container with a ground glass
stopper. Close a PET container with a PET cap or a polypropylene cap (no liner).
Store aqueous samples at 2–6 °C. Acid-preserved samples are stable for at least
6 months.
Standard Additions Method
1. Prepare a 10.0-mg/L Mercury Standard Solution as described under Standard
Solution Method, Step 3a, below.
®
2. Use a TenSette
Pipet to add 0.10 mL of the 10.0-mg/L Mercury Standard
Solution to the purged solution in the Gas Washing Bottle after an analysis
has been performed. Immediately stopper the Gas Washing Bottle.
3. Begin at step 3 of Phase 2. Follow the procedure steps.
4. Test the eluate as described in Phase 3. The displayed concentration should be
0.9–1.1 µg/L Hg.
Standard Solution Method
1. Transfer 800 mL of deionized water into the Gas Washing Bottle.
2. Add 50 mL of concentrated sulfuric acid and 25 mL of concentrated nitric acid
to the water. Swirl to mix.
Concentration
+
7 mg/L Ag
+3
10 mg/L Al
+3
500 µg/L Au
+2
10 mg/ L Cd
+2
10 mg/L Co
+6
10 mg/L Cr
+2
10 mg/L Cu
–
1.0 mg/L F
+2
100 mg/L Fe
+2
1 µg/L Hg
+6
10 mg/L Mo
+2
10 mg/L Ni
–
50 mg/L NO
–N
3
2+
10 mg/L Pb
100 mg/L SiO
2
+2
10 mg/L Zn
Mercury_PP_Other_CVM_Eng_Ody.fm
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