Zinc - Hach DR2400 Manual

DR/2400
(
Method 8009
Powder Pillows
Scope and Application:
Digestion on page 4); USEPA Approved for wastewater analyses**
* Adapted from Standard Methods for the Examination of Water and Wastewater.
** Federal Register, 45(105) 36166 (May 29, 1980).
Tips and Techniques
®
• Caution! ZincoVer 5 Reagent contains cyanide and is very poisonous if taken internally or if fumes are inhaled. Do not add to an
acidic sample (pH < 4).
• Use only glass-stoppered cylinders in this procedure.
• Wash glassware with 1:1 HCl (Cat. No. 884-49) and rinse with deionized water before use.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• Use plastic droppers in this procedure. Droppers with rubber bulbs may contaminate the reagent.
• ZincoVer 5 reagent contains potassium cyanide. Cyanide solutions are regulated as hazardous wastes by the Federal RCRA.
Cyanide should be collected for disposal as a reactive (D003) waste. Be sure that cyanide solutions are stored in a caustic
solution with pH >11 to prevent release of hydrogen cyanide gas. See Section 4 for further information on proper disposal of
these materials.
Powder Pillows
Hach Programs
1.
Touch
.
Hach Programs
Select program
.

780 Zinc

Touch .
Start
Zinc_PP_Other_ZNC_Eng_Ody.fm
For water and wastewater; digestion is required for determining total zinc (see
2.
Fill a 25-mL
graduated mixing
cylinder with 20 mL of
sample.
3.
Add the contents of
one ZincoVer 5 Reagent
Powder Pillow to the
cylinder. Stopper.
Zinc
Zincon Method*
(0.01 to 2.00 mg/L)
Method 8009
4.
Invert several times
to dissolve the powder
completely. Inconsistent
readings may result for
low zinc concentrations if
all the particles are not
dissolved.
Note: The sample should be
orange. If the sample is brown
or blue, either the zinc
concentration is too high, or an
interfering metal is present.
Dilute the sample and repeat
the test.
Zinc
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