DR/2400
Zinc
Zinc_PP_Other_ZNC_Eng_Ody.fm Page 1 of 6
• 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.
Zinc
(Method 8009
Zincon Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater.
Powder Pillows
(0.01 to 2.00 mg/L)
Scope and Application: For water and wastewater; digestion is required for determining total zinc (see
Digestion on page 4); USEPA Approved for wastewater analyses**
** Federal Register, 45(105) 36166 (May 29, 1980).
1. Touch
Hach Programs.
Select program
780 Zinc.
Touch
Start.
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.
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.
Tips and Techniques
Powder Pillows Method 8009
Hach Programs
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