Hach DR/850, Procedures Manual, Page: 447 / 460

447
Method 8009
ZINC
(0 to 3.00 mg/L Zn)
For water and wastewater
Zincon Method
*
USEPA approved for wastewater analysis
**
(digestion needed; see Section 2)
* Adapted from Standard Methods for the Examination of Water and Wastewater.
1.
Enter the stored
program number
for zinc (Zn).
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
2.
Press:
97 ENTER
The display will show
mg/L, Zn and the
ZERO icon .
Note: Total zinc requires a
prior digestion; use either
the Digesdahl or mild
digestion (Section 2).
Note: Adjust the sample to
pH 4-5; see Sampling and
Storage following
these steps.
3.
Fill a 25-mL sample
cell with 20 mL
of sample.
Note: Rinse glassware with
1:1 hydrochloric acid and
deionized water
before use.
Note: If samples cannot be
analyzed immediately, see
Sampling and Storage.
4.
Add the contents of
one ZincoVer 5 Reagent
Powder Pillow. Cap.
Invert several times to
completely dissolve the
powder. If the sample
does not turn orange, see
the note below.
Note: Powder must be
completely dissolved or
inconsistent results
may occur.
Note: The sample should
be orange. If it is brown or
blue, dilute the sample and
repeat the test. Either the
zinc concentration is too
high or an interference
is present.
** Federal Register , 45 (105) 36166 (May 29, 1980).
Caution: ZincoVer 5 contains cyanide and is very poisonous if
taken internally or inhaled. Do not add to an acidic sample.
Store away from water and acids.