Hach DR/700 Procedures Manual page 449

CHROMIUM, HEXAVALENT
For water and wastewater
1,5-Diphenylcarbohydrazide Method* (Powder Pillows or
AccuVac Ampuls), USEPA accepted for reporting**
USING POWDER PILLOWS
1.
Install module
55.01
in a DR/700.
* Adapted from Standard Methods for the Examination of Water and Wastewater
**Procedure is equivalent to USGS method I-1230-85 for wastewater
2.
Press:
I/O
The display will show
550 nm
and module number
55.01
55-1
Method 8023
(0 to 1.000 mg/L Cr
3.
After 2 seconds,
the display will show
a program number,
the concentration
units and the zero
prompt. If necessary,
press the
UP ARROW
key until the lower
display shows
program number
55.01.1
6+
)