Hach DR/700 - Page 746

81-72
SUSPENDED SOLIDS, continued
STATISTICAL EVALUATION
A single operator repetitively tested samples of two laboratory prepared
solutions, using one DR/700, matched sample cells and two
representative lots of reagents. Testing 325 mg/L Nonfilterable Residue
(Suspended Solids) samples the standard deviation was ±3 mg/L
Nonfilterable Residue (Suspended Solids).
SUMMARY OF METHOD
The photometric method of determining suspended solids is a simple,
direct measurement which does not require the filtration or ignition and
weighing steps necessary in gravimetric procedures. The stored
program has been calibrated using samples from a municipal sewage
treatment plant. The USEPA specifies the gravimetric method for solids
determinations, while the photometric method is often used for checking
in-plant processes.
REQUIRED APPARATUS
Quantity
Description Per Test Unit Cat. No.
Beaker, 600 mL, poly . . . . . . . 1 . . . . . . . . .each . . . . . . . . . . . 1080-52
Blender . . . . . . . . . . . . . . . . . . 1 . . . . . . . . .each . . . . . . .obtain locally
DR/700 Filter Module
Number 81.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46281-00
OPTIONAL APPARATUS
Cap for 10- and 25-mL sample cells. . . . . . .12/pkg . . . . . . . . 24018-12
Cylinder, 500 mL, graduated, poly . . . . . . . .each . . . . . . . . . . . 1081-49
Stirring Rod, glass. . . . . . . . . . . . . . . . . . . . . 3/pkg . . . . . . . . . . 1770-01
Sample Cell, 10-mL with screw cap . . . . . . . 6/pkg . . . . . . . . . 24276-06
Sample Cell, 25-mL with screw cap . . . . . . . 6/pkg . . . . . . . . . 24019-06
For Technical Assistance, Prices and Ordering
In the U.S.A. - Call 800-227-4224 toll-free for more information.
Outside the U.S.A. - Contact the Hach office or distributor serving you.