PCB (Polychlorinated Biphenyls)
PCB (Polychlorinated Biphenyls)
Page 8 of 10
PCB_None_Other_IMM_Eng_Ody.fm
Figure 2 The 1-cm MicroCuvette Rack
Loading the Rack — The cuvette rack is designed so that it may be inverted
with the cuvettes in place. Identify each cuvette with a sample or calibrator
number and place all the cuvettes in the rack before beginning the procedure. Fit
the cuvettes snugly into the rack, but do not force them or they may be difficult
to remove and their contents may spill. The cuvettes should remain in place
when the rack is inverted and tapped lightly.
Mixing — Set the rack on a hard, flat surface that is at least twice the length of
the rack. Hold the rack by one end and vigorously slide it back and forth along
its long axis for 30 seconds. The rack should move through a distance equal to its
own length in each direction.
Interpreting and Reporting Results
There is an inverse relationship between the concentration of PCB and the
reading. In other words, the higher the reading, the lower the concentration
of PCB.
Example
Readings:
1 ppm PCB Calibrator: 0.775 Abs
5 ppm PCB Calibrator: 0.430 Abs
Sample #1: 0.200 Abs
Sample #2: 0.600 Abs
Sample #3: 0.900 Abs
If the sample reading is… the sample PCB Concentration is…
…less than calibrator reading …greater than the calibrator concentration
…greater than calibrator reading …less than the calibrator concentration
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