Hach-Lange LUMISTOX 300 LPV321 User Manual - Manual (Page 37)

LUMIStox 300 Operating Manual Dr. Bruno Lange GmbH
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Page: 37
4.2.3 Practical advice: Dilution series in conformity with DIN 38412
L34/341
The preparation corresponds to that of the geometrical dilution series.
Pipette into the measuring
cuvettes, in sequence:
2% NaCl solution
then prepared sample
Use a pipette to
transfer, proceeding
from left to right, 1.5 ml
into the following
cuvette. Mix each
sample dilution by
drawing it into the
pipette two or three
times.
There is no need to
change the pipette tip.
The 2% NaCl control
solution always stands in A1. The highest sample concentration, here the
undiluted sample, is on the far right, in this case A10.
NB: For a GL value in accordance with DIN, the preliminary dilutions of a toxic sample
must be carried out in accordance with the DIN dilution series. This means that a 1:8
preliminary dilution is allowed, but not 1:10. The accompanying Dr. Lange measuring
range table shows permissible preliminary dilutions of the original sample and the
resulting measurement ranges in the test.
1 ,5 1 ,5 1 ,5 1,5 1 ,5 1 ,5 1 ,5 1 ,5 1,0 0,0
1 .
1 ,5 2,0 1 ,5
2 .
3 .
1 ,5 1,5 1 ,5
4 .
1,5 1 ,5 1 ,5
m l
m l
m l
m l
=
d ilu tio n : 1 :
1 1 ,5 2 3 4 6 8 1 2 1 6