Hach-Lange LUMISTOX 300 LPV321 User Manual User 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

1,0

0,0

1 .

1 ,5

2,0

1 ,5

2 .

3 .

1 ,5

1,5

1 ,5

4 .

1,5

1 ,5

m l

d ilu tio n : 1 :

1 ,5

1 2

1 6