YSI 9300 Photometer - Manual (Page 103)

SEPARATION OF RESIDUALS
The photometer is programmed for both zinc and the copper correction
procedure. Use program Phot 35 Zinc (+ Copper), then select the ‘Follow On’
option on screen to continue test for program Phot 36 Corrected Zinc. The
corrected zinc value is calculated automatically.
Test Procedure
1 Fill test tube to the 10 ml mark.
2 IN THE CASE OF CHLORINE CONTAINING SAMPLE ONLY :-
Add one Zinc-Dechlor tablet, crush and mix to dissolve.
3 Add one Zinc tablet, crush and mix to dissolve.
4 Allow the sample to stand for five minutes then mix again to ensure complete
dissolution of the indicator.
5 Select Phot 35 on photometer.
6 Take photometer reading in usual manner (see photometer instructions).
The result is displayed as mg/l Zn.
7 FOR COPPER CONTAINING SAMPLES ONLY :-
Continue the test on the same test portion. Select the ‘Follow On’ option on
screen to continue the test program.
8 Add one EDTA tablet, crush and mix to dissolve.
9 Take photometer reading in usual manner.
10 The photometer displays the corrected zinc concentration as mg/l Zn.
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