ORBECO SP600, Instruction Manual, Page: 25 / 334

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SP600 Spectrophotometer 01/2008
1.1 Methods
After reaction period is finished proceed as follows:
12. Place the vial (the blank) in the sample chamber
making sure that the marks are aligned.
13. Press ZERO key.
14. Remove the vial from the sample chamber.
15. Place the vial
(the sample)
in the sample chamber
making sure that the marks are aligned.
16. Press TEST key.
The result is shown in the display in mg/l Aluminium.
Notes:
1. Before using clean the vials and the measuring beaker with Hydrochloric acid
(approx. 20%). Rinse then thoroughly with deionized water.
2. To get accurate results the sample temperature must be between 20°C and 25°C.
3. A low test result may be given in the presence of Fluorides and Polyphosphates.
The effect of this is generally insignificant unless the water has fluoride added
artificially. In this case, the following table should be used:
Fluoride
[mg/l F] Displayed value: Aluminium [mg/l Al]
0.05 0.10 0.15 0.20 0.25 0.30
0.2 0.05 0.11 0.16 0.21 0.27 0.32
0.4 0.06 0.11 0.17 0.23 0.28 0.34
0.6 0.06 0.12 0.18 0.24 0.30 0.37
0.8 0.06 0.13 0.20 0.26 0.32 0.40
1.0 0.07 0.13 0.21 0.28 0.36 0.45
1.5 0.09 0.20 0.29 0.37 0.48 ---
Example: If the result of Aluminium determination is 0.15 mg/l Al and the Fluoride
concentration is known to be 0.4 mg/l F, the true concentration of Aluminium is
0.17 mg/l Al.
4. Al
Al
2
O
3
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST