ABB Aztec 600 User Manual page 91

Aztec 600 aluminium, ammonia, color, iron, manganese, phosphate
Single- and multi-stream colorimetric analyzers
Chemical
Analyzer
Method
Aztec 600 Formaldoxime
Manganese
Aztec 600 Malachite
Manganese Green
Low Range
Aztec 600 Phosphomoly-
Phosphate bdenum Blue
Table C.2 Chemical Measurement Methods Used (Continued)
88
Principle of Measurement
Based on the red / orange complex formed
between formaldoxime and Manganese in a
suitably buffered solution.
Based on the malachite green triphenyl dye
which is formed in an oxidation reaction involving
manganese and leucomalachite green.
Based on the yellow complex formed between
molybdate and phosphate. The reducing agent
then modifies this complex
phosphomolybdenum blue color.
1. Rinse cell with sample.
2. Bring in sample.
3. Measure background absorbance.
4. Bring in Buffer reagent.
5. Bring in formaldoxime color reagent.
6. Wait for 2 minutes.
7. Bring in Iron complexing reagent.
8. Mix with air.
9. Wait 5 minutes for color to develop.
10. Measure final absorbance.
1. Rinse cell with sample.
2. Bring in preconditioner to remove chlorine interference.
3. Bring in sample.
4. Wait for 30 seconds.
5. Measure background absorbance.
6. Bring in bring in buffer/oxidant.
7. Wait 5 minutes.
8. Bring in color forming reagent.
9. Mix with air.
10. Wait 3 minutes for color to develop.
11. Measure final absorbance.
1. Rinse with sample.
2. Bring in Acid Molybdate reagent.
to give the
3. Bring in sample.
4. Measure background absorbance.
5. Wait 1 minute 30 seconds.
6. Bring in reducing agent.
7. Mix with air.
8. Wait for 11 minutes for color to develop.
9. Measure final absorbance.
Appendix C – Principle of Operation
Analyzer Sequence
IM/AZT6CR–EN Rev. J