Methods - Orbeco SC450 Manual De Instrucciones

Methods

GB
Notes:
1. Pour the water sample into clean glass containers and analyze as soon as possible after
the sample is taken.
2. This method is intended for finished, chloraminated drinking water samples that have a
measurable combined (total) chlorine disinfectant residual. Samples where the
disinfectant residual has disappeared and exhibits a chlorine demand may produce low
ammonia test results. Blanks and ammonia standards analyzed without a disinfectant
residual must be prepared using high quality, reagent grade water.
3. For more accurate chloramine results, determine a reagent blank for each new lot of
reagent using deionized water in place of the sample. Substract the reagent blank value
from the final chloramine result.
4. Hold the bottle vertically and squeeze slowly.
5. Full color development & temperature
The reaction periods indicated in the manual refer to a sample temperature between
18° and 20°C. Due to the fact that the reaction period is strongly influenced by sample
temperature, you have to adjust both reaction periods according to the following table:
Sample temperature
in °C
5
10
16
20
23
25
Conversions:
Monochloramine:
mg/l NH Cl = mg/l Cl
2 2
mg/l N = mg/l Cl
2
Tolerance:
Monochloramine:
0 – 1 mg/l: ± 0.05 mg/l
1 – 2 mg/l: ± 0.1 mg/l
2 – 3 mg/l: ± 0.2 mg/l
3 – 4.5 mg/l: ± 0.3 mg/l
8
Reaction period in min
10
2.5
Ammonium:
· 0.726 mg/l NH
· 0.197 mg/l NH
Ammonium:
± 0.05 mg/l N
8
6
5
2
= mg/l N · 1.29
4
= mg/l N · 1.22
3
SC450_V1_11.2010