
31
SP600 Spectrophotometer 01/2008
1.1 Methods
Notes:
1. Strong alkaline or acidic water samples must be adjusted to approx. pH 7 before
analysis (use 1 mol/l Hydrochloric acid resp. 1 mol/l Sodium hydroxide).
2. If chlorine is known to be present, add one drop of 0.1 mol/l Sodium thiosulfate for each
0.3 mg/l Cl
2
in a one litre water sample.
3. Iron interferes with the test. The interferences will be eliminated as follows:
Determine the amount of total iron present in the water sample. Add an iron standard
solution with the same concentration to the vial (point 1) instead of deionized water to
produce the blank.
4. Conversion:
mg/l NH
4
= mg/l N x 1.29
mg/l NH
3
= mg/l N x 1.22
5. N
NH
4
NH
3
Содержание SP600
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Страница 231: ...229 SP600 Spectrophotometer 01 2008 1 1 Methods Notes 1 Only ortho Phosphate ions react 2 P PO4 P2 O5 ...
Страница 245: ...243 SP600 Spectrophotometer 01 2008 1 1 Methods Note 1 If Sulfate ions are present a cloudy solution will be given ...
Страница 249: ...247 SP600 Spectrophotometer 01 2008 1 1 Methods Notes 1 SO3 Na2 SO3 ...
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