ORBECO SP600, Instruction Manual, Page: 135 / 334

133
SP600 Spectrophotometer 01/2008
1.1 Methods
Notes:
1. If the water sample is cloudy, you must filter it before performing the zero calibration.
2. The temperature of the water sample should not exceed 21°C.
3. Using the Hydrazine spoon: 1 g is equivalent to one level spoon.
4. Qualitative folded filter papers for medium precipitates are recommend.
5. In order to check whether the reagent has aged (if it has been stored for a lengthy
period), perform the test as described above using tap water. If the result is above the
detection limit of 0.05 mg/l, you should only use the reagent with reservations (major
result deviation).
6. There is an option to change the unit from mg/l to μg/l.
The unit mg/l is rounded, e.g.: 25 μg/l = 0.025 mg/l display 0.03 mg/l.
mg/l
μg/l