SPECIFICATIONS
Method : Spectrophotometric (DR 2800)
Range : 2 to 250 mg/L as NO₂⁻
Testing time : 15 Minutes
DESCRIPTION
The method uses ferrous sulfate in an acidic medium to reduce nitrite to nitrous oxide. Ferrous ions combine with the nitrous oxide to form a greenish-brown complex in direct proportion to the nitrite present.
ORDERING INFORMATION
Order all replacement parts and reagents by their part numbers. To be sure this product is compatible with your treatment program.
SAFETY PRECAUTIONS
Refer to Material Safety Data Sheet (MSDS) for specific reagent personal safety and disposal information.
1. Touch:
Stored Programs
Select stored programs
373 N, Nitrite HR PP
Touch:
Start
2. Fill a sample cell with 10 mL of sample.
3. Add the contents of one NT-2 Reagent Powder Pillow, stopper and shake to dissolve(the prepared sample).
Note: A greenish-brown color will develop if nitrite is present.
4. Touch the TIMER icon.
A ten-minute reaction period will begin.
Note: It is critical to leave the sample undisturbed on a flat surface for the reaction period or low results may occur.
5. Fill another sample cell with 10 mL of sample (the blank).
6. When the timer beeps place the sample cell (blank) into the cell holder and close the cover.
7. Touch ZERO.
The display will show:
0.00 mg/L NO₂⁻
8. Gently invert the prepared sample twice. Place the prepared sample into the cell holder. Close the cover.
Note: Avoid excessive mixing because low results may occur.
9. Touch READ
The results in mg/L nitrite will be displayed.
Tidak ada komentar:
Posting Komentar