Colorimetric Method Range
5-1000 micrograms NO2-N/L
Spectrophotometer Range
10-1000 micrograms NO2-N/L
Photometric Range with _____ cm light path & if this color filter is used
5-50 micrograms N/L; 5; GREEN
Color system obeys _____ Law up to 180 micrograms N/L with a _____ cm light path @ _____ nm
Beer's; 1; 543
pH range of the reddish purple azo dye produced for nitrite determination
2.0-2.5
Nitrite values can be obtained by the AUTOMATED method with this REDUCTION step omitted
Cu-Cd
The reddish purple azo dye is formed by coupling these 2 together
Diazotized sulfanilamide + NED dihydrochloride
This imparts a FALSE RED COLOR when color reagent is added
NCl3 (Nitrogen Trichloride)
Sb3+, Au3+, Bi3+, Fe3+, Pb2+, Hg2+, Ag+, chloroplatinate (PtCl6 2-), vanadate (VO3 2-)
9 Interferences that should be absent because of precipitation
This ion may cause LOW results by CATALYZING DECOMPOSITION of the diazonium salt
Cupric
NEVER USE THIS FOR PRESERVATION FOR NITRITE SAMPLES
ACID
For SHORT term preservation for 1 to 2 days, freeze at this temperature or store at 4 degrees C.
-20 degrees Celsius
Use the spectrophotometer at this this wavelength
543 nm
The FILTER PHOTOMETER should have a light path of _____ cm or longer with a _____ filter having a maximum TRANSMITTANCE near ______ nm
1; GREEN; 540
A RED color with DPD indicates:
PERMANGANATE
COLOR REAGENT is stable for 1 _____ when stored in a _____ bottle in refrigerator
MONTH; DARK
What is the titrant?
Standard potassium permanganate
Colorimetric Method Range
5-1000 micrograms NO2-N/L
Spectrophotometer Range
10-1000 micrograms NO2-N/L
Photometric Range with _____ cm light path & if this color filter is used
5-50 micrograms N/L; 5; GREEN
Color system obeys _____ Law up to 180 micrograms N/L with a _____ cm light path @ _____ nm
Beer's; 1; 543
pH range of the reddish purple azo dye produced for nitrite determination
2.0-2.5
Nitrite values can be obtained by the AUTOMATED method with this REDUCTION step omitted
Cu-Cd
The reddish purple azo dye is formed by coupling these 2 together
Diazotized sulfanilamide + NED dihydrochloride
This imparts a FALSE RED COLOR when color reagent is added
NCl3 (Nitrogen Trichloride)
Sb3+, Au3+, Bi3+, Fe3+, Pb2+, Hg2+, Ag+, chloroplatinate (PtCl6 2-), vanadate (VO3 2-)
9 Interferences that should be absent because of precipitation
This ion may cause LOW results by CATALYZING DECOMPOSITION of the diazonium salt
Cupric
NEVER USE THIS FOR PRESERVATION FOR NITRITE SAMPLES
ACID
For SHORT term preservation for 1 to 2 days, freeze at this temperature or store at 4 degrees C.
-20 degrees Celsius
Use the spectrophotometer at this this wavelength
543 nm
The FILTER PHOTOMETER should have a light path of _____ cm or longer with a _____ filter having a maximum TRANSMITTANCE near ______ nm
1; GREEN; 540
A RED color with DPD indicates:
PERMANGANATE
COLOR REAGENT is stable for 1 _____ when stored in a _____ bottle in refrigerator
MONTH; DARK
What is the titrant?
Standard potassium permanganate