Nitrite (KSA 202 GRADE 2)

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