Thermo Fisher Scientific Ion Selective Electrodes Nitrate - Manual (Page 3)

Instruction Manual Nitrate Ion Electrode
1
EUTECH INSTRUMENTS PTE LTD
NITRATE ION ELECTRODE
INSTRUCTION MANUAL
GENERAL INSTRUCTIONS
Introduction
Eutech Instruments Nitrate Ion Electrode is used to measure nitrate in aqueous solutions quickly,
simply, accurately, and economically.
Required Equipment
1. A pH/mV meter or an ion meter, either power line or battery operated.
2.
Semi-logarithmic 4-cycle graph paper for preparing calibration curves when using the meter
in the mV mode.
3.
A magnetic stirrer.
4.
Eutech Nitrate Ion Combination Epoxy-body Electrode, Code no. EC-NO3-03.
Required Solutions
1. Deionized or distilled water for solution and standard preparation.
2.
Eutech Ionic Strength Adjuster (ISA), 2M (NH
4
)
2
SO
4
, Code no. EC-ISA-NT1-BT. To
prepare this solution from your own laboratory stock, half fill a 1,000 ml volumetric flask
with distilled water and add 264 grams of reagent-grade ammonium sulfate, (NH
4
)
2
SO
4
.
Swirl the flask gentle to dissolve the solid. Fill the flask to the mark with distilled water,
cap, and upend several times to mix the contents. ISA is added at the rate of 2 ml of ISA to
each 100 ml of standard or sample to adjust the ionic strength to about 0.12M.
3.
Eutech Nitrate Standard, 0.1M NaNO
3
, Code no. EC-SCS-NT1-BT. To prepare this solution
from your own laboratory stock, add 8.50 grams of reagent-grade sodium nitrate to a one
liter volumetric flask about half full of distilled water. Swirl the flask gently to dissolve the
solid. Fill to the mark with distilled water, cap and upend several times to mix the solution.
4. Eutech Nitrate Standard, 1,000 ppm NO
3
-1
, Code no. EC-SCS-NT2-BT. To prepare this
solution from your own laboratory stock, add 1.37 grams of reagent-grade sodium nitrate to
a one liter volumetric flask about half full with distilled water. Swirl the flask gently to
dissolve the solid. Fill to the mark with distilled water, cap and upend several times to mix
the solution.
5.
Eutech Nitrate Standard, 100 ppm NO
3
-1
as N, Code No. EC-SCS-NT3-BT. To prepare this
solution from your own laboratory stock, add 0.61 grams of reagent-grade sodium nitrate to
a one liter volumetric flask about half full with distilled water. Swirl the flask gently to