Thermo Fisher Scientific Ion Selective Electrodes Lead - Manual (Page 4)

EUTECH INSTRUMENTS PTE LTD.
LEAD ION ELECTRODE
INSTRUCTION MANUAL
GENERAL INSTRUCTIONS
Introduction
Eutech Instruments Lead Ion Electrode is used to measure lead or sulfate ions in aqueous solutions
quickly, simply, accurately, and economically.
Required Equipment
1. A pH/mV meter or an ion meter, either line operated or portable.
2.
Semi-logarithmic 4-cycle graph paper for preparing calibration curves when using the
meter in the mV mode. Linear graph paper is recommended for low level measurements or
lead/sulfate titration.
3.
A magnetic stirrer.
4.
Eutech Lead Ion Combination Epoxy-body Electrode, Code no. EC-PB-03.
6.
Lab-ware made of plastic, not glass, for all low level measurements.
7.
Polishing Paper, Code no. EC-MIS-PP, to polish dirty or etched electrode membranes.
Required Solutions
1. Deionized or distilled water for solution and standard preparation.
2.
Methanol-formaldehyde solution. To prepare this solution from your own laboratory stock,
add 3 drops of 37% formaldehyde to 1,000 ml of reagent-grade methanol. This solution is
used to decrease the solubility and retard oxidation of the membrane.
3.
Eutech Ionic Strength Adjuster (ISA), 5M NaClO
4
, Code No. EC-ISA-PB1-BT. To
prepare this solution from your own laboratory stock, half fill a one liter volumetric flask
with distilled water and add 700 grams of reagent-grade NaClO4·H2O. Swirl the flask
gently to dissolve the solid. Fill the flask to the mark with distilled water, cap, and upend
several times to mix the solution. To each 100 ml of standard or sample, add 2 ml of ISA.
The background ionic strength of the resulting solution will be 0.1M.
4.
Eutech Lead Perchlorate Standard, 0.1M Pb(ClO
4
)
2
, Code no. EC-SCS-PB1-BT. To
prepare this solution from your own laboratory stock, half fill a one liter volumetric flask
with distilled water and add 46.01 grams of reagent-grade lead perchlorate,