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3

III. 

III. 

III. 

III. 

III.  Theory of Operation

Theory of Operation

Theory of Operation

Theory of Operation

Theory of Operation:::::

The HI 4007 or HI 4107 chloride electrodes are potentio-
metric devices used for the rapid determination of free chlo-
ride ions in ground water, boiler water and drinking water.
The electrode functions as a sensor or ionic conductor.  The
HI 4007 requires a separate reference electrode to complete
its electrolytic circuit.  The HI 4107 has a reference electrode
incorporated in its design. The silver chloride pellet is prac-
tically insoluble in the test solutions being measured and
produces a potential change due to changes in the sample’s
ion activity. When the ionic strength of the sample is fixed
by the addition of ISA, the voltage is proportional to the
concentration of chloride ions in solution and the electrode
follows the Nernst equation.

E= E

a   

+ 2.3 RT/nF log A 

ion

E= observed potential

E

a

= Reference and fixed internal voltages

R= gas constant (8.314 J/K Mol)

n=  Charge on ion  (-1)

i

=ion activity in sample

T= absolute temperature in K

F= Faraday constant (9.648 x 10

4  

C/equivalent)

Содержание HI 4107

Страница 1: ...HI 4007 HI 4007 HI 4007 HI 4007 HI 4007 HI 4107 HI 4107 HI 4107 HI 4107 HI 4107 Chloride Ion Selective Electrode Instruction Manual CHLORIDE HI 4007 HI 410 COMBINATION 7 CHLORIDE Half cell Combinatio...

Страница 2: ...utions The HI 4007 is a solid state half cell sensor that requires a separate reference The HI 4107 is a combination ion selective electrode II II II II II Specifications Specifications Specifications...

Страница 3: ...asareferenceelectrode incorporated in its design The silver chloride pellet is prac tically insoluble in the test solutions being measured and producesapotentialchangeduetochangesinthesample s ion act...

Страница 4: ...4107 Design elements of the HI 4007 and HI 4107 Design elements of the HI 4007 and HI 4107 electrodes electrodes electrodes electrodes electrodes CHLORIDE HI 4007 Cap Sensing Membrane Sensor Handle U...

Страница 5: ...lutions Required Solutions Required for Chloride Measurements for Chloride Measurements for Chloride Measurements for Chloride Measurements for Chloride Measurements Select appropriate Hanna Instrumen...

Страница 6: ...libration standards and sample solutions should have the same ionic strength ISA acetate buffer or oxidizing reagent should be added to both samples and standards in the same ratio Calibration standar...

Страница 7: ...ing normal use fill solution will slowly drain out ofthetaperedconejunctionatthelowerportionofthe electrode Excessiveloss 4cmdropwithin24hours isnotnormal Ifthisoccursverifycapistightenedand the inter...

Страница 8: ...m seal found over ceramic junction on inner stem and discard This is only used for ship ping and long term storage 2 Rinseinnerstemwithdeionizedwatermakingcertain to wet the o ring found on the inner...

Страница 9: ...verify elec trodereturnstoitsoriginalposition Youmayneedto gently assist for this to occur 7 Tighten the electrode cap onto the body and fill elec trode body until fill solution volume is just below f...

Страница 10: ...action Corrective action Corrective action Corrective action Corrective action Verify protective cap has been removed HI 4007 Verify plastic film has been removed from inner stem HI4107 Verify electr...

Страница 11: ...he meter is calibrated with two or more freshly made stan dards that are in the linear measurement range of the unknowns Morecalibrationstandardsarerequiredinnon linear regions Unknowns are read direc...

Страница 12: ...ements using the oxidizing reagent must be made 10 minutes after mixing and not permitted react longer 3 Follow sectionVII GeneralGuidelinestooptimizetest set up 4 Duringcalibrationitisbesttostartwith...

Страница 13: ...mplifies the method greatly Example Chloride ion determination with known addition 1 A 50 mL sample of unknown Vsample is placed in a clean plastic beaker with a chloride sensor Add 2 mLofacetatepHbuf...

Страница 14: ...r See Section VI Titration Titration Titration Titration Titration XIV S XIV S XIV S XIV S XIV Storage and Care of the HI 4007 and torage and Care of the HI 4007 and torage and Care of the HI 4007 and...

Страница 15: ...s Conversion tables Conversion tables Conversion tables Conversion tables For Cl For Cl For Cl For Cl For Cl Multiply by Multiply by Multiply by Multiply by Multiply by Moles L M to ppm mg L 3 500x104...

Страница 16: ...6 monthsfromdateofpurchasewhenusedfortheirintended purpose and maintained according to instructions If they failtoworkwhenfirstusedcontactyourdealerimmediately Damageduetoaccidents misuse misapplicat...

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