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11

       If dark deposits appears on polishing strip move the

paper slightly and continue polishing.

If the sensor slope just misses the suggested slope
window, soaking the sensor in a standard may solve
the problem.

If the membrane is damaged, the response becomes
extremely sluggish, or the slope of the electrode has
decreased significantly, and procedures above have
not helped, the sensor  should be replaced.

XI.   

XI.   

XI.   

XI.   

XI.   Direct Calibration and Measurement

Direct Calibration and Measurement

Direct Calibration and Measurement

Direct Calibration and Measurement

Direct Calibration and Measurement

This method is a simple procedure for measuring many
samples. A direct reading ISE meter (HI 4222 or equiva-
lent) determines concentration of the unknown by a direct
reading after calibrating the meter with the standards. The
meter is calibrated with two or more freshly made stan-
dards that are in the linear measurement range of the
unknowns.  More calibration standards are required in non-
linear regions.  Unknowns are read directly.  At very low
levels of chloride, special precautions must be employed for
reproducible measurements.  Water used for standards must
be chloride free and sensors and glassware must be rinsed
repeatedly with this water to prevent carry over. In the
region where the electrode response appears curved, more
calibration  points are needed, and calibration will need to
be repeated more frequently.

A pH/mV meter in mV mode with semi log graph paper
may also be used.  Two or more freshly prepared standards
that are in the measurement range of the unknowns are
measured in mV mode on the meter.
These values are plotted on the semi-log paper and the
points are connected to form a straight-line curve. When
samples are measured, their mV values are converted to
concentration by following the mV to the concentration axis
on the semi-log plot.

Summary of Contents for HI 4107

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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