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24

pH, Water and Wastewater, 

continued

Method Performance

Precision

In a single lab using an ASTM Substitute Wastewater Standard, 
specification number D5905-96, and two electrodes with a 
single sens

ion

2, a single operator obtained a standard 

deviation of 0.004 pH. Each electrode was exposed to seven test 
solutions with no rinsing in between and with a default 
stability of 0.5 mV/min.

Interferences

Sodium error may occur in samples with pH 10 or higher. See 
Section 4.2 on page 48.

Summary of Method

Water with relatively high conductivity typically has a fairly 
high buffer capacity. Slight pH changes due to absorption of 
carbon dioxide are usually not significant. If the sample 
conductivity is not known and high accuracy is desired, follow 
either the LIS or high purity methods.

The Platinum Series Combination pH Electrode responds to the 
hydrogen ion concentration (activity) by developing an 
electrical potential. At a constant temperature, this potential 
varies linearly with the pH of the solution being measured. The 
electrode has a free-diffusion junction that eliminates clogging 
problems and has been proven to provide fast, accurate results.

Содержание 51910-00

Страница 1: ...Cat No 51910 88 PLATINUM SERIES pH ELECTRODE Hach Company 1999 2002 All rights reserved Printed in China te dk 02 05 2ed...

Страница 2: ...2...

Страница 3: ...mple Chamber Kits 14 1 6 2 Sample Bottles 15 1 7 General Applications 15 Section 2 Applications 17 pH Water and Wastewater 19 pH High Purity Water 27 pH Low Ionic Strength LIS Water 35 Section 3 Elect...

Страница 4: ...4...

Страница 5: ...C 32 to 113 F Occasional Use 0 to 100 C 32 to 212 F Storage 40 to 50 C 40 to 122 F Reference Half Cell Ag AgCl 2 2 M KCl in 40 glycerol gel Dimensions Tip Diameter 12 3 mm 0 485 inches Tip Length 116...

Страница 6: ...6...

Страница 7: ...ion If multiple hazards exist this manual will use the signal word Danger Caution Note corresponding to the greatest hazard DANGER Indicates a potentially or imminently hazardous situation which if no...

Страница 8: ...8...

Страница 9: ...te pH measurement Figure 1 sension Platinum Series pH Electrodes Platinum Series pH Electrode with Temperature Probe for use with sension pH meters Cat No 51910 00 Platinum Series pH Electrode with Te...

Страница 10: ...electrode a frit restricts the release of electrolyte into the sample In the Platinum Series electrodes the medium viscosity electrolyte gel acts as a restriction device Fresh reference electrolyte i...

Страница 11: ...e 2 Assembling the Platinum Series Electrode Note The electrode will be automatically primed by screwing the dispenser unit onto the electrode body 3 If electrolyte gel is not visible at the reference...

Страница 12: ...layer electrodes should be conditioned for several minutes in a solution comparable to the sample in terms of pH and ionic strength Some samples may require special conditioning See specific applicat...

Страница 13: ...the dispenser until fresh gel emerges and carefully rinse the electrode to prevent sample contamination 1 4 Measuring Hints These suggestions will improve the accuracy of your calibration and sample m...

Страница 14: ...curate measurements than a single point calibration 1 5 Checking the Slope After calibrating the electrode with fresh buffer check the slope using the sension meter s calibration review option A slope...

Страница 15: ...include Monitoring the pH of low ionic strength liquids such as boiler feedwater and condensate Environmental and ecological studies of natural waters such as lakes rivers precipitation and streams W...

Страница 16: ...16...

Страница 17: ...17 Section 2 Applications...

Страница 18: ...18...

Страница 19: ...ure contains instructions for the sension 2 However any Hach sension meter may be used for this analysis 2 Prime the electrode by pushing the dispenser button until gel comes out of the reference junc...

Страница 20: ...ggle to the number of desired decimal places then EXIT to leave setup 6 In three 50 mL beakers or cups prepare buffers of 4 0 7 0 and 10 0 pH Note The sample pH should fall within the range of the cal...

Страница 21: ...n deionized water and blot dry 9 Place the electrode in pH 7 0 buffer Press ENTER The display shows Stabilizing Note Temperature variation causes changes in buffer pH Hach sension meters correct for t...

Страница 22: ...the electrode in the 4 0 or 10 0 pH buffer Press ENTER 12 After the last calibration point has stabilized and the display reads Standard 3 press EXIT For a three point calibration repeat steps 10 11 w...

Страница 23: ...3 mV per pH unit Checking Calibration Accuracy Returning the electrode to a calibration buffer and determining the pH provides a good test of the system Rinse and recondition the electrode before meas...

Страница 24: ...ge 48 Summary of Method Water with relatively high conductivity typically has a fairly high buffer capacity Slight pH changes due to absorption of carbon dioxide are usually not significant If the sam...

Страница 25: ...lue 15 pkg 22271 95 Buffer Solution pH 4 red 500 mL 22834 49 Buffer Solution pH 7 yellow 500 mL 22835 49 Buffer Solution pH 10 blue 500 mL 22836 49 Singlets pH 4 01 7 00 10 pkg 27699 20 Singlets pH 7...

Страница 26: ...26...

Страница 27: ...age 10 for assembly instructions Note The Hach sension 4 meter is used for this analysis 2 Prime the electrode by pushing the dispenser button until gel comes out of the reference junction Rinse exces...

Страница 28: ...o the number of desired decimal places then EXIT to leave setup 6 In three 50 mL beakers or cups prepare buffers of 4 0 7 0 and 10 0 pH Note The sample pH should fall within the range of the calibrati...

Страница 29: ...ode in deionized water and blot dry 9 Place the electrode in pH 7 0 buffer Press ENTER The display shows Stabilizing Note Temperature variation causes changes in buffer pH Hach sension meters correct...

Страница 30: ...ding using default meter parameters and the specified resolution To override the default meter parameters see the sension4meter manual 11 Place the electrode in 4 0 or 10 0 pH buffer Press ENTER 12 Af...

Страница 31: ...er Prime the reference junction by clicking the pump until fresh gel emerges 16 Rinse the electrode with deionized water or sample and blot dry 17 Place the electrode into the clean LIS Sample Chamber...

Страница 32: ...the inlet tube from the sample source to the sample chamber Note The inlet tube extends directly to the bottom of the sample chamber 20 Adjust inlet flow to slowly fill the chamber from the bottom up...

Страница 33: ...of pH 7 0 and two electrodes with a single sension 2 a single operator obtained a standard deviation of 0 05 pH Each electrode was exposed to seven test solutions with no rinsing in between and with a...

Страница 34: ...1 each 51899 00 OPTIONAL REAGENTS Buffer Powder Pillow pH 4 01 color coded red 15 pkg 22269 95 pH 6 86 15 pkg 14098 95 pH 7 00 color coded yellow 15 pkg 22270 95 pH 10 00 color coded blue 15 pkg 2227...

Страница 35: ...y instructions Note The Hach sension 2 meter is used for this analysis 2 Prime the electrode by pushing the dispenser button until gel comes out of the reference junction Rinse excess gel from the tip...

Страница 36: ...toggle to the number of desired decimal places then EXIT to leave setup 6 In three 50 mL beakers or cups prepare buffers of 4 0 7 0 and 10 0 pH Note The sample pH should fall within the range of the...

Страница 37: ...ectrode in deionized water and blot dry 9 Place the electrode in pH 7 00 buffer Press ENTER The display shows Stabilizing Note Temperature variation causes changes in buffer pH Hach sension meters cor...

Страница 38: ...e electrode in the 4 0 or 10 0 pH buffer Press ENTER 12 After the last calibration point has stabilized and the display reads Standard 3 press EXIT Note For a three point calibration repeat steps 10 1...

Страница 39: ...t dry 17 Fit the electrode into the clean LIS sample chamber lid and plug inlet and outlet ports with stoppers 18 If not using a sample collection bottle that fits the sample chamber transfer the samp...

Страница 40: ...standard solution of pH 7 1 and two electrodes with a single sension2 a single operator obtained a standard deviation of 0 006 pH Each electrode was exposed to seven test solutions with no rinsing in...

Страница 41: ...pkg 14098 95 pH 7 00 color coded yellow 15 pkg 22270 95 pH 10 00 color coded blue 15 pkg 22271 95 Buffer Solution pH 4 red 500 mL 22834 49 Buffer Solution pH 7 yellow 500mL 22835 49 Buffer Solution p...

Страница 42: ...42...

Страница 43: ...easuring a new sample refresh the reference electrolyte gel by clicking the dispenser until fresh gel emerges Carefully rinse the electrode to prevent sample contamination Overnight storage Store the...

Страница 44: ...trode storage solution Cat No 27565 49 3 2 Cleaning the Electrode A contaminated glass bulb or fouled electrode may cause slow response times Clean the electrode only after conducting the steps descri...

Страница 45: ...ough them If the electrode has been sitting in a sample for several weeks the reference gel will become diluted In this case discard the cartridge and replace it with a fresh one If these steps fail t...

Страница 46: ...46...

Страница 47: ...at the glass liquid interface At a constant temperature this potential varies linearly with the pH of the solution being measured The change in potential per pH unit is the slope of the electrode The...

Страница 48: ...ted with the reading at the indicated sodium concentration Note For indicated readings below pH 11 sodium error is negligible for solutions with a sodium concentration below 0 1 M Example The meter in...

Страница 49: ...h a lint free cloth or compressed air Reference junction is blocked Press the electrolyte dispenser and see if gel is expelled from the reference junction tube If the junction is blocked see Section 1...

Страница 50: ...t The pH cable though shielded can act as an antenna Install a shorting cap on the unused meter terminal Do not use stirrers in LIS solutions Avoid static electricity nearby pumps power supplies etc p...

Страница 51: ...ds Keep sample and standards at same temperature Standards contaminated Prepare fresh standards High offset Leakage pathway results in stray voltage via internal electrical short Return electrode unde...

Страница 52: ...52...

Страница 53: ...g stored between uses 10 What is the electrode slope during a typical calibration 11 If a new electrode has it been conditioned according to instructions 12 If the electrode has been in use for a whil...

Страница 54: ...54...

Страница 55: ...ydroxyl OH ions Anion A negatively charged ion i e NO3 Cl Base A chemical compound that contributes hydroxide ions OH to an aqueous solution or causes the pH to be greater than 7 0 Buffer 1 A compound...

Страница 56: ...or the sample before dilution Electrolyte A solution made of dissolved ions that is used to facilitate electrical conductance and ionic transport The composition is usually potassium chloride KCl sodi...

Страница 57: ...e hydrogen ion concentration Potential The capacity of a system to perform work When two ions of opposite charge are separated by a distance there is a potential developed from the tendency of the ion...

Страница 58: ...entimeter mS cm and it is a measure of how readily a sample conducts electricity More concentrated solutions conduct more electricity and have higher conductivity Sodium error alkaline error Occurs in...

Страница 59: ...At Hach Company customer service is an important part of every product we make With that in mind we have compiled the following information for your convenience 59 General Information...

Страница 60: ...60...

Страница 61: ...ic Rim Telephone 970 669 3050 FAX 970 669 2932 In Europe the Middle East or Mediterranean Africa HACH Company c o Dr Bruno Lange GmbH Willst tterstr 11 D 40549 D sseldorf Germany Telephone 49 0 211 52...

Страница 62: ...ephone 515 232 2533 FAX 515 232 1276 In Canada Hach Sales Service Canada Ltd 1313 Border Street Unit 34 Winnipeg Manitoba R3H 0X4 800 665 7635 Canada only Telephone 204 632 5598 FAX 204 694 5134 E mai...

Страница 63: ...LAR PURPOSE LIMITATION OF REMEDIES Hach shall at its option replace or repair nonconforming products or refund all amounts paid by the buyer THIS IS THE EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY LIM...

Страница 64: ......

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