Thermo Products 9678BNWP manual Typical Redox Titration Methods Unknown Interferences

Page 14

Table 2– Typical Redox Titration Methods

Unknown

Interferences

antimony (Sb+3)

As, Fe, SO2, V, and organic

 

substances

 

 

arsenic (As+3)

other reducing agents

 

 

hydrogen peroxide

preservatives present in commercial

(H2O2)

H2O2 may interfere

hypochlorite ion (ClO¯)

Br2 and other oxidizing agents

or chlorine (Cl2)

interfere by liberating I2

 

 

iodine (I2)

other reducing agents

 

 

iodine (I2)

direct sunlight, high acidity, copper

 

salts and other catalysts promote air

 

oxidation and cause false high results

 

 

iron (as Fe+2, Fe+3

high levels of organic acids, such as

or in steel)

acetic, oxalic, tartaric, and alcohols;

 

F¯ if present in more than trace

 

amounts; Cl¯, PO4-3(remove by

 

adding acid)

 

 

iron (as Fe+2, Fe+3

other reducing agents

or in steel)

 

 

 

manganese (as

other oxidizing agents

permanganate Mn04¯)

 

manganese (as Mn+2)

other reducing agents

 

 

stannous tin (Sn+2)

other reducing agents

sulfur (as sulfur

S-2and SO2-2 , remove by shaking

dioxide SO2)

with CdCO3 and filtering

thallium (Ti+)

other reducing agents

 

 

thiosulfate ion

S-2and SO2 -2 , remove by shaking

(S2O3 -2)

with CdCO3 and filtering

uranium (as uranyl ion

other reducing agents

UO+2)

 

Zinc (Zn+2)

other reducing agents

 

 

12

Redox/ORP Electrode User Guide

Image 14
Contents User Guide Page Introduction Epoxy Refillable ORP/ATC Triode Cat. No Bnmd and 9180BNRequired Equipment Sample Requirements Electrode Preparation for Gel-Filled Electrodes Electrode PreparationElectrode Preparation for Refillable Electrodes Refillable ORP Electrode Electrode Calibration ORP Standard ValuesRedox/ORP Electrode User Guide Measurement Techniques Electrode Measurements Direct MeasurementsOxidation-Reduction Titrations References Typical Redox Titration Methods Unknown Interferences Suitable Titrants Titration Reaction Electrode Maintenance Cleaning Solutions Electrode Cleaning ProceduresGeneral Cleaning Sure-Flow Electrode Cleaning Cat. No Bnwp Disassembling the Sure-Flow ElectrodeLong-term Storage over one day Electrode StorageShort-term Storage up to one day Reassembling the Sure-Flow ElectrodeElectrode TroubleshootingMeter Sample/ApplicationAssistance Warranty Checking Electrode OperationOrdering Information Thermo Fisher Scientific