851 Titrando / 852 Titrando Top-class coulometers 851 Titrando and 852 Titrando extend and complete the Titrando family 02 The advantages of the new coulometers • Simultaneous coulometric and volumetric titrations with the 852 Titrando • Bromine index • Automatic start of titration • Automatic reagent exchange 03 Coulometric titrations with the 851 Titrando For trace concentrations (10 μg…10 mg absolute water content), coulometry is the ideal method for determining water in liquids, solids and gases. Furthermore, coulometry is an absolute method, so no titer determination is necessary. With the 851 Titrando coulometric titrations can be performed easily and quickly. 04 Coulometric and volumetric titrations with the 852 Titrando The 852 Titrando performs both coulometric and volumetric Karl Fischer titrations. If the water content of the samples is too high for coulometric determination, this is no obstacle for the 852 Titrando as this instrument is able to analyze samples with a water content ranging from a few micrograms to 100%. Using the tiamo TM soft ware both techniques can be applied simultane-ously. Bromine index The bromine index of a sample is a measure of the With the 851 and 852 Titrandos the bromine index can 05 number of double bonds that are present. Just as iodine be determined coulometrically. The determinations is produced in coulometric Karl Fischer titration, during require no further accessories − the indicator and gen-the determination of the bromine index bromine is pro-erator electrodes and the titration cell can also be used duced directly in the titration cell and reacts with the for this application. Only the working medium needs to double bonds. be changed. Schematic of a bromine addition reaction Automatic start of titration It can happen very quickly that the sample is put into the titration vessel before the titration has been started. In this case, conditioning continues until the water in the sample has reacted with the added iodine. Subsequent calculations are impossible and the measurement has to be repeated. With the 851 or 852 Titrando that can no longer happen. The instruments start the titration automatically as soon as sample is added. This means that you save reagents, sample and, above all, valuable time. Automatic reagent exchange − safe handling of toxic reagents 06 Using one of the four MSB ports, it is possible to connect Automation pays dividends! Dosinos and Dosing Units to the new coulometers. In this Increasing sample numbers, time-consuming sample way, the exchange of reagent can be automated, which preparation steps and unattended overnight operation means that the cell does not need to be opened, so no are good reasons for using sample changers. Combined moisture can get in. This shortens the conditioning times with the 814 USB Sample Processor, 815 Robotic USB after reagent exchange. Moreover, direct contact with Sample Processor XL and 874 USB Oven Sample Processor, toxic reagents is avoided. the Titrandos offer a high degree of automation. The reagent exchange can be triggered by way of the number of determinations performed, the age of the reagent, its water capacity or the drift value. Of course, Dosinos and Dosing Units are also used to add sample solutions, standard solutions or auxiliary solutions such as solubilizers. 07 Ordering information 2.851.0010 851 Titrando, generator electrode with diaphragm 2.851.0110 851 Titrando, generator electrode without diaphragm 2.851.0020 851 Titrando with Touch Control, generator electrode with diaphragm 2.852.0050 852 Titrando, generator electrode with diaphragm 2.852.0150 852 Titrando, generator electrode without diaphragm 2.852.0160 852 Titrando with Touch Control, generator electrode without diaphragm www.metrohm.com G, CH-9101Herisau ohm A witzerland by Metr , printed in S SW − 2010-04 1EN Subject to change Layout by Ecknauer+Schoch A 8.851.500