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79 <br />procedures which have been suggested have allowed us to use <br />the electrode for 4 years without replatinizing. Some sug- <br />gestions concerning the measurement of conductance are given <br />below: <br />1. Frequently check the accuracy of your conductivity <br />cell by measurement of the conductance of a standard KC1 <br />solution such as that given in the instrument manual or <br />that given in Table VII. <br />2. A conductivity meter and cell which can take tem- <br />perature measurements is worthwhile. In most instances, <br />it is quite difficult to make a precise temperature measure- <br />ment with a thermometer. The thermistor devices will be <br />precise. This_is._important since water temperature changes <br />of ±20C in some effluent streams are quite significant. <br />• However water temperatures is measured, it is important to <br />use the same device and method all the time to achieve con- <br />sistent results. <br />3. To compare conductivities of different waters, the <br />values have to be adjusted to the same temperature. The <br />adjustment factors given in Table VII for a 0.01M solution <br />of KC1 are suitable for this purpose. <br />4. When taking a conductivity reading, make sure the <br />cell is totally immersed so that the proper solution flow <br />and contact is maintained around the electrodes. If this <br />is not done, the reading will typically fluctuate considerably. <br />Also, for temperature measurements the thermistor on the <br />probe can usually be seen on the top by the cable. Make <br />0 <br />