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CONDUCfANCE Method 120.1 (Specific Conductance, umhos at 25°C) STORET NO. 00095 1 Scope and ApplIcatIon 1 1 This method IS applIcable to drmkmg, surface, and salIne wates, domestIc and mdus- trial wastes and acid ram (atmosphenc depOSItIon) 2 Summary of Method 2 I ThespecIfIcconductanceofasampleISmeasuredbyuseofaself-contamedconductIvity meter, Wheatstone bndge-type, or equivalent 2 2 Samples are preferable analyzed at 25°C If not, temprature correctIons aremade and results reported at 25°C 3 Comments 3I Instrument must be standardized with KCI solutIon before dally use 32 ConductIvity cell must be kept clean 33 Field measurements with comparable mstruments are relIable 34 Temperature vanatlons and corrections represent the largest source of potential error 4 Sample HandlIng and Preservation 4 I Analyses can be performed either m the field or laboratory 4 2 If analysIs IS not completed wlthm 24 hours of sample collection, sample should be filtered through a 0 45 micron fIlter and stored at 4°C FIlter and apparatus must be washed with high qualIty distIlled water and pre-nnsed With sample before use 5 Apparatus 51 5 2 5 4 6 Reagents 6 1 Standard potassIUm chlonde solutions, 001 M Dissolve 07456 gm of pre-dried (2 hour at 105°q KCI m diStilled water and dIlute to 1 lIter at 25°C 7 Cell CalIbration 7 1 The analyst should use the standard potassIUm chlonde solutIon (6 1) and the table below to check the accuracy of the cell constant and conductIVity bndge Approved for NPDES Issued 1971 Edltonal reVISion, 1982 Conductivity bndge, range 1 to 1000 pmho per centimeter Conductivity cell, cell constant 1 0 or micro dlppmg type cell with 1 0 constant YSI #3403 or eqUivalent Thermometer 1201-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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