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8. 9 10. Procedure 8.1 8 2 8.3 Follow the dIrection of the manufacturer for the operatIon of the mstrument Allow samples to come to room temperature (23 to 27°C), If possIble Determme the temperature of samples withm 0 5°C If the temperature of the samples IS not 25°C, make temperature correctIon m accordance WIth the mstructIOn m SectIon 9 to convert readIng to 25° CondUCtiVIty 0 01 m KCI °C Micromhos/cm 21 1305 22 1332 23 1359 24 1386 25 1413 26 1441 1468 28 1496 27 Calculation 9 I These temperature correctIOns are based on the standard KCI solutIOn 9.1 I IfthetemperatureofthesampleISbelow25°C,add2%ofthereadmgperdegree 9 I 2 If the temperature IS above 25°C, subtract 2% of the readmg per degree 9.2 Report results as SpecIfIc Conductance, J.lIllhos/cm at 25° PreelSlon and Accuracy 10.1 Forty-one analysts m 17 laboratorIes analyzed SIX synthetIc water samples contammg mcrements of morgamc salts, WIth the followmg results Increment as SpecIfic Conductance 100 106 808 848 1640 1710 PrecIsIon as Standard DeVIatIon BIas, % 755 -202 814 -076 661 -363 796 -454 106 -536 119 -508 Accuracy as (FWPCA Method Study 1, Mmeral and PhySIcal Analyses ) 102 In a smgle laboratory (EMSL) usmg surface water samples WIth an aV,erage condUCtIVIty of 536 J.lIllhos/cm at 25°C, the standard deVIatIOn was ±6 120 1-2 BIas, umhos/cm -20 -08 -293 -385 -879 -869PDF Image | Methods for Chemical Analysis of Water and Wastes
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