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9 CalculatIOn 8 10 TItnmetnc method 810 1 If the sample contams more than 1 mg!l of eN, transfer the dIstIllate or a 9 1 If the colonmetnc procedure IS used, calculate the cyantde, 10 ug/l, 10 the ongmal sample as follows eN, ug/I = A x 1,000 x 50 BC where A = ug CN read from standard curve B - ml of ongInal sample for dIstIllatIOn C = ml taken for colonmetrIc analysIs 8102 8.10 3 SUItablealIquotdIlutedto250ml,toa500mlErlenmeyerflask Add10-12drops of the benzalrhodanme mdlcator , TItrate wIth standard sIlver mtrate to the fust change m color from yellow to browmsh-pmk TItrate a dIstIlled water blank usmg the same amount of sodIUm hydroxIde and mdIcator as m the sample The analyst should famllIanze hImself WIth the end pomt of the tItratIOn and the amount of mdlcator to be used before actrally tItratmg the samples. 3352-6PDF Image | Methods for Chemical Analysis of Water and Wastes
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