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9 ml of sodmm chloflde-hydroxylamme sulfate (64) to reduce the excess permanganate After a delay of at least 30 seconds add 5 ml of stannous sulfate (6 3) and ImmedIately attachthebottletotheaeratIonapparatus ContmueasdescflbedunderCalIbratIOn CalculatIOn 10 PrecIsIOn and Accuracy 10 1 In a smgle laboratory (EMSL), usmg an OhIO RIver composIte sample wIth a background mercury concentratIOn of 0 35 ug/1, spIked wIth concentratIOns of 1 0, 3 0 and 40 ug/1, the standard devIatIons were ±O 14, ±O 10 and ±O 08, respectIvely Standard devIatIOn at the 035 level was ±O 16 Percent recovefles at the three levels were 89,87, and 87%, respectIvely 10 2 In a Jomt EPAIASTM mterlaboratory study of the cold vapor techmque for total mercury m water, mcrements of organIc and morgamc mercury were added to natural waters Recovefles were determmed by dIfference A statIstIcal summary of thIS study follows Number of Labs True Values uglhter 021 027 051 060 34 41 88 96 Mean Value uglhter 0349 0414 0674 0709 341 381 877 910 Standard DeViatIOn ug/hter Accuracy as % Bias 76 80 82 77 82 79 79 78 11 0276 0279 0541 0390 149 1 12 369 357 -52 9 I 9 2 93 Determme the peak heIght of the unknown from the chart and read the mercury value from the standard curve Calculate the mercury concentratIOn m the sample by the formula AppendIX 11 1 WhIle the possIbIlIty of absorptIon from certam orgamc substances actually bemg present m the sample does eXIst, EMSL has not encountered such samples ThIS IS mentIoned only to cautIon the analyst of the possIbIlIty A SImple correctIOn that may be used IS as follows If an mterference has been found to be present (44), the sample should be analyzed both by usmg the regular procedure and agam under oXIdIzmg condItIOns only, H/1_ (UgHgm)( ug g - alIquot volume of alIquot m ml Report mercury concentratIons as follows Below 02 ug/1, <02, between 1 and 10 ug/1, one decImal, above 10 ug/1, whole numbers 1,000 ) 245 1-5 66 53 32 18 034 -71 -04PDF Image | Methods for Chemical Analysis of Water and Wastes
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