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oa~is~et ia:zz 'O'eot ast 0120 ~sci vwrcota~lt »+» P x aces ®ooaio>.a <br />A S t 1 <br />In summary ,the total cyanide daft and any nlavant attendant notation to the data by <br />Aeeu-Labt, are as follows: <br />• ssmple 12/7 8/91: tool ryanlda 0.016 mp/L; 'Note: Duce to Ilmltad sample, Internal IL- <br />was not run.' <br />• aample 02/21/92: total eyanlde 0.010 mO/L: 'Sample 1 (L3W221) was roceivad past <br />holdlnp time Tor cyanide analysis,' <br />• aample 04/03/92: total tyanlda 0.011 mp/L, modified lacer to 0.006 mp/L. (A6CI nets: h <br />should be noted that no Intemal DA could be run on thit aample, due to the small sample <br />si:e). <br />3. TECHNICAL ISSUES AFFECTING DATA VALIDITY <br />The followlnp technical Issues, among others, have the potential of affectlnp the validity of <br />the total Cyanide analyfet Derformed on the limited volume of the samples eolleNed from <br />Iyslmeter L3: <br />• 1. sample tlxe; <br />• 2. prcservstion teehniqua; <br />• 3. absence of filtration of sample; <br />• 4, analytleat method: <br />• 6. absence of quellry assurance of analyses; and <br />• 8. absenes of estimation of the praeticel quantltatlon <br />limit, IPQLI, or a methotl tletaction Ilmlt study (MDL) of the analyses as eppliyd to these <br />types of ssmPles. <br />To a certain extent, some of these issues era interlinked and thara will be ^ modicum of <br />overlap in the rollowinp diseueaion of aaeh of the t.ehnic^I issues. <br />3.1 Sample Slsa <br />3.1.7 Standard sampling protocol for Cyanide <br />Standard sample Drotocol for cyanide determinatlons In aqueous media involves the <br />eollectlon o} a one Ilere aample In en amber glass bottle, held at a pH value of greeter than <br />pH 12 and detsrmtnad as noon as possible, but within fourteen dayt maximum of sampling. <br />To this end analytical laboratories provlda bottle Containing the appropriate amount of <br />preservation spent, usually alx to sight pellets of sodium hydroxide, for one litre Of sample. <br />