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Od/iJ/02 ld:2d A S C I 'a80d 08d 8128 ASCI VAtiCOUVER +++ P ]r HAS I~U09/014 The potential for such effects was partially ncopnised, albeit somewhat after the analysis, by Aeeu-Vbs. They downgraded their original estimate o} 0.011 mp/L cyanide to 0.006 mpJt., the dstettlon Ilmft for West soludons, W the Apr113, 1892 lyaimster eemple, It Ie believed, based on the sample maMx and elxe, that M any cyanide oeeufnd M rite lyaimster L3 samples, h could be neither detected nor quantified by the sutoanslyser technique at levels below a minimum of 0.02 mp/L. h is worth noting that this ie the quentitatlon Ilmit used by another Denver Isbontory for their autoanslyser eyanidY analysis, without accounting for seven matrix effects. 3.5 Abssnca of Dueliry Aasuranee 3.5.1 Laboratory DA procedures Quality aaeurence (DAI proceduraa are designed to estimate, account for end eIInllnat0 snalytieal error in the laboratory In the analytic of samples. This is achieved by arielysinp nplicetes of samples to assess reproduelbiliry, and 'epikinp• samples with known adtlltiont of the species being analysed, to account for the effects the matrix might have on the snalytit. 3.6.2 Lvslmetar L3 aamplei With respect to the lyaimster L3 samples the following comments on 0A procedufee can be made: ' sample 12/18192: na Intamal t~A wee run on this sample due to the limited senple volume. Therefore, the affects of matrix interference were not sceesaed; ' sample 02/21/92: sample L3W221, the sample from the L3 lyslmeter, was received past the hofdinp time for cyanide analysis. While QA replication end epikinp protocol wire used with this sample batch, the NDOratory chose Inndomly, ec required), the delonlsed caster blank for OA evaluation and hence did not evaluate the matrix effects on the 20 ml sire esmpls taken from L3; • eamDle 04/03/92: with only 5 mis of sample, then wee Insufficient temple to pOrlorm t].e. procedures on thla particular sample. In addition, the net effect of putting 2 prsma of eodlum hydroxide Intc the 5 mis of esmpls would have resulted In 'dilution' of the sample volume, which would result in detettion limit In the actual sample being higher than Instrumental detection limits In the laboratory.