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(A.ARaiM1Wbse:+aiC'.. file-'•F"L-..ZCRr8Y4�.�i'CYBOAGYVi'•RC..m • _ ._ „w'i-. :- r"_ _. •'- .. "^`95 0 �• ••- .• ., <br /> V <br /> COMMERCIAL TESTING & ENGINEERING CO. <br /> GENERAL OFFICES: 226 NORTH LA SALLE STREET, CHICAGO. ILLINOIS 60601 AREA CODE 312 726-6434 <br /> ZtL _ <br /> a«e�nos <br /> Reply to <br /> Instrumental Analysis Division Phone: 303-278-9521 <br /> 490 Orchard Street December 3, 1980 <br /> Golden,CO 80401 <br /> Mr. Jack Gillespie Lc <br /> CF & I Steel Corporation <br /> P.O. Box 316 <br /> Pueblo, Colorado 81002 1960 <br /> RE: IAD #97-F207-032-03 tA1NING r)�p <br /> P.O. 026144 ARrMENr <br /> Release #R26679 <br /> ANALYTICAL REPORT <br /> Three water samples were received for analyses on October 2, 1980. These <br /> samples were given our identification IAD #97-F207-032-03. <br /> All of the samples were analyzed for both dissolved (non-preserved in the <br /> field, then laboratory filtered with a 0.45 pm filter and then nitric acid <br /> preserved) and total (non-filtered and nitric acid preserved in the field) <br /> metals. Some discrepancies may be noted when comparing dissolved and total <br /> metals data. It should be kept in mind that as values approach the detection <br /> limit for any determination, the results may become inconclusive. This <br /> fact is based on instrumental conditions alone regardless of other analy- <br /> tical or sampling problems; i .e. , contamination at the time of sampling, <br /> or contamination or loss during digestion, etc. The detection limit is <br /> defined as twice the standard deviation of the noise level . Results may <br /> be reported with 66% confidence, by definition, at one standard deviation <br /> of the detection limit. In practical application, results approaching the <br /> detection limit are only good (at 95% confidence level ) to plus or minus <br /> two (2) times the detection limit. Samples with deviations that are found <br /> to exceed this (between totals and dissolved metals) are reprepared and <br /> reanalyzed in an attempt to eliminate analytical errors. If data still <br /> differs by more than twice the detection limit, problems other than analy- <br /> tical exist. Attention should then be directed to sampling and/or preser- <br /> vation procedures or other involved aspects . The same problems will arise <br /> if the detection limit is lowered by the use of alternative analytical <br /> methods. The same amount of material will exist in the sample, but the <br /> amount of deviation from that value is lowered. <br /> All samples for dissolved metals to be analyzed by atomic absorption were <br /> first given a light acid digestion (to be sure 0.45 pm filtered metals <br /> are in solution) . All samples to be analyzed for total metals by atomic <br /> absorption were subjected to a rigorous digestion in hydrochloric and <br /> nitric acids and, if there was sediment undissolved, filtered before AA <br /> analysis. <br /> J � <br /> b! �4 <br />