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<br />Division of Wildlife Issues and Responses <br />for June 5, 1997 Letter <br />(continued) <br />Table ]: Comparison of Analytical Detection Limits and Water Quality Standards for Selected Chemical Parameters <br /> Current CDOW <br /> Minimum Current Requested <br /> Detection Practical Minimum Achievable <br /> Limit Quantitation Detection Minimum Freshwater Organism, <br /> Current (MDL) Limit (PQL) Limit (MDL) Detection Chronic Lowest Observed <br />Parameter Methodology (ppb) (ppb) (ppb) Limit (ppb) Methodology Effect Level (LOEL)' (ppb) <br />Cadmium Graphite 0.5 3 0.1 0.2 ICPMS 1100 <br /> Furnace <br />Copper ICP 10 50 I 1 ICPMS ]2000 <br />Selenium AA, gaseous 1 5 2 2 ICPMS 35000 <br /> hydride <br />Silver ICP 5 30 0.05 0.1 ICPMS 120 <br />Zinc ICP 10 50 10 2 ICPMS 47000 <br />Nitrite Automated 10 50 3 10 lon <br /> Cadmium Chromatography <br /> Reduction <br />' USEPA, 1986. Quality Criteria for Water, 1986. NT1S PB87-226759, Springfield, VA. <br />C~ <br /> <br />7 <br />