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.I <br />_ L~~~ COMMERCIAL TESTING & ENGIN EE RING CO. <br />.~ l~lETHD~S cont. <br />Aeration/pH Unadjustment Test (pHi) - Twenty C dubia were exposed to a dilution water <br />blank and SO%, 75%, and 100% effluent, without pH adjustment, and vigorously aerated for one <br />;~ hour. Dilutions were prepared with reconstituted laboratory water at 120 mg(L CaC03. <br />Post Ga SPE Column Test (pHi) -Twenty C. daabra were exposed to a dilution water blank and <br />50%, 75%, and 100% effluent filtered through a post Cas SPE column. Dilutions were prepared <br />,, with reconstituted laboratory water at 120 mg/L CaC03. <br />+ EDTA Chelation Addition Test (pHi) -Twenty C. dubia were exposed to a dilution water <br />,~ blank and 50%, 75%, and 100% effluent spiked with EDTA salt stock solution (2500 mg/L) to <br />achieve a final concentration of 3.0 mg/L. Dilutions were prepared with reconstituted laboratory <br />i water at 120 mg/L CaCOs. <br />Sodium Thiosulfate Addition Test (pHi) -Twenty C. dubia were exposed to a dilution water <br />blank and 50%, 75%, and 100% effluent spiked with sodium thiosulfate stock solution (2500 <br />mg/L) to achieve a final concentration of 10.0 mg/L. Dilutions were prepared with reconstituted <br />laboratory water at 120 mg/L CaCOs. <br />AcidBase Ion Exchange Resin Test -Twenty C. dubia were exposed to a dilution water blank <br />and 50%, 75%, and 100% effluent that was filtered through an acid/base ion exchange resin <br />capsule using a vacuum pump. Dilutions were prepared with reconstituted laboratory water at <br />120 mg/L CaCOa. <br />Metals analysis was performed using Inductively Coupled Plasma (ICP) and Graphite Furnace <br />analysis by EPA method 600 4.1.4. <br />Chloride was determined by Standard Method (SM) 4500-C1-E. Sulfate was determined by SM <br />4500-SOa-C. SM 2320-B determined alkalinity. SM 2540-C determined TDS. <br /> <br />y <br />F~szs <br />