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��R � Y7 "t S�y �` yet pti e,•�v'� w�'� �d .� a•Y r � � <br />� :�'+, at�4 •r � .r a. ���5' 1�'F' ri �'1 +nr�f x.' '#. ✓�� f �� �L{- M1`r�ti 7. �1 • � �° �i ,yxW t:�. �* . <br /> i - I ;l ry'� .�l�a [�i a tr, _ ,r' ti•.� � �y{r;'�. -� F pi��i,�.,1'r C;�7�ir 6 �° s '.i �r �� 1r�..'. x_ �� • <br /> to be urc•d, aid twice the volume of. surrcagatc s anti <br /> 4 m,ctYiX Piki:IS eo¢npouRids since• hnlf the extract <br /> clue to loading to the GPC column. <br /> 7.5.4 lmmcdiat,�!ly add whatever volume of solvent is necessary <br /> to bring the finai volu:ne to 10.0 ml. considering CIIc <br /> added volume of surrogates and matrix spikes. Disrupt <br /> the sample wit1: the 1/8-in, tapered microtip ultrasonic <br /> probe for 2 min at -.1tput control setting 5 and with <br /> mode switch on pulse and percent duty cycle. of 502. <br /> Extraction solvents are: <br /> 1. Nonpolar compounds, i.e. , organocillorine pesticides <br /> and PCBs: hexane. <br /> 2. Extractable priority pollutants: merhylelle <br /> chloride. <br /> 7,5.5 Loosely pack disposable Pasteur pipets with 2- to 3-cm <br /> Pyrex glass-wool plugs. Filter the extract through the <br /> glass wool and collect 5.0 mL in a concentrator tube if <br /> further concentration is required. Follow Paragraphs <br /> 7,4,6 through 7.4.12 for details on concentratio: . <br /> Normally, the 5.0 mL extract is concentrated to 1.0 ml. <br /> 7.5.6 The extract is ready for cleanup or analysis, depondinr <br /> on the extent of interfering cD-extractives. <br /> 8.0 QUALITY CONTROL <br /> 8.1 Any reagent blanks or matrix spike samples should be subject to <br /> exactly the same analytical procedures as those used on actual <br /> samples. <br /> 8.2 Refer to Chapter One for specific quality control procedures and <br /> Method 3500 for extraction and sEmple preparation procedures. <br /> 9.0 METHOD PERFORMANCE <br /> 9.1 Refer to the determinarive methods for performance data. <br /> 10.0 REFERENCES <br /> 1. U.S. EPA 40 CFR Part 136, "Guidelines Establishing Test <br /> Procedures for the Analysis of Pollutants Under the Clean Water <br /> Act-, Final Rule and Interim Final Rule and Proposed Rule," <br /> October 26, 1984. <br /> 2. U.S. EPA, Int_erlaboratory Comparison Study: Methods for <br /> Volatile and Semi-Volatile Compounds, Environmental Monitoring <br /> ing <br /> Systems Laboratory, Office of Research and Development, <br /> Vegas, ,`V, EPA 600/4-84-027, 1984. <br />