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v �7 'x z; cwe. ��.�. ; a p �, sv � ,?, •yy ��. ✓. �� r�� t <br /> a <br /> GT ENVIRONMENTAL: LABOR&TORY (GTEL) <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING FIELD PRESERVATION OF BTX SAMPLES <br /> ]BY p,CIDIFICATION <br /> SOP 12 <br /> If specially prepared acidified vials are not svailab' apply <br /> the following Field Procedures, using the field acidi. ration <br /> kit. The kit contains: <br /> a) 500 cc glass measuring cup or breaker. <br /> b) dropping bottle of 50% hydrocloric acid or nitric <br /> acid. <br /> _._ c) narrow range pH paper, =.0-2.5 pH range. <br /> d) glass stirring rod. <br /> 1. Collect approximately 300cc of water in beaker. Try to <br /> minimize turbulence, bubbling, and time of exposure to the <br /> air. <br /> 2. For inorganic analysis: use 50% nitric acid <br /> For volatile organic analysis: use 50$ hydroHold c acid <br /> dropper <br /> Add 30 drops of 50% acid to measuring cup• <br /> Completely vertically. <br /> 3. Gently mix with glass bar. <br /> 4. Remove bar and touch wetted tip to the pH paper and check <br /> color code to assure it is below pH 2. As more acid is <br /> added the pH goes lower. Discard used pH strip. <br /> 5, Add more acid if necessary. Too much acid is not a problen, <br /> just record how much was added (this will be helpful next <br /> add <br /> time) . Don't waste time trying Ideally, once you know <br /> plenty of acid to get it below pH 2• <br /> how much acid needs be added atHoone <br /> ev well, <br /> est athe mpHneach <br /> will be sufficient for <br /> time. <br /> 6. pour <br /> wthe water intobles tnsidealsAga�naturbulencered for aandebubblingap <br /> ao f f ino <br /> are to be minimized. Alia note that pourediandrsealedthat <br /> one <br /> all of the vials for a given well be P <br /> right after another. Makesurere thewit3some tolsparedatsthe <br /> 00cc cc <br /> enough to fill all of thevials but <br /> end. The volume c=oasetthecamabntincreased <br /> raciddadded�emember to <br /> proportionally <br /> M ;+ Acidification does not replace chilling. Always chill <br /> samples and ship via air for next day delivery. <br />