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'ERP"I'li <br /> 1". <br /> 7 <br /> GT ENVIRONMENTAL LABORATORY (GTEL) <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING FIELD PRESERVATION OF BTX SAMPLES <br /> BY ACIDIFICATION <br /> SOP 12 <br /> If specially prepared acidified vials are <br /> the following Field Procedures not available, apply <br /> kit. The kit contains: using the field acidification <br /> a) dropping 500 cc glass measuring cup or breaker. <br /> b) acid. bottle of 50% hydrocloric acid or nitric <br /> C) narrow range <br /> d) PH paper, <br /> glass stirring roa. 1.0-2,5 pH range. <br /> 1• Collect approximately 30Dcc of water in bea3 ' -'. <br /> minimize turbulence <br /> air. , bubbling, and time Of exposure to o <br /> tothe <br /> 2. For inorganic analysis: <br /> Far volatile use 50% nitric acid <br /> Add 30 drops organic analysis; use 50$ hydrocloric <br /> completelypverticallyld to measuring cup. Hold dropper <br /> 3• Gently mix with glass bar. <br /> .__. 4• Remove bar and touch <br /> color carie to wetted tip to the PH paper and check <br /> - added the assure it is below pH 2. As more <br /> PH goes .lower. Discard used a-id is <br /> 5• Add more acid if necessaryPH strip. <br /> Just record how much was a- Too much acid is not a <br /> time) . Don't waste time dded (this will be helpful next <br /> plenty of acid to trying to get it right - just add <br /> how much acid needsetoit below PH 2. Ideally, once <br /> will be sufficient for the rest. one well, that amount <br /> Yuntou know <br /> � <br /> time. However, test the <br /> PH each <br /> - 6• Pour the water into the vials <br /> Off with no bubbles inside. prepared for that well and cap <br /> are to be minimized. Also Again turbulence and bubbling <br /> all of the vials for a note that it is important that <br /> right after another. given well be poured and sealed one <br /> enough to fill all of the vials withake sure the 3some toll ctedaisthe <br /> end. The volume collected can be increased but remember to <br /> proportionally increase the amount of acid added. <br /> 7• Acidification does not replace chillin <br /> samples and ship via air for next day deliveryY$ chill <br />