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� �_� .-.,,,.. _.. �_..rte---- •� _. ...�__ -- _ <br />���� �,xt-'�`r¢� S:g ��.v:�.Q�Y::.�w.'�s���. h-, QTY^ -� ��r�'�+u.���r�,�S:� .,rd�",.'.;•'' _ s?ce:;.* "7.,, r , <br /> i-a <br /> i <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 not available, apply <br /> the followinz4 Field Procedures, using the field acidification <br /> kit. The kir contains: <br /> a) Soo cc glass measuring cup or breaker. <br /> b) dropping bottle of 5o% hydrocloric acid or nitric <br /> acid. <br /> C) narrow range pH paper, 1.0-2.5 pH range. <br /> - d) glass stirring rcd. <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 5o% nitric acid <br /> For volatile organic analysis: use 50$ hydrocloric acid <br /> uw Add 30 drops of 50% acid to measuring cup. Hold dropper <br /> i completely vertically. <br /> .6 <br /> ,.; 3. Gently mix with glass bar. <br /> l..r 4. Remove bar and touch wetted tip to the pH paper and check <br /> calor code to assure it is below pH 2. As more acid is <br /> added the pH goes lover. Discard used pH strip. <br /> 5. Add more acid if necessary. Too much acid is not a problem, <br /> just record how much was added (this will be helpful next <br /> time) . Don't waste time trying to gat it right - just add <br /> ' plenty of acid to get it below pH 2. Ideally, once you know <br /> how much acid needs to be added at one well, that amount <br /> will be sufficient for the rest. However, test tha pH each <br /> time. <br /> 6. Pour the .rater into the vials prepared for that well and cap <br /> off with no bubbles inside. Again turbulence and bubbling <br /> t are to be minimized. Also note that it is important that <br /> E all of the vials for a given well be poured and sealed one <br /> right after another. Make sure the 30occ collected is <br /> enough to fill all of the vials with some to spare at the <br /> end. The volume collected can be increased but remember to <br /> proportionally increase the amount of acid added. <br /> 7. Acidification doers not replace chilling. Always chill <br /> r <br /> samples and ship via air for next day delivery. <br /> �— GROUNDWATER <br /> �r;� TEiHSOWGY.1.c, <br />