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r <br /> CT gY3VIRONMENTAL IAWRKTORY (GTEL) <br /> gTANDARD OPMXTING PROCEDURE <br /> CDNC'ER.NING FIELD PRESERVATION OF RTX SAMPLES <br /> ffiY ACIDiriCA.TION <br /> BOP 12 <br /> ~. <br /> If apeecially prepared acidified vials are not eavailable, aPPly <br /> the folloVing Field Procedures, rasing the field acidification <br /> kit. The kit a*ntains: <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 pE paper, 1.0-2.5 PH range. <br /> d) glass stirring rod. <br /> 1. collect approximately 3CrOcc of and@tine ofaaaxposur�koothe <br /> minimize turbulence, bubbling, <br /> air. <br /> 2. For inorganic analysis: use 50% nitric acid <br /> For volatiles Of4504cacidltois: use Measuri.nggcup. Holdic acid <br /> dropper <br /> Add 30 drop <br /> completely vertically. <br /> 3. Gently mix with glass bar. <br /> e. Remove bar and touch wetted tip to the pll 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 /> xt <br /> 5. Add more acid if necessary. Too much acid is not a problem, <br /> 1pful <br /> just record how much was added (this <br /> right —lusteadd <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 <br /> edsfto be cr the arest.dded atHoweverone 31testathe mPHneach <br /> will be sufficient <br /> -- <br /> time. <br /> for that well and cap <br /> d. Pour the water into the vials prepared <br /> off with no bubbles inside.n eeathatuituisnimportant bthat <br /> g <br /> are to be minimized. Also <br /> alct <br /> l of the vials for a given well be poured and sealed one <br /> -- Fight after another. tiheevials withsure the �as<ome tolsparedatsthe <br /> of <br /> onough to fill all increasedn be <br /> end. The volume collected c <br /> proportionally increase the amountafacidaddedbut remeer to <br /> 7. Acidification does not replace chilling. Always chill <br /> samples and ship via air for next day delivery. <br /> l�H��4�I�PITI N <br /> �Y i I Iv.UI i h:5 apt <br />