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The Leadville Mill Environmental Sampling Procedures <br />Water Sample Collection <br />Page 2 -9 <br />QUALITY CONTROL <br />• Errors may be introduced during sampling and storage by failure to remove <br />residues of previous samples from the sample container; therefore, all <br />containers and sampling equipment should be thoroughly cleaned before use. <br />2.4.6 METALS <br />APPARATUS & MATERIALS <br />• Polyethylene or glass bottles. <br />• Dilute nitric acid (1 to 1): Mix equal volumes of concentrated nitric acid, <br />HNO3, with distilled /deionized (DS /DI) water. <br />• DS /DI water. <br />SAMPLE COLLECTION, PRESERVATION & HANDLING: <br />• Wash and rinse sample container thoroughly with dilute nitric acid (1 to 1), <br />then with DS /DI water before use. <br />• Acidify sample with dilute nitric acid (1 to 1) to a pH of 2 or less. Normally, <br />3mL of dilute nitric acid per liter should be sufficient to preserve each sample. <br />This will keep the metals in solution and minimize their adsorption on the <br />container wall. Preservatives should be added sparingly to meet the <br />requirements for the analytical method. The sample pH should be re- checked <br />after a short time to ensure that the acid has not been buffered out of the <br />sample. <br />• Samples should be analyzed within 6 months of collection. An exception is <br />mercury analysis, which must be completed within 28 days. <br />• Samples filtered for dissolved metals analysis should be preserved after <br />filtration rather than prior to filtration. <br />QUALITY CONTROL <br />• Serious errors may be introduced during sampling and storage by failure to <br />remove residues of previous samples from the sample container; therefore, <br />follow the described rinsing procedure for all containers and sampling <br />equipment. <br />April 2013 <br />