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°3 R----___- (optional) . _ <br /> 5.0 REAGENTS <br /> `+ 5.1 Certified pH buffers: To be used f <br /> for calibrating t e pH meter that will be used the pH paper or <br /> PH paper. subsequently to calibrate the <br /> 5.2 Dilute acid (e.g., 1:4 HCl) . <br /> 5.3 Dilute base <br /> (e-g., 0.1 N NaOH) <br /> 6.0 SAMPLE COLLECTION, PRESERVATION, AND HANDLING <br /> 6.1 All samples must be collected using a samplingPlan <br /> the considerations discussed in Chapter Nine of this manal ,which addresses <br /> 7.0 PROCEDURE <br /> 7.1 A representative aliquot of the waste must be <br /> PH paper to determine the approximate pH, tested with wide-range <br /> 7.2 The appropriate narrow-range pH paper is chosen <br /> second aliquot of the waste is determined. This meas and t p o a <br /> performed in duplicate. measurement should be <br /> 7.3 Identification of interference: <br /> 7.3.1 Take a third aliquot of the waste® approximately <br /> volume, and add acid dropwise until a pH change is 2 ml in <br /> color change. Note the <br /> 7.3.2 Add base dropwise to a fourth aliquot a <br /> change. (Wastes that have a buffering capacit may requiree the color <br /> acid or base to result in a measurable pH change. q additional <br /> 7.3.3 The observation of the appropriate color change is a <br /> indication that no interferences have occurred. g strong <br /> CAUTION: ADDITION OF ACID OR BASE TO SAMPLES MAY <br /> REACTIONS OR THE GENERATION OF TOXIC FUMES. PRECAUTIONS <br /> IN VIOLENT <br /> TAKEN. THE ANALYST SHOULD PERFORM THESE TESTS IN A WELL-VE MUST EBE <br /> D <br /> HOOD WHEN DEALING WITH UNKNOWN SAMPLES. WELL-VENTILATED <br /> taken with corrosive Method 9041 can be used to define <br /> a waste <br /> threshold limit (pH 2 cr '2,5) by a�ffut the <br /> measured values differ from either <br /> of either pH 1-3 or pH 11a are P unit. If readings in the ranges <br /> the solution must be determined5electrometricallth Method 9041, then the pH of <br /> Y (Method 9040) . <br /> 9041 — 2 <br /> Revision 0 <br /> Date Septem er 1986 �` <br />