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�fETH00�9045r ' <br /> OIL DH <br /> r <br /> ` 1.0 SCOPE AND APPLICATION <br /> 1.1 Method 9045 is an electrometric_.,,procedure which has been approved <br /> for measuring pH in calcareous and noncalcareous oils , <br /> .. .. :._ <br /> 2.0 SUMMARY OF METHOD <br /> 2.1 The soil sample is mixed either with Type II water or with a calcium <br /> chloride solution (see Section 5.0) , depending on whether the soil <br /> considered calcareous or noncalcareous. The is <br /> measured with a pH meter, pH of the solution is then <br /> 3.0 INTERFERENCES <br /> 3.1 Samples with very low or very high pH may give incorrect readings <br /> the meter. For samples with a true g on <br /> incorrectly low. This error can be minimized by using aelowrso low-sed pH obe <br /> dium-error <br /> electrode. Strong acid solutions, with a true pH of <1, may give incorrectly <br /> high pH measurements, ctly <br /> 3.2 Temperature fluctuations will cause measurement errors. <br /> 3.3 Errors will occur when the electrodes become coated. If an <br /> electrode becomes coated with an oily material that will not rinse free the <br /> electrode can either (1) be cleaned with an ultrasonic bath, or (2) be washed <br /> with detergent, rinsed several times with water, <br /> the lower third of the electrode is submerged, and thenthoroughlyred in 1:10 insed that <br /> water, y d with <br /> 4.0 APPARATUS AND MATERIALS <br /> 4.1 pt_Meter with means for temperature compensation. <br /> 4.2 Electrodes: <br /> 4.2.1 Calomel electrode. <br /> 2 z GA ass.*I*rrroup^ <br /> x'•2,.3 A Combination electrode can be employed instKcd of Gal <br /> - y1r:S. Cmel or <br /> 4.5 Beaker: 50-mL. <br /> 9045 — 1 <br /> Revision 0 <br /> Date September 1986 <br />