This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D19 on. Buy ASTM D Standard Test Methods for Acidity or Alkalinity of Water from SAI Global. ASTM: D Acidity or Alkalinity of water by electrometric titration Annual Book of ASTM Standards, Section 11, Water and Environmental Technology.
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The time required will vary with different waters as the reaction rate constants of different chemical equilibria vary.
Hydrogen peroxide H2O2 is added, the solution boiled, and? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. The acidity or alkalinity of the water or that relative to a particular pH is determined from the curve.
While inflection awtm rapid changes in pH are usually preferred for accurate analysis of sample composition and obtaining the best precision, the use of an inflection point for process control may result in significant errors in chemical treatment or process control in some applications.
ASTM D – 88 Standard Test Methods for Acidity or Alkalinity of Water
All the effects due to these anions are lumped together in an alkalinity analysis. The analyst must use the same quantity of phenolphthalein at all times, however, because at a given pH, the intensity of one-color indicators depends on the quantity.
Suspended solids may cause sluggishness in electrometric titrations; however, compensation is made by a s pause between alkali additions or by dropwise addition of titrant when the designated pH is approached. This study should be repeated until the recoveries are within the limits given in 15,24, or It is particularly applicable to mine drainage, industrial waste waters carrying waste acids, and similar waters.
Similarly, the development of a precipitate during titration may make the glass electrode sluggish and cause high results. Under such conditions, all ferrous iron is rapidly oxidized to the ferric state, resulting in the precipitation of Fe OH 3: Determine the pH when the mixture has reached equilibrium as indicated by a constant 2 6 Reagent Chemicals, American Chemical Society Speci? No other units of measurement are included in this standard.
Unless otherwise indicated, it is intended that all reagents shall conform to the speci? It is important, therefore, that the v1067 be sufficient to allow for any signi? Hold the tip of the pipette near the bottom of the container while discharging the sample. D — 06 X4. The other two methods are used to determine acidity or alkalinity relative to a predesignated end point based on the change in color of an internal indicator or the equivalent end point measured by a pH meter.
ASTM D1067 – 16
The LCS must be taken through all of the steps of the analytical method, including sample d10677. Interpretation of acidity and alkalinity data should be made cautiously. When using an indicator, add 0. Other reagent water types may be used provided it is? Three test methods are given as follows:.
NOTE 5—The choice of end point will have been made to provide optimum data for the intended use or disposition of the water. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. If the sample is colorless, titrate to the phenolphthalein color change while hot. Hold the tip of the pipette near the bottom of the beaker while discharging the sample. Volatile components contributing to the acidity or alkalinity of the water may be lost during sample pretreatment.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Active view current version of standard Translated Standard: Precision and Bias 7 Type III water was speci? In some instances the reaction time may be an interval of a few seconds while other slower, more complex reactions may require much longer intervals. Test Method A Electrometric Titration. A discussion of terms is presented in Appendix X1. Second, at a pH of 8.
In many instances, the concentration of ferrous iron is such that a 2-min boiling period is not sufficient to assure complete oxidation. Dilute to mL with water. D — 068 and dissolve. They are suitable for routine control purposes. Three test methods are given as follows:. Refer to Appendix X4 for historical information. In this test method, hydrogen peroxide is added prior to boiling to accelerate the chemical reactions needed for equilibrium. Summary of Test Method First, the solubility of ferrous ion at a pH of 8.
Three test methods are given as follows: The concentration of the IRM should be in the concentration mid-range for the method chose. The replicates may be interspersed with samples. Hydrolyzable salts of aluminum and ferric and ferrous iron in mine drainage and certain industrial waste waters, are common causes of acidity.
Three test methods are given as follows: Summary of Test Method 8. Add the standard solution in small increments, swirling the?