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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This indicator is available commercially in prepared form. Dilute to mL with water. Hold the tip of the pipette near the bottom of the beaker while discharging the sample. Mechanical stirring, preferably of the magnetic type, is required for this operation; mixing by means of a gas stream is not permitted.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Link to Active This link will always route to the current Active version of the standard. NOTE 2—If the sample requires appreciably more than 25 mL of standard solution for its titration, use a 0.
Unless otherwise indicated, it is intended that all reagents shall conform to the speci? In addition, reagent water for this test shall be free of carbon dioxide CO2 and shall have a pH between 6. For the convenience of the user, Committee D has highlighted those changes that may impact the use of these test methods. No other units of measurement are included in this standard.
ASTM D – 16 – Standard Test Methods for Acidity or Alkalinity of Water
d0167 All pH measurements are made electrometrically. When titrating to a selected end point dictated by practical considerations, 1 only a part of the actual neutralizing capacity of the water may be measured, or 2 this capacity may actually be exceeded in arriving at optimum acidity or alkalinity conditions.
The time required will vary with different waters as the reaction rate constants of different chemical equilibria vary. Place the electrodes in the d10677 and standardize the pH meter, using a reference buffer having a pH approximating that expected for the sample see Test Methods D Link to Active This link will always route to the current Active version of the standard.
It is used to develop an electrometric titration curve sometimes referred to as a pH curvewhich defines the acidity or alkalinity of the sample and indicates inflection points and buffering capacity, if any. If the sample is x1067, titrate to the phenolphthalein color change while hot.
Other reagent water types may be used provided it is? 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. Refer to Appendix X4 for historical information. Three test methods are given as follows: It is mandatory that analyses by Test Method A be carried out the same day the samples are taken; essentially immediate analysis is desirable for those waste waters containing hydrolyzable salts that contain cations in several oxidation states.
ASTM D1067 – 16
In addition, the acidity or alkalinity can be determined with respect to any pH of particular interest. Determine the pH when the mixture has reached equilibrium as indicated by a constant 2 6 Reagent Chemicals, American Chemical Society Speci? Last previous edition D — Summary of Test Method 8. In water analysis, a pH of about 4. This study should be repeated until the zstm are within the limits given in 15,24, or Second, at a pH of 8.
NOTE 6—After some practice, slightly more or less indicator may be preferred.
ASTM D – 88 Standard Test Methods for Acidity or Alkalinity of Water
No other units of measurement are included in this standard. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Historical Version s – view previous versions of standard. Summary of Test Method NOTE 5—The choice of end point will have been made to provide optimum data for the intended use or disposition of the water.
Prepare and standardize d1076 like manner.