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.
|Published (Last):||18 July 2013|
|PDF File Size:||12.18 Mb|
|ePub File Size:||18.17 Mb|
|Price:||Free* [*Free Regsitration Required]|
Color change and endpoint data for indicators listed herein are presented in Appendix X2 and Table X2.
As the end point is approached, a momentary change in color will be noted in that portion of the sample with which the reagent? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the d1607 address or at phonefaxor service astm.
It is particularly applicable to mine drainage, industrial waste waters carrying waste acids, and similar waters. NOTE 3—An electrometric titration curve is smooth, with the pH changing progressively in a single direction, if equilibrium is achieved after each incremental addition of titrant, and may contain one or more in?
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Historical Version s – view previous versions of standard Translated Version s: Variable results may be experienced with waters containing oxidizing or reducing substances, depending on the equilibrium conditions and the manner in which the sample is handled.
Your comments are invited either for revision of this standard or for sstm standards and should be addressed to ASTM International Headquarters. Second, at a pH of 8. If large numbers of samples are analyzed in the bath, analyze the LCS after every 10 samples. Acidity determinations on waters containing ferrous iron are further complicated by air oxidation of ferrous to the ferric state and subsequent hydrolysis to produce additional acidity.
The acidity or alkalinity relative to a particular pH may be determined from the curve. They are suitable for routine control purposes.
Refer to Appendix Zstm for historical information. The value obtained must fall within the control limits established by the laboratory. In addition, the acidity or alkalinity can be determined with respect to any pH of particular interest.
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 d11067 actually be exceeded in arriving at optimum acidity or alkalinity conditions.
Under such conditions, all d0167 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? Similarly, the development of a precipitate during titration may make the glass electrode sluggish and cause high results.
No other units of measurement are included in this standard. Continue the titration until the necessary data for the titration curve have been obtained. Refer to Appendix X4 for historical information.
ASTM D1067 – 16
Summary of Test Method 8. D — 06 If the pH is above 4. Dilute to mL with water. Historical Version s – view previous versions of standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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. 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.
ASTM D – 16 – Standard Test Methods for Acidity or Alkalinity of Water
Of the three procedures, Test Method A is the most precise and accurate. Then, the analyst may be able to develop an interpretation of his data better suited to his particular needs. NOTE 9—Minus acidity represents excess alkalinity contributed by constituents such as bicarbonates. It is used to develop an electrometric titration curve sometimes referred to as a pH curvewhich de? Hydrogen peroxide H2O2 is added, the solution boiled, and?
Three test methods are given as follows: Active view current version of 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.
The replicates may be interspersed with samples.
When using an indicator, add 0. After each addition, mix the solution thoroughly. It is used for the development of a titration curve that will de?
It is used for the development of a titration curve that will define inflection points and indicate buffering capacity, if any.
ASTM D 水的酸性和碱性的测试方法_百度文库
This standard has been approved for use by agencies of the Department of Defense. NOTE 6—After some practice, slightly more or less indicator may be preferred. It is the responsibility of the analyst to determine the acceptability of these test methods for each matrix. When titrating to a selected end point dictated asmt 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.
Acidic materials encountered in water analysis include, in addition to free organic and mineral acids, uncombined dissolved gases, and acids formed on hydrolysis of salts of weak sstm and strong acids.
Subsequent hydrolysis of the resultant ferric ion immediately During the subsequent titration, the ferric ion is precipitated as ferric hydroxide: NOTE 8—Hydrochloric acid of similar normality may be used instead of sulfuric acid.