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 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. In addition, the acidity or alkalinity can be determined with respect to any pH of particular interest.
Under the allowances made in 1. Volatile components contributing to the acidity or alkalinity of the water may be lost during sample pretreatment. 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.
If a concentration other than the recommended concentration is used, refer to Test Method D for information on applying the F test and t test in evaluating the acceptability of the mean and standard deviation. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Add the standard solution in small increments, swirling the?
Three test methods are given as follows:. Place the electrodes in the beaker and standardize the pH meter, using a reference buffer having a pH approximating that expected for the sample see Test Methods D 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 LCS must be taken through all of the steps of the analytical method, including sample pretreatment. If large numbers of samples are analyzed in the bath, analyze the LCS after every 10 samples. Other reagent water types may be used provided it is?
The acidity or alkalinity of the water or that relative to a particular pH is determined from the curve. It is used for the development of a titration curve that will de? Prepare and standardize in like manner. 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.
ASTM D – 16 Standard Test Methods for Acidity or Alkalinity of Water
While inflection points 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. When titrating to a selected end point dictated by practical considerations, 1 only a part of the d0167 neutralizing capacity of the water may be measured, or 2 this capacity may actually be exceeded in aastm at optimum acidity or alkalinity conditions.
Hydrogen peroxide H2O2 is added, the solution boiled, and? D — 06 X4. It is the responsibility of the analyst to determine the acceptability of these test methods for each matrix.
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. Three test methods are given as follows: Historical Version s – view previous versions of standard.
Three test methods are given as follows: Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Type III water was speci? The replicates may be interspersed with samples. Three test methods are given as follows:.
Color change and endpoint data for indicators listed herein are presented in Appendix X2 and Table X2. Standard acid d1076 added as needed to lower the pH to 4. Current edition approved Jan.
ASTM D1067 – 16
Test Method A Electrometric Titration. The cumulative volume of solution added is plotted against the observed pH values. In many instances, the concentration of ferrous iron is such that a 2-min boiling period is not sufficient to assure complete oxidation.
Unless otherwise indicated, it is intended that all reagents awtm conform to the speci? 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 bases and strong acids.