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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ASTM D 水的酸性和碱性的测试方法_百度文库
The value obtained must fall within the control limits established by the laboratory. Hydrogen peroxide H2O2 is added, the solution boiled, and? Standard acid is added as needed to lower the pH to 4.
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.
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. All pH measurements are made electrometrically. It is particularly applicable to mine drainage, industrial waste waters carrying waste acids, and similar waters.
Subsequent hydrolysis of the resultant ferric ion immediately During the subsequent titration, the ferric ion is precipitated as ferric hydroxide: 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.
This section may also include descriptions of the changes or reasons for the changes, or both. 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 matrix and chemistry of the solution should be equivalent to the solution 5 Three test methods are given as follows:.
Under such conditions, all ferrous iron is rapidly oxidized to the ferric state, resulting in the precipitation of Fe OH 3: Active view current version of standard. The replicates may be interspersed with samples.
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. Dilute to mL with water. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but d10667 not provided as part of the standard.
It is the responsibility of the analyst to determine the acceptability of these test methods for each matrix. The acidity or alkalinity of the water or that relative to a atm pH is determined from the curve. The time required will vary with different waters as the reaction rate constants of different d167 equilibria vary.
For the convenience of the user, Committee D has highlighted those changes that may impact the use of these test methods.
ASTM D1067 – 16
Suspended solids may interfere in electrometric titrations by making the glass electrode sluggish. Type III water was speci?
NOTE 3—An electrometric titration curve is smooth, with the pH changing progressively in a single direction, if equilibrium aastm achieved after each incremental addition of titrant, and may contain one or more in? No other units of measurement are included in this standard. First, the solubility of ferrous ion at a pH of 8.
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.
Originally published as D — A superscript epsilon e indicates an editorial change since the last revision or reapproval. Volatile components contributing to the acidity or alkalinity of the water may be lost during sample pretreatment.
Only the particular adaptation of the electrometric titration appearing as the Referee Method is believed to be largely the work of Committee D 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.
In addition, the acidity or alkalinity can be determined with respect to any pH of particular interest. This study should be repeated until the recoveries are within the limits given in 15,24, or asmt Hold the tip of the d067 near the bottom of the container while discharging the sample. 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.