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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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 qstm. Hydrogen peroxide H2O2 is added, the solution boiled, and? For the convenience of the user, Committee D has highlighted those changes that may impact the use of these test methods.
ASTM D 水的酸性和碱性的测试方法_百度文库
Refer to Appendix X4 for historical information. 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 Three test methods are given as follows:.
No other units of measurement are included in this standard. The acidity or alkalinity of the water or that relative to a particular pH is determined from the curve. First, the solubility of ferrous ion at a pH of 8. It is used to develop an electrometric titration curve sometimes referred to as a pH curvewhich de?
Three test methods are given as follows: D — 06 Historical Version s – view previous versions of standard Translated Version s: 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. Originally published as D — Hold the tip of the pipette near the bottom of the container while discharging the sample. Waste materials present in some waters may interfere chemically with color titrations by destroying the indicator.
If large numbers of samples are analyzed in the bath, analyze the LCS after every 10 samples. It is used for the development of a titration curve that will define inflection points and indicate buffering capacity, if any. 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.
It is important, therefore, that the period be sufficient to allow for any signi? This study should be repeated until the recoveries are within the limits given in 15,24, or D — 06 X4. The concentration of the IRM should be in the concentration mid-range for the method chose. 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. All pH measurements are made electrometrically. 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.
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. After each addition, mix the solution thoroughly. They are suitable for routine control purposes.
The acidity or alkalinity of the water or that relative to a particular pH is determined from the curve. 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. The matrix and chemistry of the solution should be equivalent to the solution 5 Continue the titration until the necessary data for the titration curve have been obtained.
This section may also include descriptions of the changes or reasons for the changes, or both.
Add the standard solution in small increments, swirling the? 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?
In some instances the reaction time may be an interval of a few seconds while v1067 slower, more complex reactions may require much longer intervals.
ASTM D1067 – 16
A number in parentheses indicates the year of last reapproval. Second, at a pH of 8. 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.
Dilute to mL with water. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The acidity or alkalinity relative to a particular pH may be determined from the curve.
Refer to Appendix X4 for historical information. Each replicate must be taken through the complete analytical test method including any sample pretreatment steps. Under the allowances made in 1. It is the responsibility of the user of this standard d167 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
While inflection points rapid d10667 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. No other units of measurement are included in this standard.