1、 FORD LABORATORY TEST METHOD AK 106-01 Date Action Revisions 2001 01 22 Revised Editorial no technical change A. Cockman 2000 03 23 Revised Editorial no technical change A. Cockman 1992 06 03 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. QUANTITATIVE ANAL
2、YSIS OF THE TOTAL ALKALINITY OF CLEANERS Application This test method is used to determine the total alkalinity of cleaners. The procedure is intended to be a simplified version of the applicable ASTM standard (e.g., D 501 or D 800) as well as being more appropriate for dealing with the many formula
3、tions of cleaners that are commonly encountered in plant operations. Apparatus Required Hotplate Titration Apparatus Erlenmeyer Flask 300 mL Beaker 100 mL The above apparatus is available from any reputable laboratory equipment supply house. Material Required Hydrochloric Acid Concentrated, reagent
4、grade. Solutions Required Hydrochloric Acid Solution - 0.5 N Methyl Purple Indicator An aqueous solution containing approximately 0.1 % active constituent. Source: Harry Fleisher Chemical Co. Benjamin Franklin Station Washington, D.C. 20044 or equivalent. FORD LABORATORY TEST METHOD AK 106-01 Page 2
5、 of 2 Copyright 2001, Ford Global Technologies, Inc. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditi
6、ons unless otherwise specified. Procedure 1. Take a 0.5 to 1.0 g aliquot of the prepared 1 % solution of cleaner into a 300 mL Erlenmeyer flask. 2. Add methyl purple indicator. 3. Titrate with 0.5 N hydrochloric acid solution to the end point (a change from green to purple). 4. Heat this solution to
7、 boiling. 5. Boil for 10 minutes. This step is required in order to remove carbon dioxide which interferes with true end point. 6. If the indicator reverts back to the green color, the solution must be titrated again with more 0.5 N hydrochloric acid. 7. Calculate the alkalinity (usually) as Na2O %
8、Na2O = Total mL 0.5 N HCL Used x 0.0155 x 100 Weight of Sample Note: Nitrites, if present, may interfere with the determination of total alkalinity. If this should happen, apparent alkalinity should be reported using the end point that was obtained in Step #3. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.
