1、 FORD LABORATORY TEST METHOD AK 107-01 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 3 Copyright 2001, Ford Global Technologies, Inc. QUANTITATIVE ANAL
2、YSIS OF CAUSTIC SODA OR CAUSTIC POTASH IN CLEANERS Application This test method is used to determine the percentage of sodium hydroxide (NaOH) or potassium hydroxide (KOH) in cleaners. The procedure is intended to be a simplified version of the applicable ASTM standard (e.g., D 501 or D 800) as well
3、 as being more appropriate for dealing with the many formulations of cleaners that are commonly encountered in plant operations. Apparatus Required Titration Apparatus Steam Bath Erlenmeyer Flasks 300 mL; 500 mL Hot Plate Funnel Suitable for use with filter paper Glass Rod The above apparatus is ava
4、ilable from any reputable laboratory equipment supply house. Material Required Methyl Alcohol Reagent grade; CAUTION: Low flash point. Hydrochloric Acid Concentrated; Reagent grade; CAUTION: Corrosive Filter Paper Whatman No. 541 FORD LABORATORY TEST METHOD AK 107-01 Page 2 of 3 Copyright 2001, Ford
5、 Global Technologies, Inc. Solutions Required Hydrochloric Acid - 0.5 N Phenolphthalein Indicator Dissolve 0.2 g of phenolphthalein in 50 mL of ethyl alcohol and add 50 mL of distilled water. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a con
6、trolled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Take a 2 to 3 g sample of the material in a 300 mL Erlenmeyer flask. 2. Add 40 to 50 mL of methyl alcohol. 3. Heat t
7、o boiling. 4. Remove from hot plate. 5. Stir, using a glass rod. 6. Decant through a Whatman No. 541 filter paper into a 500 mL Erlenmeyer flask. 7. Repeat steps 2 through 6 for a total of 5 extractions. 8. Wash the insolubles from the extraction flask onto the filter paper with hot alcohol (approxi
8、mately 45 - 60 C). 9. Wash the contents on the filter paper for a minimum of 5 times using hot alcohol. Collect all washings in the receiving flask. 10. The final washing shall be neutral to phenolphthalein. 11. Add phenolphthalein indicator to the recovered extract. 12. Titrate with 0.5 N hydrochlo
9、ric acid to the colorless end point. FORD LABORATORY TEST METHOD AK 107-01 Page 3 of 3 Copyright 2001, Ford Global Technologies, Inc. 13. Calculate the % of sodium or potassium hydroxide. % NaOH = mL of 0.5 N HCl x 0.0200 x 100 (If sodium hydroxide is present) weight of sample % KOH = mL of 0.5 N HC
10、l x 0.0280 x 100 (If potassium hydroxide is present) weight of sample Note: 1. Nitrites, if present, may interfere with the titration. 2. Determination must be made rapidly to avoid carbon dioxide pickup from the atmosphere. 3. If the sample is a liquid, a partial drying must be made in order to eli
11、minate the moisture. Use a steam bath for this evaporation. Drying is usually stopped when the liquid has been 95 to 98 % evaporated. Do not evaporate to complete dryness and do not prolong the drying time, since caustic will usually be partially converted to carbonates. 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.
