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Food & Beverage
Detergent Residue Testing
Using a pH Meter, pH indicator, or test kit
The following test procedures are suitable for detecting detergent residues resulting from improper rinsing and can be used to meet laboratory accreditation guidelines and questionnaires such as the College of American Pathologist program of State water lab accreditation programs.
A. pH Meter Method
Note: If deionized water is used as the sample water, a slight amount of reagent grade, non-buffering salt (NaCl, CaCl2) should be added to the sample water to allow pH meter to function properly. If you want to avoid contaminating clean glassware, dump the glassware testing solution into a triple rinsed beaker and then add the non-buffering salt prior to measuring the pH with a meter.
Note regarding pH paper: detergents and surface active agents can interfere with some pH paper by causing a decrease of several pH units in reading. Please test any pH paper you intend to use with these detergents to determine if there is any interference before adapting this procedure for use with pH paper.
You should test approximately 1% of large frequently washed quantities of glassware and5% of smaller quantities of less frequently washed glassware, and you should rotate the types of glassware tested. Particularly try to test narrow necked volumetric flasks more frequently. Keep records of the test date, types of glassware tested and test results.
The above procedure A is effective for the following Alconox, Inc. detergent brands: ALCONOX, LIQUI-NOX, TERG-A-ZYME, ALCOJET, DET-O-JET and DETERGENT 8.
If you are testing for CITRANOX or CITRAJET detergent, please adapt the procedure to testfor an acid residue and therefore determine if there is a significant lowering of 0.2 pH units as in step 6 an acid shift would indicate an acid residue.
B. pH Indicator Method for Alkaline Detergents
The above procedure B is effective for the following Alconox, Inc. detergent brands: ALCONOX, LIQUI-NOX, TERG-A-ZYME, ALCOJET, DET-O-JET and DETERGENT 8.
C. Detergent Test Kit Method for Neutral pH Anionic Detergents
If you are testing for ALCOTABS detergent, please adapt the procedure to use a detergent test kit that is sensitive to anionic detergent residues. These kits are available from:
Use the kits to test for detergent in rinse water that has passed through a pipette. If no detergent is detected with the kit, you can conclude that there is no interfering residue from the ALCOTABS.
Thank you for your interest in Alconox, Inc. detergents.
Alconox, Liquinox, Tergazyme, Alcojet, Alcotabs, Detojet, Detergent 8, Citranox, Luminox, Citrajet, Solujet, and Tergajet
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