To determine relative concentration of Hotel cleaning solutions.
Date Run:
05/19/2000
Experiment Procedure:
Samples of each cleaning solution were collected from the client’s staff by SCL. The products collected were from the supply used during actual cleaning. The client samples were to be compared to the products SCL received from the vendor. Titrations were tested for nonionic surfactant content using Bama Chem Nonionic Surfactant Kit.
The general procedure is as follows:
1. ADD APPROXIMATELY 25 ML OF WATER TO MIXING VIAL
2. ADD 8 DROPS OF INDICATOR SOLUTION TO VIAL. COLOR SHOULD BE GREEN.
3. ADD 15 DROPS OF 20% SULFURIC ACID TO VIAL (20 DROPS IF STRONGLY ALKALINE DETERGENTS ARE TESTED) AND SWIRL. COLOR SHOULD NOW BE PURPLE. (CAUTION: HANDLE THIS SOLUTION WITH CARE. IT IS CORROSIVE AND MAY CAUSE BURNS.)
4. ADD 0.5ML OF NONIONIC DETERGENT SOLUTION TO VIAL AND SWIRL, COLOR SHOULD NOW TURN BACK TO GREEN OR YELLOW-GREEN. 5. ADD TITRATING SOLUTION DROP WISE WHILE COUNTING UNTIL THE COLOR CHANGES TO A WINE-RED OR PURPLE. (ABOUT HALFWAY TO THE ENDPOINT THE COLOR WILL BE TAN OR LIGHT BROWN). NOTE THE NUMBER OF DROPS NEEDED AND MULTIPLY BY 0.5 TO GET % BY VOLUME OF NONIONIC DETERGENT. EACH DROP IS EQUIVALENT TO 0.0028 GRAMS OF SURFACTANT.
The chemistries used were:
COMPANY PRODUCT
Rochester Midland Tough Job
Rochester Midland Wash Room & Fixture Rochester Midland Glass Cleaner
SUBSTRATE MATERIAL: Liquid CONTAMINANTS: None
Trial Results:
The concentrations of all three products were higher for the mixtures obtained from the Lenox. The Copley products were roughly at the same concentration as the lab samples. Table 1 lists the results from the surfactant testing for the three products.
Table 1. Nonionic Surfactant Testing
Source
SCL
Lenox
Copley
Mfr
Rochester Midland
Rochester Midland
Rochester Midland
Product
Tough Job
Tough Job
Tough Job
Conc. %
6.25
33
7.75
Volume
5
1
5
Wt of Surf
0.0812
0.0868
0.1008
% Surf.
1.45
7.75
1.8
Total Surf % 23.2
23.485
23.226
Mfr
Rochester Midland
Rochester Midland
Rochester Midland
Product
Washroom & Fixture
Washroom & Fixture
Washroom & Fixture
Conc. %
3.125
6
1.25
Volume
25
10
40
Wt of Surf
0.0476
0.0364
0.0308
% Surf.
0.17
0.325
0.06875
Total Surf % 5.44
5.417
5.5
Mfr
Rochester Midland
Rochester Midland
Rochester Midland
Product
Glass Cleaner
Glass Cleaner
Glass Cleaner
Conc. %
Not Supplied
3.13
2.25
Volume
30
30
Wt of Surf
0.1092
0.0784
% Surf.
0.325
0.233
Total Surf %
10.4
10.37
Success Rating:
A cleanliness study, addressing only various analytical techniques.
Conclusion:
The Lenox products evaluated were found to be more concentrated than the Copley samples. The Copley samples were determined to closely match the recommended low end concentrations of the laboratory diluted samples.
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