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Trial Number 10

Client Number 108

Project Number 1

Trial Purpose:

To determine if the addition of bleach would effect the chlorine readings.

Date Run:

09/14/1999

Experiment Procedure:

Two methods were used to verify the effects of bleach. The first method used Micro 90 at 2% and Evanol at 5% by volume solutions. Six 80 ml beakers were filled with the cleaner and contaminant solution. Different amounts of bleach were added to each solution. Colorimeter readings were made and compared to the each other. The volumes of bleach used were: 0 ml, 3 drops, 1 ml, 2 ml, 3 ml, 8 ml. The other method used varying amounts of Evanol mixed with the Micro 90. Initial colorimeter readings were made and recorded. Bleach was added to these standards 1 ml at a time. After each addition of bleach, colorimeter readings were made. The amount of Evanol used were: 5%, 10% and 15%.

SUBSTRATE MATERIAL: Liquid
CONTAMINANTS: DuPont Evanol (Vinyl Alcohol Polymers & Copolymers CAS#s: 9002-89-5, 25213-24-5, 54626-91-4; Methanol Bulk/Packaged CAS #: 67-56-1; Sodium Acetate CAS#: 127-09-3)
CONTAMINATING PROCESS USED: DI water added to known amounts of the contaminant

Trial Results:

Both tests showed that the addition of the bleach did not effect the chlorine readings for the Cleaner/Contaminant mix. Table 1 lists the results from the constant Evanol samples and Table 2 lists the results of the different standards.

Table 1. Evanol 5% with Bleach

Bleach Vol 3 drops 1 mL 2 mL 3mL 8mL
Chlorine Level 0.02 0.02 0.02 0.02 0.02

Table 2.  Multiple Evanol Percents with Bleach

  Bleach Vol
Evanol %  0 mL 1 mL 2 mL 3mL
0 0 NT NT NT
5 0.05 0.05 0.03 0.05
10 0.09 0.11 0.1 0.1
15 0.13 0.14 0.14 0.14

Success Rating:

A cleanliness study, addressing only various analytical techniques.

Conclusion:

The addition of bleach to the sample solutions did not effect the chlorine readings made with the colorimeter.

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