To determine a method for evaluating soil loading of cleaning solutions.
Date Run:
08/16/1999
Experiment Procedure:
Seven standards were made using DI water and Evanol in 100 ml beakers. Concentration of the Evanol was based on volume percent. The standards used were: 0, 1, 5, 10, 25, 50 and 100%. A LaMotte’s Smart Colorimeter was used to evaluate the standards using several tests. The general test procedure was first to zero the instrument using the blank (DI water). A second DI water sample was read to establish the 0% standard (blank). The other standards were measured and values were recorded. The vial was rinsed in between each standard in order to ensure accurate readings. Using the recorded values, the data was plotted and analyzed using statistical methods available in Microsoft Excel. From the calculated relationships, the methods with the correlations closest to the ideal value of 1 will be selected for further evaluation.
For each method tested, the seven standards were used to establish a relationship between the level of Evanol present in solution to the amount displayed using the colorimeter. Of the seven methods tested, three had correlations near 1. The Chlorine test had the highest r-value, 0.9987 followed by Nitrate-N, 0.9945 and Oxygen with an r-value of 0.9931. Tabe 1. Lists all of the correlation values for each method evaluated.
Table 1. Correlations (r) for Each Analysis Method
Log est of Data
Lin est of LN of Data
H2O2
Nitrate-N
Chlorine
Oxygen
User Test #1
0.971
0.971
0.9916
0.9945
0.9987
0.9931
0.987
*Ideal r = 1
The data calculated from the derived formula’s were compared to the actual data in graphical form. Figures 1 -7 relates the actual and calculated values for each method.
Success Rating:
A cleanliness study, addressing only various analytical techniques.
Conclusion:
Three methods tested showed possible relationships that could be used to evaluate soil loading in the cleaning solutions. Next phase of Project 2 will be to make up cleaning solutions with known amounts of contaminant added to them and evaluating the three methods using the colorimeter and linking the relationship with cleaning efficiencies.
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